Strong interaction between electrons and collective excitations in the multiband superconductor MgB2

Mou, Daixiang; Jiang, Rui; Taufour, Valentin; Flint, Rebecca; Bud'ko, S. L.; Canfield, P. C.; Wen, J. S.; Xu, Z. J.; Gu, Genda; Kaminski, Adam

doi:10.1103/PhysRevB.91.140502

Title: Strong interaction between electrons and collective excitations in the multiband superconductor ${MgB}_{2}$

Abstract

We use a tunable laser angle-resolved photoemission spectroscopy to study the electronic properties of the prototypical multiband BCS superconductor MgB₂. Our data reveal a strong renormalization of the dispersion (kink) at ~65meV, which is caused by the coupling of electrons to the E_2g phonon mode. In contrast to cuprates, the 65 meV kink in MgB₂ does not change significantly across T_c. More interestingly, we observe strong coupling to a second, lower energy collective mode at a binding energy of 10 meV. As a result, this excitation vanishes above T_c and is likely a signature of the elusive Leggett mode.

Authors:

Mou, Daixiang ^[1]; Jiang, Rui ^[1]; Taufour, Valentin ^[1]; Flint, Rebecca ^[1]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Wen, J. S. ^[2]; Xu, Z. J. ^[2]; Gu, Genda ^[2]; Kaminski, Adam ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Wed Apr 08 00:00:00 EDT 2015

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1227294

Alternate Identifier(s):: OSTI ID: 1179364

Report Number(s):: IS-J-8612
Journal ID: ISSN 1098-0121; PRBMDO

Grant/Contract Number:: AC02-07CH11358; AC02-98CH10886

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 91; Journal Issue: 14; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Flint, Rebecca, Bud'ko, S. L., Canfield, P. C., Wen, J. S., Xu, Z. J., Gu, Genda, and Kaminski, Adam. Strong interaction between electrons and collective excitations in the multiband superconductor MgB2.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.91.140502.

Copy to clipboard


                    Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Flint, Rebecca, Bud'ko, S. L., Canfield, P. C., Wen, J. S., Xu, Z. J., Gu, Genda, & Kaminski, Adam. Strong interaction between electrons and collective excitations in the multiband superconductor MgB2.  United States.  https://doi.org/10.1103/PhysRevB.91.140502

Copy to clipboard


                    Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Flint, Rebecca, Bud'ko, S. L., Canfield, P. C., Wen, J. S., Xu, Z. J., Gu, Genda, and Kaminski, Adam. Wed .  
"Strong interaction between electrons and collective excitations in the multiband superconductor MgB2".  United States.  https://doi.org/10.1103/PhysRevB.91.140502.  https://www.osti.gov/servlets/purl/1227294.

Copy to clipboard


                    
@article{osti_1227294,

  title        = {Strong interaction between electrons and collective excitations in the multiband superconductor MgB2},

  author       = {Mou, Daixiang and Jiang, Rui and Taufour, Valentin and Flint, Rebecca and Bud'ko, S. L. and Canfield, P. C. and Wen, J. S. and Xu, Z. J. and Gu, Genda and Kaminski, Adam},

  abstractNote = {We use a tunable laser angle-resolved photoemission spectroscopy to study the electronic properties of the prototypical multiband BCS superconductor MgB2. Our data reveal a strong renormalization of the dispersion (kink) at ~65meV, which is caused by the coupling of electrons to the E2g phonon mode. In contrast to cuprates, the 65 meV kink in MgB2 does not change significantly across Tc. More interestingly, we observe strong coupling to a second, lower energy collective mode at a binding energy of 10 meV. As a result, this excitation vanishes above Tc and is likely a signature of the elusive Leggett mode.},

  doi          = {10.1103/PhysRevB.91.140502},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 14,

  volume       = 91,

  place        = {United States},

  year         = {Wed Apr 08 00:00:00 EDT 2015},

  month        = {Wed Apr 08 00:00:00 EDT 2015}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1103/PhysRevB.91.140502

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 13 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Theory of Superconductivity
journal, December 1957

