Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2

doi:10.1080/14786435.2018.1511070

Title: Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu ₂Si ₂ versus YbRh ₂Si ₂

Abstract

In this paper the low-temperature properties of two isostructural canonical heavy-fermion compounds are contrasted with regards to the interplay between antiferromagnetic (AF) quantum criticality and superconductivity. For CeCu ₂Si ₂, fully-gapped d-wave superconductivity forms in the vicinity of an itinerant three-dimensional heavy-fermion spin-density-wave (SDW) quantum critical point (QCP). Inelastic neutron scattering results highlight that both quantum critical SDW fluctuations as well as Mott-type fluctuations of local magnetic moments contribute to the formation of Cooper pairs in CeCu ₂Si ₂. In YbRh ₂Si ₂, superconductivity appears to be suppressed at T ≳10 mK by AF order ( T _N = 70 mK). Ultra-low temperature measurements reveal a hybrid order between nuclear and 4f-electronic spins, which is dominated by the Yb-derived nuclear spins, to develop at T _A slightly above 2 mK. The hybrid order turns out to strongly compete with the primary 4f-electronic order and to push the material towards its QCP. Apparently, this paves the way for heavy-fermion superconductivity to form at T _c = 2 mK. Like the pressure – induced QCP in CeRhIn ₅, the magnetic field – induced one in YbRh ₂Si ₂ is of the local Kondo-destroying variety which corresponds to a Mott-type transition at zeromore »« less

Authors:

Smidman, M. ^[1]; Stockert, O. ^[2]; Arndt, J. ^[2]; Pang, G. M. ^[1]; Jiao, L. ^[3]; Yuan, H. Q. ^[1]; Vieyra, H. A. ^[2]; Kitagawa, S. ^[4]; Ishida, K. ^[4]; Fujiwara, K. ^[5]; Kobayashi, T. C. ^[6]; Schuberth, E. ^[7]; Tippmann, M. ^[8]; Steinke, L. ^[9]; Lausberg, S. ^[2]; Steppke, A. ^[2]; Brando, M. ^[2]; Pfau, H. ^[10]; Stockert, U. ^[2]; Sun, P. ^[11] more »

Zhejiang Univ., Hangzhou (People's Republic of China)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Zhejiang Univ., Hangzhou (People's Republic of China); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Kyoto Univ., Kyoto (Japan)
Shimane Univ., Matsue (Japan)
Okayama Univ., Okayama (Japan)
Bavarian Academy of Sciences, Garching (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Bavarian Academy of Sciences, Garching (Germany)
Texas A & M Univ., College Station, TX (United States); Bavarian Academy of Sciences, Garching (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Chinese Academy of Sciences (CAS), Beijing (China); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Univ. of Bristol, Bristol (United Kingdom); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Univ. of Frankfurt, Frankfurt (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Zhejiang Univ., Hangzhou (People’s Republic of China)
Univ. of British Columbia, Vancouver, BC (Canada); Rice Univ., Houston, TX (United States)
Renmin Univ. of China, Beijing (China); Rice Univ., Houston, TX (United States)
Rice Univ., Houston, TX (United States)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Zhejiang Univ., Hangzhou (People's Republic of China); Chinese Academy of Sciences, Beijing (People's Republic of China)

Publication Date:: 2018-08-20

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1481215

Grant/Contract Number:: AC02-76SF00515; 2016YFA0300202; 2017YFA0303100; 11474251; U1632275; TZ2016004; DMR-1611392; C-1411

Resource Type:: Accepted Manuscript

Journal Name:: Philosophical Magazine (2003, Print)

Additional Journal Information:: Journal Name: Philosophical Magazine (2003, Print); Journal Volume: 98; Journal Issue: 32; Journal ID: ISSN 1478-6435

Publisher:: Taylor & Francis

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; heavy-fermion metals; superconductivity; quantum critical phenomena

Citation Formats


                    Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., and Steglich, Frank. Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2.  United States: N. p., 2018. 
        Web.  doi:10.1080/14786435.2018.1511070.

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                    Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., & Steglich, Frank. Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2.  United States.  doi:10.1080/14786435.2018.1511070.

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                    Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., and Steglich, Frank. Mon .  
        "Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2".  United States.  doi:10.1080/14786435.2018.1511070.  https://www.osti.gov/servlets/purl/1481215.

