Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor

Mou, Daixiang; Jiang, Rui; Taufour, Valentin; Bud'ko, S. L.; Canfield, P. C.; Kaminski, Adam

doi:10.1103/PhysRevB.91.214519

Title: Momentum dependence of the superconducting gap and in-gap states in ${MgB}_{2}$ multiband superconductor

Abstract

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 this excitation, ~ 3 meV, was found to be somewhat larger than the previously reported gap on π Fermi sheet and therefore we cannot exclude the possibility of interband scattering as its origin.

Authors:

Mou, Daixiang ^[1]; Jiang, Rui ^[1]; Taufour, Valentin ^[1]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Kaminski, Adam ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Mon Jun 29 00:00:00 EDT 2015

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1227380

Alternate Identifier(s):: OSTI ID: 1198619

Report Number(s):: IS-J-8675
Journal ID: ISSN 1098-0121; PRBMDO

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

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

Additional Journal Information:: Journal Volume: 91; Journal Issue: 21; 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, Bud'ko, S. L., Canfield, P. C., and Kaminski, Adam. Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.91.214519.

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                    Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Bud'ko, S. L., Canfield, P. C., & Kaminski, Adam. Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor.  United States.  https://doi.org/10.1103/PhysRevB.91.214519

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                    Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Bud'ko, S. L., Canfield, P. C., and Kaminski, Adam. Mon .  
"Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor".  United States.  https://doi.org/10.1103/PhysRevB.91.214519.  https://www.osti.gov/servlets/purl/1227380.

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@article{osti_1227380,

  title        = {Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor},

  author       = {Mou, Daixiang and Jiang, Rui and Taufour, Valentin and Bud'ko, S. L. and Canfield, P. C. and Kaminski, Adam},

  abstractNote = {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 kF of the σ band that occur at some locations of the sample surface. As a result, the energy of this excitation, ~ 3 meV, was found to be somewhat larger than the previously reported gap on π Fermi sheet and therefore we cannot exclude the possibility of interband scattering as its origin.},

  doi          = {10.1103/PhysRevB.91.214519},

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

  number       = 21,

  volume       = 91,

  place        = {United States},

  year         = {Mon Jun 29 00:00:00 EDT 2015},

  month        = {Mon Jun 29 00:00:00 EDT 2015}

}

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Works referenced in this record:

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Works referencing / citing this record:

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

Kim, Hyunsoo; Cho, Kyuil; Tanatar, Makariy A.
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Two-gap and three-gap superconductivity in ${AlB}_{2}$ -based films
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Zhao, Yinchang; Lian, Chao; Zeng, Shuming
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Observation of topological surface states in the high-temperature superconductor MgB2
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Zhou, Xiaoqing; Gordon, Kyle N.; Jin, Kyung-Hwan
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Title: Momentum dependence of the superconducting gap and in-gap states in MgB 2 multiband superconductor

Abstract

Citation Formats

Superconductivity at 39 K in magnesium diboride journal, March 2001

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

Evidence for a Multiple Superconducting Gap in MgB 2 from High-Resolution Photoemission Spectroscopy journal, October 2001

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

Imaging the effects of individual zinc impurity atoms on superconductivity in Bi2Sr2CaCu2O8+δ journal, February 2000

Superconductivity in lanthanum nickel boro-nitride journal, November 1994

A Hartree-Fock Theory of Transition-Metal Impurities in a Superconductor journal, July 1973

Superconductivity at 18 K in potassium-doped C60 journal, April 1991

The complex nature of superconductivity in MgB2 as revealed by the reduced total isotope effect journal, May 2001

Magnesium Diboride: Better Late than Never journal, March 2003

Probing the Local Effects of Magnetic Impurities on Superconductivity journal, March 1997

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates journal, March 2007

In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy journal, November 2013

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

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

Knight Shift in Superconductors journal, October 1959

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

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides journal, October 2010

Superconductivity in iron compounds journal, December 2011

Bardeen-Cooper-Schrieffer Theory of Superconductivity in the Case of Overlapping Bands journal, December 1959

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

Two-Gap State Density in MgB 2 : A True Bulk Property Or A Proximity Effect? journal, October 2001

Two-Band Superconductivity in M g B 2 journal, October 2002

Evidence for Two Superconducting Gaps in MgB 2 journal, September 2001

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

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

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

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

Phenomenology of the low-energy spectral function in high- T c superconductors journal, May 1998

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

Strong interaction between electrons and collective excitations in the multiband superconductor MgB 2 journal, April 2015

Classical Spins in Superconductors journal, September 1968

Impurity-induced states in conventional and unconventional superconductors journal, May 2006

Spin-resolved spectra of Shiba multiplets from Mn impurities in MgB 2 journal, May 2008

Observation of Momentum-Confined In-Gap Impurity State in Ba 0.6 K 0.4 Fe 2 As 2 : Evidence for Antiphase s ± Pairing journal, July 2014