Bardeen, J.; Cooper, L. N.; Schrieffer, J. R.
Physical Review, Vol. 108, Issue 5
DOI: 10.1103/PhysRev.108.1175

Many-Body Effects in Angle-Resolved Photoemission: Quasiparticle Energy and Lifetime of a Mo(110) Surface State
journal, September 1999

Valla, T.; Fedorov, A. V.; Johnson, P. D.
Physical Review Letters, Vol. 83, Issue 10
DOI: 10.1103/PhysRevLett.83.2085

Unusual Dispersion and Line Shape of the Superconducting State Spectra of ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$
journal, November 1997

Norman, M. R.; Ding, H.; Campuzano, J. C.
Physical Review Letters, Vol. 79, Issue 18
DOI: 10.1103/PhysRevLett.79.3506

Collective modes and the superconducting-state spectral function of ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$
journal, May 1998

Norman, M. R.; Ding, H.
Physical Review B, Vol. 57, Issue 18
DOI: 10.1103/PhysRevB.57.R11089

Electronic Spectra and Their Relation to the $(π, π)$ Collective Mode in High- $T_{c}$ Superconductors
journal, November 1999

Campuzano, J. C.; Ding, H.; Norman, M. R.
Physical Review Letters, Vol. 83, Issue 18
DOI: 10.1103/PhysRevLett.83.3709

Evidence for Quantum Critical Behavior in the Optimally Doped Cuprate Bi2Sr2CaCu2O8+
journal, September 1999

Valla, T.
Science, Vol. 285, Issue 5436
DOI: 10.1126/science.285.5436.2110

Evidence for an Energy Scale for Quasiparticle Dispersion in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$
journal, September 2000

Bogdanov, P. V.; Lanzara, A.; Kellar, S. A.
Physical Review Letters, Vol. 85, Issue 12
DOI: 10.1103/PhysRevLett.85.2581

Renormalization of Spectral Line Shape and Dispersion below $T_{c}$ in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$
journal, February 2001

Kaminski, A.; Randeria, M.; Campuzano, J. C.
Physical Review Letters, Vol. 86, Issue 6
DOI: 10.1103/PhysRevLett.86.1070

Anomalous Doping Variation of the Nodal Low-Energy Feature of Superconducting $(Bi, Pb)_{2} (Sr, La)_{2} {CuO}_{6 + δ}$ Crystals Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
journal, May 2013

Kondo, Takeshi; Nakashima, Y.; Malaeb, W.
Physical Review Letters, Vol. 110, Issue 21
DOI: 10.1103/PhysRevLett.110.217006

Polarized neutron determination of the magnetic excitations in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$
journal, May 1993

Mook, H. A.; Yethiraj, M.; Aeppli, G.
Physical Review Letters, Vol. 70, Issue 22
DOI: 10.1103/PhysRevLett.70.3490

Neutron scattering from magnetic excitations in Bi2Sr2CaCu2O8+δ
journal, April 1999

Fong, H. F.; Bourges, P.; Sidis, Y.
Nature, Vol. 398, Issue 6728
DOI: 10.1038/19255

Coupling of the $B_{1 g}$ Phonon to the Antinodal Electronic States of ${B i}_{2} {S r}_{2} {C a}_{0.92} Y_{0.08} {C u}_{2} O_{8 + δ}$
journal, September 2004

Cuk, T.; Baumberger, F.; Lu, D. H.
Physical Review Letters, Vol. 93, Issue 11
DOI: 10.1103/PhysRevLett.93.117003

Anisotropic Electron-Phonon Interaction in the Cuprates
journal, September 2004

Devereaux, T. P.; Cuk, T.; Shen, Z. -X.
Physical Review Letters, Vol. 93, Issue 11
DOI: 10.1103/PhysRevLett.93.117004

Doping Dependence of the Coupling of Electrons to Bosonic Modes in the Single-Layer High-Temperature ${Bi}_{2} {Sr}_{2} {CuO}_{6}$ Superconductor
journal, April 2006

Meevasana, W.; Ingle, N. J. C.; Lu, D. H.
Physical Review Letters, Vol. 96, Issue 15
DOI: 10.1103/PhysRevLett.96.157003