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@article{osti_1481215,

  title        = {Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2},

  author       = {Smidman, M. and Stockert, O. and Arndt, J. and Pang, G. M. and Jiao, L. and Yuan, H. Q. and Vieyra, H. A. and Kitagawa, S. and Ishida, K. and Fujiwara, K. and Kobayashi, T. C. and Schuberth, E. and Tippmann, M. and Steinke, L. and Lausberg, S. and Steppke, A. and Brando, M. and Pfau, H. and Stockert, U. and Sun, P. and Friedemann, S. and Wirth, S. and Krellner, C. and Kirchner, S. and Nica, E. M. and Yu, R. and Si, Q. and Steglich, Frank},

  abstractNote = {In this paper the low-temperature properties of two isostructural canonical heavy-fermion compounds are contrasted with regards to the interplay between antiferromagnetic (AF) quantum criticality and superconductivity. For CeCu2Si2, fully-gapped d-wave superconductivity forms in the vicinity of an itinerant three-dimensional heavy-fermion spin-density-wave (SDW) quantum critical point (QCP). Inelastic neutron scattering results highlight that both quantum critical SDW fluctuations as well as Mott-type fluctuations of local magnetic moments contribute to the formation of Cooper pairs in CeCu2Si2. In YbRh2Si2, superconductivity appears to be suppressed at T ≳10 mK by AF order (TN = 70 mK). Ultra-low temperature measurements reveal a hybrid order between nuclear and 4f-electronic spins, which is dominated by the Yb-derived nuclear spins, to develop at TA slightly above 2 mK. The hybrid order turns out to strongly compete with the primary 4f-electronic order and to push the material towards its QCP. Apparently, this paves the way for heavy-fermion superconductivity to form at Tc = 2 mK. Like the pressure – induced QCP in CeRhIn5, the magnetic field – induced one in YbRh2Si2 is of the local Kondo-destroying variety which corresponds to a Mott-type transition at zero temperature. Therefore, these materials form the link between the large family of about fifty low-T unconventional heavy – fermion superconductors and other families of unconventional superconductors with higher Tcs, notably the doped Mott insulators of the cuprates, organic charge-transfer salts and some of the Fe-based superconductors. As a result, our study suggests that heavy-fermion superconductivity near an AF QCP is a robust phenomenon.},

  doi          = {10.1080/14786435.2018.1511070},

  journal      = {Philosophical Magazine (2003, Print)},

  number       = 32,

  volume       = 98,

  place        = {United States},

  year         = {2018},

  month        = {8}

}

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Ishida, K.; MacLaughlin, D. E.; Young, Ben-Li
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Interplay between Kondo Suppression and Lifshitz Transitions in ${YbRh}_{2} {Si}_{2}$ at High Magnetic Fields
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Pfau, H.; Daou, R.; Lausberg, S.
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Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion ${CeCu}_{2} {Si}_{2}$
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Takenaka, T.; Mizukami, Y.; Wilcox, J. A.
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Reid, J. -Ph.; Tanatar, M. A.; Daou, R.
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Title: Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu 2Si 2 versus YbRh 2Si 2

Abstract

Citation Formats

CeCu2Si2 and UPt3: Two different cases of heavy fermion superconductivity journal, October 1985

Lattice Disorder Effects on Superconductivity and Electrical Resistivity of Heavy-Fermion CeCu 2 Si 2 -Films journal, April 1987

Hall-effect evolution across a heavy-fermion quantum critical point journal, December 2004

Fermi-surface collapse and dynamical scaling near a quantum-critical point journal, July 2010

A theoretical description of the new phases of liquid He 3 journal, April 1975

Magnetic-Field Induced Quantum Critical Point in Y b R h 2 S i 2 journal, July 2002

CeCu2Si2: Renormalized band structure, quasiparticles and co-operative phenomena journal, May 1993

Magnetic penetration depth in unconventional superconductors journal, June 2006

Non-Fermi-liquid behavior in a heavy-fermion alloy at a magnetic instability journal, May 1994

The effect of collective spin-1 excitations on electronic spectra in high- T c superconductors journal, January 2006

Superconductivity in the Presence of Strong Pauli Paramagnetism: Ce Cu 2 Si 2 journal, December 1979

Superconductivity mediated by spin fluctuations in the heavy-fermion compound UPd2 Al3 journal, March 1999

Intact quasiparticles at an unconventional quantum critical point journal, July 2015

Thermal Conductivity through the Quantum Critical Point in YbRh 2 Si 2 at Very Low Temperature journal, July 2015