A Hartree-Fock Theory of Transition-Metal Impurities in a Superconductor journal, November 1973

Evidence for Two Superconducting Gaps in MgB2 text, January 2001

Evidence for a Multiple Superconducting Gap in MgB2 from High-Resolution Photoemission Spectroscopy text, January 2001

Two-Gap State Density in MgB2: A True Bulk Property Or A Proximity Effect? text, January 2001

Spin-resolved spectra of Shiba multiplets from Mn impurities in MgB_2 text, January 2008

Superconductivity in Iron Compounds text, January 2011

Strong interaction between electrons and collective excitations in multiband superconductor MgB2 text, January 2015

Definitive experimental evidence for two-band superconductivity in MgB2 text, January 2003

Determination of the Fermi Surface of MgB$_2$ by the de Haas-van Alphen effect text, January 2003

BCS-like Bogoliubov Quasiparticles in High-Tc Superconductors Observed by Angle-Resolved Photoemission Spectroscopy text, January 2003

Impurity-induced states in conventional and unconventional superconductors preprint, January 2004

Characterization of high-quality MgB2(0001) epitaxial films on Mg(0001) text, January 2005

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates text, January 2007

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

Two-gap and three-gap superconductivity in AlB 2 -based films journal, September 2019

Observation of topological surface states in the high-temperature superconductor MgB2 text, January 2019

Title: Momentum dependence of the superconducting gap and in-gap states in ${MgB}_{2}$ multiband superconductor

Superconductivity at 39 K in magnesium diboride
journal, March 2001

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

Evidence for a Multiple Superconducting Gap in ${MgB}_{2}$ from High-Resolution Photoemission Spectroscopy
journal, October 2001

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

Imaging the effects of individual zinc impurity atoms on superconductivity in Bi2Sr2CaCu2O8+δ
journal, February 2000

Superconductivity in lanthanum nickel boro-nitride
journal, November 1994

A Hartree-Fock Theory of Transition-Metal Impurities in a Superconductor
journal, July 1973

Superconductivity at 18 K in potassium-doped C60
journal, April 1991

The complex nature of superconductivity in MgB2 as revealed by the reduced total isotope effect
journal, May 2001

Magnesium Diboride: Better Late than Never
journal, March 2003

Probing the Local Effects of Magnetic Impurities on Superconductivity
journal, March 1997

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
journal, March 2007

In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy
journal, November 2013

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

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

Knight Shift in Superconductors
journal, October 1959

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

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010

Superconductivity in iron compounds
journal, December 2011

Bardeen-Cooper-Schrieffer Theory of Superconductivity in the Case of Overlapping Bands
journal, December 1959

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

Two-Gap State Density in ${MgB}_{2}$ : A True Bulk Property Or A Proximity Effect?
journal, October 2001

Two-Band Superconductivity in ${M g B}_{2}$
journal, October 2002

Evidence for Two Superconducting Gaps in ${MgB}_{2}$
journal, September 2001

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

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

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

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

Phenomenology of the low-energy spectral function in high- $T_{c}$ superconductors
journal, May 1998

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

Strong interaction between electrons and collective excitations in the multiband superconductor ${MgB}_{2}$
journal, April 2015

Classical Spins in Superconductors
journal, September 1968

Impurity-induced states in conventional and unconventional superconductors
journal, May 2006

Spin-resolved spectra of Shiba multiplets from Mn impurities in ${MgB}_{2}$
journal, May 2008

Observation of Momentum-Confined In-Gap Impurity State in ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$ : Evidence for Antiphase $s_{\pm}$ Pairing
journal, July 2014

A Hartree-Fock Theory of Transition-Metal Impurities in a Superconductor
journal, November 1973

Evidence for Two Superconducting Gaps in MgB2
text, January 2001

Evidence for a Multiple Superconducting Gap in MgB2 from High-Resolution Photoemission Spectroscopy
text, January 2001

Two-Gap State Density in MgB2: A True Bulk Property Or A Proximity Effect?
text, January 2001

Spin-resolved spectra of Shiba multiplets from Mn impurities in MgB_2
text, January 2008

Superconductivity in Iron Compounds
text, January 2011

Strong interaction between electrons and collective excitations in multiband superconductor MgB2
text, January 2015

Definitive experimental evidence for two-band superconductivity in MgB2
text, January 2003

Determination of the Fermi Surface of MgB$_2$ by the de Haas-van Alphen effect
text, January 2003

BCS-like Bogoliubov Quasiparticles in High-Tc Superconductors Observed by Angle-Resolved Photoemission Spectroscopy
text, January 2003

Impurity-induced states in conventional and unconventional superconductors
preprint, January 2004

Characterization of high-quality MgB2(0001) epitaxial films on Mg(0001)
text, January 2005

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
text, January 2007

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

Two-gap and three-gap superconductivity in ${AlB}_{2}$ -based films
journal, September 2019

Observation of topological surface states in the high-temperature superconductor MgB2
text, January 2019