Gaps and kinks in the electronic structure of the superconductor $2 H$ -NbSe $_{2}$ from angle-resolved photoemission at 1 K
journal, June 2012

Rahn, D. J.; Hellmann, S.; Kalläne, M.
Physical Review B, Vol. 85, Issue 22
DOI: 10.1103/PhysRevB.85.224532

Superconductivity at 39 K in magnesium diboride
journal, March 2001

Nagamatsu, Jun; Nakagawa, Norimasa; Muranaka, Takahiro
Nature, Vol. 410, Issue 6824
DOI: 10.1038/35065039

Boron Isotope Effect in Superconducting ${MgB}_{2}$
journal, February 2001

Bud'ko, S. L.; Lapertot, G.; Petrovic, C.
Physical Review Letters, Vol. 86, Issue 9
DOI: 10.1103/PhysRevLett.86.1877

Superconductivity of Metallic Boron in ${MgB}_{2}$
journal, May 2001

Kortus, J.; Mazin, I. I.; Belashchenko, K. D.
Physical Review Letters, Vol. 86, Issue 20
DOI: 10.1103/PhysRevLett.86.4656

Superconductivity of ${MgB}_{2}$ : Covalent Bonds Driven Metallic
journal, May 2001

An, J. M.; Pickett, W. E.
Physical Review Letters, Vol. 86, Issue 19
DOI: 10.1103/PhysRevLett.86.4366

Beyond Eliashberg Superconductivity in ${MgB}_{2}$ : Anharmonicity, Two-Phonon Scattering, and Multiple Gaps
journal, August 2001

Liu, Amy Y.; Mazin, I. I.; Kortus, Jens
Physical Review Letters, Vol. 87, Issue 8
DOI: 10.1103/PhysRevLett.87.087005

The origin of the anomalous superconducting properties of MgB2
journal, August 2002

Choi, Hyoung Joon; Roundy, David; Sun, Hong
Nature, Vol. 418, Issue 6899
DOI: 10.1038/nature00898

The origin of multiple superconducting gaps in MgB2
journal, May 2003

Souma, S.; Machida, Y.; Sato, T.
Nature, Vol. 423, Issue 6935
DOI: 10.1038/nature01619

Electronic Structure of ${MgB}_{2}$ from Angle-Resolved Photoemission Spectroscopy
journal, April 2002

Uchiyama, H.; Shen, K. M.; Lee, S.
Physical Review Letters, Vol. 88, Issue 15
DOI: 10.1103/PhysRevLett.88.157002

Definitive Experimental Evidence for Two-Band Superconductivity in ${M g B}_{2}$
journal, September 2003

Tsuda, S.; Yokoya, T.; Takano, Y.
Physical Review Letters, Vol. 91, Issue 12
DOI: 10.1103/PhysRevLett.91.127001

Evidence for Two Superconducting Energy Gaps in ${MgB}_{2}$ by Point-Contact Spectroscopy
journal, September 2001

Szabó, P.; Samuely, P.; Kačmarčík, J.
Physical Review Letters, Vol. 87, Issue 13
DOI: 10.1103/PhysRevLett.87.137005

Phonon Density of States in ${MgB}_{2}$
journal, June 2001

Osborn, R.; Goremychkin, E. A.; Kolesnikov, A. I.
Physical Review Letters, Vol. 87, Issue 1
DOI: 10.1103/PhysRevLett.87.017005

Superconducting Gap in ${MgB}_{2}$ : Electronic Raman Scattering Measurements of Single Crystals
journal, February 2002

Quilty, J. W.; Lee, S.; Yamamoto, A.
Physical Review Letters, Vol. 88, Issue 8
DOI: 10.1103/PhysRevLett.88.087001

Number-Phase Fluctuations in Two-Band Superconductors
journal, November 1966

Leggett, A. J.
Progress of Theoretical Physics, Vol. 36, Issue 5
DOI: 10.1143/PTP.36.901

Josephson effects between multigap and single-gap superconductors
journal, December 2002

Agterberg, D. F.; Demler, Eugene; Janko, B.
Physical Review B, Vol. 66, Issue 21
DOI: 10.1103/PhysRevB.66.214507