Anisotropic Violation of the Wiedemann-Franz Law at a Quantum Critical Point journal, June 2007

Dynamic equilibrium of collective degrees of freedom in strongly correlated quantum matter journal, December 2014

Quantum Criticality and Lifshitz Transition in the Ising System CeRu 2 Si 2 : Comparison with YbRh 2 Si 2 journal, June 2014

Superconductivity and quantum criticality in the heavy-fermion system β-YbAlB4 journal, June 2008

Spin-fluctuation-mediated even-parity pairing in heavy-fermion superconductors journal, November 1986

How do Fermi liquids get heavy and die? journal, August 2001

Evidence of a Kondo Destroying Quantum Critical Point in YbRh 2 Si 2 journal, June 2014

Critical Fields of the "Heavy-Fermion" Superconductor Ce Cu 2 Si 2 journal, November 1982

Nature of the A Phase in CeCu 2 Si 2 journal, April 2004

Fully gapped d -wave superconductivity in CeCu 2 Si 2 journal, May 2018

Influence of Th substitution in the heavy fermion superconductor CeCu2Si2 journal, April 1990

Signatures of valence fluctuations in CeCu 2 Si 2 under high pressure journal, January 2004

Orbital-selective pairing and superconductivity in iron selenides journal, May 2017

Band Dependent Interlayer f -Electron Hybridization in CeRhIn 5 journal, February 2018

Influence of the Crystalline Field on the Kondo Effect of Alloys and Compounds with Cerium Impurities journal, June 1972

Gap Symmetry of the Heavy Fermion Superconductor CeCu 2 Si 2 at Ambient Pressure journal, May 2018

YbRh 2 Si 2 : Pronounced Non-Fermi-Liquid Effects above a Low-Lying Magnetic Phase Transition journal, July 2000

Onset of antiferromagnetism in heavy-fermion metals journal, September 2000

Single-crystal growth of YbRh 2 Si 2 and YbIr 2 Si 2 journal, July 2012

Direct observation of how the heavy-fermion state develops in CeCoIn 5 journal, July 2017

Multiple Energy Scales at a Quantum Critical Point journal, February 2007

Weak magnetism and non-Fermi liquids near heavy-fermion critical points journal, January 2004

Observation of Two Distinct Superconducting Phases in CeCu2Si2 journal, December 2003

Foundations of heavy-fermion superconductivity: lattice Kondo effect and Mott physics journal, July 2016

Magnetic fluctuations above and below Tc in the heavy fermion superconductor UPd2Al3 journal, January 1999

Doping a Mott insulator: Physics of high-temperature superconductivity journal, January 2006

The Quantum Critical Point in CeRhIn 5 : A Resistivity Study journal, November 2008

Superconducting properties of the s ± -wave state: Fe-based superconductors journal, February 2017

Strong correlations make high-temperature superconductors robust against disorder journal, July 2008

Hidden magnetism and quantum criticality in the heavy fermion superconductor CeRhIn5 journal, March 2006

Determination of the gap anisotropyof heavy-fermion superconductors by point contacts journal, December 1994

Heavy-electron superconductors, spin fluctuations, and triplet pairing journal, August 1984

Magnetic order in the different superconducting states of UPt 3 journal, August 1989

Quantum critical phenomena journal, August 1976

A Drastic Change of the Fermi Surface at a Critical Pressure in CeRhIn 5 : dHvA Study under Pressure journal, April 2005

Superconducting gap and vortex lattice of the heavy-fermion compound CeCu 2 Si 2 journal, January 2016

Quasi-particles in heavy fermion systems journal, June 1992

Phonon and Magnetic Neutron Scattering at 41 meV in YB a 2 C u 3 O 7 journal, July 1995

Feedback Spin Resonance in Superconducting CeCu 2 Si 2 and CeCoIn 5 journal, October 2008

Competition between magnetism and superconductivity in CeCu 2 Si 2 journal, July 1997

Anomalous Properties around Magnetic Instability in Heavy Electron Systems journal, March 1995

Structure of neutron-scattering peaks in both s + + -wave and s ± -wave states of an iron pnictide superconductor journal, February 2010

Thermal and electrical transport across a magnetic quantum critical point journal, April 2012

Magnetically driven superconductivity in CeCu2Si2 journal, December 2010

Pairing theory for strongly correlated d -wave superconductors journal, October 2017