MgB2 tunnel junctions and SQUIDs
journal, June 2007

Brinkman, A.; Rowell, J. M.
Physica C: Superconductivity, Vol. 456, Issue 1-2
DOI: 10.1016/j.physc.2007.01.019

Leggett’s mode in Mg1−x AlxB2
journal, March 2007

Ponomarev, Ya. G.; Kuzmichev, S. A.; Mikheev, M. G.
JETP Letters, Vol. 85, Issue 1
DOI: 10.1134/S0021364007010092

Observation of Leggett’s Collective Mode in a Multiband ${MgB}_{2}$ Superconductor
journal, November 2007

Blumberg, G.; Mialitsin, A.; Dennis, B. S.
Physical Review Letters, Vol. 99, Issue 22
DOI: 10.1103/PhysRevLett.99.227002

Theory of Raman scattering from Leggett’s collective mode in a multiband superconductor: Application to ${MgB}_{2}$
journal, July 2010

Klein, M. V.
Physical Review B, Vol. 82, Issue 1
DOI: 10.1103/PhysRevB.82.014507

Leggett mode in a strong-coupling model of iron arsenide superconductors
journal, October 2010

Burnell, F. J.; Hu, Jiangping; Parish, Meera M.
Physical Review B, Vol. 82, Issue 14
DOI: 10.1103/PhysRevB.82.144506

Massless Leggett Mode in Three-Band Superconductors with Time-Reversal-Symmetry Breaking
journal, April 2012

Lin, Shi-Zeng; Hu, Xiao
Physical Review Letters, Vol. 108, Issue 17
DOI: 10.1103/PhysRevLett.108.177005

Leggett modes in iron-based superconductors as a probe of time-reversal symmetry breaking
journal, December 2013

Marciani, M.; Fanfarillo, L.; Castellani, C.
Physical Review B, Vol. 88, Issue 21
DOI: 10.1103/PhysRevB.88.214508

Single crystals of MgB2: Synthesis, substitutions and properties
journal, June 2007

Karpinski, J.; Zhigadlo, N. D.; Katrych, S.
Physica C: Superconductivity, Vol. 456, Issue 1-2
DOI: 10.1016/j.physc.2007.01.031

Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy
journal, March 2014

Jiang, Rui; Mou, Daixiang; Wu, Yun
Review of Scientific Instruments, Vol. 85, Issue 3, Article No. 033902
DOI: 10.1063/1.4867517

Characterization of high-quality MgB ₂ (0001) epitaxial films on Mg(0001)
journal, January 2006

Petaccia, Luca; Cepek, Cinzia; Lizzit, Silvano
New Journal of Physics, Vol. 8
DOI: 10.1088/1367-2630/8/1/012

de Haas–van Alphen Effect in Single Crystal ${MgB}_{2}$
journal, May 2002

Yelland, E. A.; Cooper, J. R.; Carrington, A.
Physical Review Letters, Vol. 88, Issue 21
DOI: 10.1103/PhysRevLett.88.217002

Determination of the Fermi Surface of ${M g B}_{2}$ by the de Haas–van Alphen Effect
journal, July 2003

Carrington, A.; Meeson, P. J.; Cooper, J. R.
Physical Review Letters, Vol. 91, Issue 3
DOI: 10.1103/PhysRevLett.91.037003

Anharmonicity and self-energy effects of the $E_{2 g}$ phonon in $Mg B_{2}$
journal, January 2007

Mialitsin, A.; Dennis, B. S.; Zhigadlo, N. D.
Physical Review B, Vol. 75, Issue 2
DOI: 10.1103/PhysRevB.75.020509

Electronic structure, electron–phonon coupling, and multiband effects in MgB2
journal, March 2003

Mazin, I. I.; Antropov, V. P.
Physica C: Superconductivity, Vol. 385, Issue 1-2
DOI: 10.1016/S0921-4534(02)02299-2

BCS-Like Bogoliubov Quasiparticles in High- $T_{c}$ Superconductors Observed by Angle-Resolved Photoemission Spectroscopy
journal, May 2003

Matsui, H.; Sato, T.; Takahashi, T.
Physical Review Letters, Vol. 90, Issue 21
DOI: 10.1103/PhysRevLett.90.217002

Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission
journal, June 1996

Campuzano, J. C.; Ding, H.; Norman, M. R.
Physical Review B, Vol. 53, Issue 22
DOI: 10.1103/PhysRevB.53.R14737

Superconductivity in ${M g B}_{2}$ : Clean or Dirty?
journal, August 2002

Mazin, I. I.; Andersen, O. K.; Jepsen, O.
Physical Review Letters, Vol. 89, Issue 10
DOI: 10.1103/PhysRevLett.89.107002

Works referencing / citing this record:

Collective modes in a two-band superfluid of ultracold alkaline-earth-metal atoms close to an orbital Feshbach resonance
journal, April 2017

Zhang, Yi-Cai; Ding, Shanshan; Zhang, Shizhong
Physical Review A, Vol. 95, Issue 4
DOI: 10.1103/physreva.95.041603

Spectroscopic fingerprints of many-body renormalization in $1 T − {TiSe}_{2}$
journal, July 2019

Zhao, J.; Lee, Kyungmin; Li, J.
Physical Review B, Vol. 100, Issue 4
DOI: 10.1103/physrevb.100.045106

Self-Consistent Two-Gap Description of MgB2 Superconductor
journal, August 2019

Kim, Hyunsoo; Cho, Kyuil; Tanatar, Makariy A.
Symmetry, Vol. 11, Issue 8
DOI: 10.3390/sym11081012

Similar Records in DOE PAGES and OSTI.GOV collections:

Isotope effect on electron-phonon interaction in the multiband superconductor ${MgB}_{2}$

Journal Article Mou, Daixiang ; Manni, Soham ; Taufour, Valentin ; ... - Physical Review B

We investigate the effect of isotope substitution on the electron-phonon interaction in the multiband superconductor MgB₂ using tunable laser-based angle-resolved photoemission spectroscopy. The kink structure around 70 meV in the σ band, which is caused by electron coupling to the E_2g phonon mode, is shifted to higher binding energy by ~3.5 meV in Mg¹⁰B₂ and the shift is not affected by superconducting transition. Furthermore, these results serve as the benchmark for investigations of isotope effects in known, unconventional superconductors and newly discovered superconductors where the origin of pairing is unknown.
Cited by 6
https://doi.org/10.1103/PhysRevB.93.144504

Full Text Available
Momentum dependence of the superconducting gap and in-gap states in ${MgB}_{2}$ multiband superconductor

Journal Article Mou, Daixiang ; Jiang, Rui ; Taufour, Valentin ; ... - Physical Review. B, Condensed Matter and Materials Physics

We use tunable laser-based angle-resolved photoemission spectroscopy to study the electronic structure of the multiband superconductor MgB₂. These results form the baseline for detailed studies of superconductivity in multiband systems. We find that the magnitude of the superconducting gap on both σ bands follows a BCS-like variation with temperature with Δ₀ ~ 7meV. Furthermore, the value of the gap is isotropic within experimental uncertainty and in agreement with a pure s-wave pairing symmetry. We observe in-gap states confined to k_F of the σ band that occur at some locations of the sample surface. As a result, the energy of thismore »« less
Cited by 20
https://doi.org/10.1103/PhysRevB.91.214519

Full Text Available
Anomalous phonon behavior in superconducting ${CaKFe}_{4} {As}_{4}$ : An optical study

Journal Article Yang, Run ; Dai, Yaomin ; Xu, Bing ; ... - Physical Review B

Here, the temperature dependence of ab-plane optical conductivity of CaKFe₄As₄ has been measured below and above its superconducting transition temperature T_c≃35.5 K. In the normal state, analysis with the two-Drude model reveals a T-linear scattering rate for the coherent response, which suggests strong spin-fluctuation scattering. Below the superconducting transition, the optical conductivity below 120 cm^–1 vanishes, indicating nodeless gap(s). The Mattis-Bardeen fitting in the superconducting state gives two gaps of Δ₁ ≃ 9 meV and Δ₂ ≃ 14 meV, in good agreement with recent angle-resolved photoemission spectroscopy (ARPES) results. In addition, around 255 cm^–1, we observe two different infrared-active Fe-Asmore »« less
Cited by 24
https://doi.org/10.1103/PhysRevB.95.064506

Full Text Available
Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor ${Sr}_{0.67} {Na}_{0.33} {Fe}_{2} {As}_{2}$

Journal Article Yang, R. ; Huang, J. W. ; Zaki, N. ; ... - Physical Review B

We repormore »« less
Cited by 3
https://doi.org/10.1103/PhysRevB.100.235132

Full Text Available
Electrical and thermal transport in van der Waals magnets $2 H − M_{x} {TaS}_{2} (M = Mn, Co)$

Journal Article Liu, Yu ; Hu, Zhixiang ; Tong, Xiao ; ... - Physical Review Research

We report a detailed study of electrical and thermal transport properties in 2H-M_x TaS₂ (M = Mn, Co) magnets where M atoms are intercalated in the van der Waals gap. The intercalation induces ferromagnetism (FM) with an easy-plane anisotropy in 2H-M_x TaS₂, but FM with a strong uniaxial anisotropy in 2H-Co_0.22TaS₂, which finally evolves into a three-dimensional antiferromagnetism (AFM) in 2H-Co_0.34TaS₂. Temperature-dependent electrical resistivity shows metallic behavior for all samples. Thermopower is negative in the whole temperature range for 2H-Co_xTaS₂, whereas the sign changes from negative to positive with increasing Mn for 2H-Mn_x TaS₂. The diffusive thermoelectric response dominates inmore »« less
https://doi.org/10.1103/PhysRevResearch.4.013048

Similar Records

Title: Strong interaction between electrons and collective excitations in the multiband superconductor MgB 2

Abstract

Citation Formats

Theory of Superconductivity journal, December 1957

Many-Body Effects in Angle-Resolved Photoemission: Quasiparticle Energy and Lifetime of a Mo(110) Surface State journal, September 1999

Unusual Dispersion and Line Shape of the Superconducting State Spectra of Bi 2 Sr 2 CaCu 2 O 8 + δ journal, November 1997

Collective modes and the superconducting-state spectral function of Bi 2 Sr 2 CaCu 2 O 8 journal, May 1998

Electronic Spectra and Their Relation to the ( π , π ) Collective Mode in High- T c Superconductors journal, November 1999

Evidence for Quantum Critical Behavior in the Optimally Doped Cuprate Bi2Sr2CaCu2O8+ journal, September 1999

Evidence for an Energy Scale for Quasiparticle Dispersion in Bi 2 Sr 2 CaCu 2 O 8 journal, September 2000

Renormalization of Spectral Line Shape and Dispersion below T c in Bi 2 Sr 2 CaCu 2 O 8 + δ journal, February 2001

Anomalous Doping Variation of the Nodal Low-Energy Feature of Superconducting ( Bi , Pb ) 2 ( Sr , La ) 2 CuO 6 + δ Crystals Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy journal, May 2013

Polarized neutron determination of the magnetic excitations in YBa 2 Cu 3 O 7 journal, May 1993

Neutron scattering from magnetic excitations in Bi2Sr2CaCu2O8+δ journal, April 1999

Coupling of the B 1 g Phonon to the Antinodal Electronic States of B i 2 S r 2 C a 0.92 Y 0.08 C u 2 O 8 + δ journal, September 2004

Anisotropic Electron-Phonon Interaction in the Cuprates journal, September 2004

Doping Dependence of the Coupling of Electrons to Bosonic Modes in the Single-Layer High-Temperature Bi 2 Sr 2 CuO 6 Superconductor journal, April 2006

Gaps and kinks in the electronic structure of the superconductor 2 H -NbSe 2 from angle-resolved photoemission at 1 K journal, June 2012

Superconductivity at 39 K in magnesium diboride journal, March 2001

Boron Isotope Effect in Superconducting MgB 2 journal, February 2001

Superconductivity of Metallic Boron in MgB 2 journal, May 2001

Superconductivity of MgB 2 : Covalent Bonds Driven Metallic journal, May 2001

Beyond Eliashberg Superconductivity in MgB 2 : Anharmonicity, Two-Phonon Scattering, and Multiple Gaps journal, August 2001

The origin of the anomalous superconducting properties of MgB2 journal, August 2002

The origin of multiple superconducting gaps in MgB2 journal, May 2003

Electronic Structure of MgB 2 from Angle-Resolved Photoemission Spectroscopy journal, April 2002

Definitive Experimental Evidence for Two-Band Superconductivity in M g B 2 journal, September 2003

Evidence for Two Superconducting Energy Gaps in MgB 2 by Point-Contact Spectroscopy journal, September 2001

Phonon Density of States in MgB 2 journal, June 2001

Superconducting Gap in MgB 2 : Electronic Raman Scattering Measurements of Single Crystals journal, February 2002

Number-Phase Fluctuations in Two-Band Superconductors journal, November 1966

Josephson effects between multigap and single-gap superconductors journal, December 2002

MgB2 tunnel junctions and SQUIDs journal, June 2007

Leggett’s mode in Mg1−x AlxB2 journal, March 2007

Observation of Leggett’s Collective Mode in a Multiband MgB 2 Superconductor journal, November 2007

Theory of Raman scattering from Leggett’s collective mode in a multiband superconductor: Application to MgB 2 journal, July 2010

Leggett mode in a strong-coupling model of iron arsenide superconductors journal, October 2010

Massless Leggett Mode in Three-Band Superconductors with Time-Reversal-Symmetry Breaking journal, April 2012

Leggett modes in iron-based superconductors as a probe of time-reversal symmetry breaking journal, December 2013

Single crystals of MgB2: Synthesis, substitutions and properties journal, June 2007

Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy journal, March 2014

Characterization of high-quality MgB 2 (0001) epitaxial films on Mg(0001) journal, January 2006

de Haas–van Alphen Effect in Single Crystal MgB 2 journal, May 2002

Determination of the Fermi Surface of M g B 2 by the de Haas–van Alphen Effect journal, July 2003

Anharmonicity and self-energy effects of the E 2 g phonon in Mg B 2 journal, January 2007

Electronic structure, electron–phonon coupling, and multiband effects in MgB2 journal, March 2003

BCS-Like Bogoliubov Quasiparticles in High- T c Superconductors Observed by Angle-Resolved Photoemission Spectroscopy journal, May 2003

Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission journal, June 1996

Superconductivity in M g B 2 : Clean or Dirty? journal, August 2002

Collective modes in a two-band superfluid of ultracold alkaline-earth-metal atoms close to an orbital Feshbach resonance journal, April 2017

Spectroscopic fingerprints of many-body renormalization in 1 T − TiSe 2 journal, July 2019

Self-Consistent Two-Gap Description of MgB2 Superconductor journal, August 2019

Title: Strong interaction between electrons and collective excitations in the multiband superconductor ${MgB}_{2}$

Theory of Superconductivity
journal, December 1957

Many-Body Effects in Angle-Resolved Photoemission: Quasiparticle Energy and Lifetime of a Mo(110) Surface State
journal, September 1999

Unusual Dispersion and Line Shape of the Superconducting State Spectra of ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$
journal, November 1997

Collective modes and the superconducting-state spectral function of ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$
journal, May 1998

Electronic Spectra and Their Relation to the $(π, π)$ Collective Mode in High- $T_{c}$ Superconductors
journal, November 1999

Evidence for Quantum Critical Behavior in the Optimally Doped Cuprate Bi2Sr2CaCu2O8+
journal, September 1999

Evidence for an Energy Scale for Quasiparticle Dispersion in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$
journal, September 2000

Renormalization of Spectral Line Shape and Dispersion below $T_{c}$ in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$
journal, February 2001

Anomalous Doping Variation of the Nodal Low-Energy Feature of Superconducting $(Bi, Pb)_{2} (Sr, La)_{2} {CuO}_{6 + δ}$ Crystals Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
journal, May 2013

Polarized neutron determination of the magnetic excitations in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$
journal, May 1993

Neutron scattering from magnetic excitations in Bi2Sr2CaCu2O8+δ
journal, April 1999

Coupling of the $B_{1 g}$ Phonon to the Antinodal Electronic States of ${B i}_{2} {S r}_{2} {C a}_{0.92} Y_{0.08} {C u}_{2} O_{8 + δ}$
journal, September 2004

Anisotropic Electron-Phonon Interaction in the Cuprates
journal, September 2004

Doping Dependence of the Coupling of Electrons to Bosonic Modes in the Single-Layer High-Temperature ${Bi}_{2} {Sr}_{2} {CuO}_{6}$ Superconductor
journal, April 2006

Gaps and kinks in the electronic structure of the superconductor $2 H$ -NbSe $_{2}$ from angle-resolved photoemission at 1 K
journal, June 2012

Superconductivity at 39 K in magnesium diboride
journal, March 2001

Boron Isotope Effect in Superconducting ${MgB}_{2}$
journal, February 2001

Superconductivity of Metallic Boron in ${MgB}_{2}$
journal, May 2001

Superconductivity of ${MgB}_{2}$ : Covalent Bonds Driven Metallic
journal, May 2001

Beyond Eliashberg Superconductivity in ${MgB}_{2}$ : Anharmonicity, Two-Phonon Scattering, and Multiple Gaps
journal, August 2001

The origin of the anomalous superconducting properties of MgB2
journal, August 2002

The origin of multiple superconducting gaps in MgB2
journal, May 2003

Electronic Structure of ${MgB}_{2}$ from Angle-Resolved Photoemission Spectroscopy
journal, April 2002

Definitive Experimental Evidence for Two-Band Superconductivity in ${M g B}_{2}$
journal, September 2003

Evidence for Two Superconducting Energy Gaps in ${MgB}_{2}$ by Point-Contact Spectroscopy
journal, September 2001

Phonon Density of States in ${MgB}_{2}$
journal, June 2001

Superconducting Gap in ${MgB}_{2}$ : Electronic Raman Scattering Measurements of Single Crystals
journal, February 2002

Number-Phase Fluctuations in Two-Band Superconductors
journal, November 1966

Josephson effects between multigap and single-gap superconductors
journal, December 2002

MgB2 tunnel junctions and SQUIDs
journal, June 2007

Leggett’s mode in Mg1−x AlxB2
journal, March 2007

Observation of Leggett’s Collective Mode in a Multiband ${MgB}_{2}$ Superconductor
journal, November 2007

Theory of Raman scattering from Leggett’s collective mode in a multiband superconductor: Application to ${MgB}_{2}$
journal, July 2010

Leggett mode in a strong-coupling model of iron arsenide superconductors
journal, October 2010

Massless Leggett Mode in Three-Band Superconductors with Time-Reversal-Symmetry Breaking
journal, April 2012

Leggett modes in iron-based superconductors as a probe of time-reversal symmetry breaking
journal, December 2013

Single crystals of MgB2: Synthesis, substitutions and properties
journal, June 2007

Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy
journal, March 2014

Characterization of high-quality MgB ₂ (0001) epitaxial films on Mg(0001)
journal, January 2006

de Haas–van Alphen Effect in Single Crystal ${MgB}_{2}$
journal, May 2002

Determination of the Fermi Surface of ${M g B}_{2}$ by the de Haas–van Alphen Effect
journal, July 2003

Anharmonicity and self-energy effects of the $E_{2 g}$ phonon in $Mg B_{2}$
journal, January 2007

Electronic structure, electron–phonon coupling, and multiband effects in MgB2
journal, March 2003

BCS-Like Bogoliubov Quasiparticles in High- $T_{c}$ Superconductors Observed by Angle-Resolved Photoemission Spectroscopy
journal, May 2003

Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission
journal, June 1996

Superconductivity in ${M g B}_{2}$ : Clean or Dirty?
journal, August 2002

Collective modes in a two-band superfluid of ultracold alkaline-earth-metal atoms close to an orbital Feshbach resonance
journal, April 2017

Spectroscopic fingerprints of many-body renormalization in $1 T − {TiSe}_{2}$
journal, July 2019

Self-Consistent Two-Gap Description of MgB2 Superconductor
journal, August 2019