Violation of Critical Universality at the Antiferromagnetic Phase Transition of YbRh 2 Si 2 journal, May 2009

Superconductivity of Ce-based heavy fermions under pressure: Valence fluctuation mediated pairing associated with valence instability of Ce journal, January 1999

The break-up of heavy electrons at a quantum critical point journal, July 2003

Kondo destruction in heavy fermion quantum criticality and the photoemission spectrum of YbRh2Si2 journal, February 2016

Verification of the Wiedemann-Franz Law in YbRh 2 Si 2 at a Quantum Critical Point journal, June 2013

Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu 2 Si 2 journal, June 2017

Emergent Loop-Nodal s ± -Wave Superconductivity in CeCu 2 Si 2 : Similarities to the Iron-Based Superconductors journal, April 2015

Magnetic order and superconductivity in single-crystalline journal, March 2006

Emerging local Kondo screening and spatial coherence in the heavy-fermion metal YbRh2Si2 journal, June 2011

Quantum criticality in heavy-fermion metals journal, March 2008

High Pressure NQR Measurement in CeCu 2 Si 2 up to Sudden Disappearance of Superconductivity journal, December 2008

Low-temperature magnetic order and spin dynamics in YbRh 2 Si 2 journal, November 2003

Interplay between Kondo Suppression and Lifshitz Transitions in YbRh 2 Si 2 at High Magnetic Fields journal, June 2013

Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion CeCu 2 Si 2 journal, August 2017

Single-Ion Kondo Scaling of the Coherent Fermi Liquid Regime in Ce 1 − x La x Ni 2 Ge 2 journal, February 2012

Spin Exchange in Superconductors journal, August 1958

Determination of Gap Symmetry from Angle-Dependent H c 2 Measurements on CeCu 2 Si 2 journal, May 2011

Defects in correlated metals and superconductors journal, January 2009

Title: Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu ₂Si ₂ versus YbRh ₂Si ₂

CeCu2Si2 and UPt3: Two different cases of heavy fermion superconductivity
journal, October 1985

Lattice Disorder Effects on Superconductivity and Electrical Resistivity of Heavy-Fermion CeCu ₂ Si ₂ -Films
journal, April 1987

Hall-effect evolution across a heavy-fermion quantum critical point
journal, December 2004

Fermi-surface collapse and dynamical scaling near a quantum-critical point
journal, July 2010

A theoretical description of the new phases of liquid ${}^{3}{He}$
journal, April 1975

Magnetic-Field Induced Quantum Critical Point in $Y b R h_{2} S i_{2}$
journal, July 2002

CeCu2Si2: Renormalized band structure, quasiparticles and co-operative phenomena
journal, May 1993

Magnetic penetration depth in unconventional superconductors
journal, June 2006

Non-Fermi-liquid behavior in a heavy-fermion alloy at a magnetic instability
journal, May 1994

The effect of collective spin-1 excitations on electronic spectra in high- T _c superconductors
journal, January 2006

Superconductivity in the Presence of Strong Pauli Paramagnetism: Ce ${Cu}_{2}$ ${Si}_{2}$
journal, December 1979

Superconductivity mediated by spin fluctuations in the heavy-fermion compound UPd2 Al3
journal, March 1999

Intact quasiparticles at an unconventional quantum critical point
journal, July 2015

Thermal Conductivity through the Quantum Critical Point in ${YbRh}_{2} {Si}_{2}$ at Very Low Temperature
journal, July 2015

Anisotropic Violation of the Wiedemann-Franz Law at a Quantum Critical Point
journal, June 2007

Dynamic equilibrium of collective degrees of freedom in strongly correlated quantum matter
journal, December 2014

Quantum Criticality and Lifshitz Transition in the Ising System CeRu ₂ Si ₂ : Comparison with YbRh ₂ Si ₂
journal, June 2014

Superconductivity and quantum criticality in the heavy-fermion system β-YbAlB4
journal, June 2008

Spin-fluctuation-mediated even-parity pairing in heavy-fermion superconductors
journal, November 1986

How do Fermi liquids get heavy and die?
journal, August 2001

Evidence of a Kondo Destroying Quantum Critical Point in YbRh ₂ Si ₂
journal, June 2014

Critical Fields of the "Heavy-Fermion" Superconductor Ce ${Cu}_{2}$ ${Si}_{2}$
journal, November 1982

Nature of the $A$ Phase in ${CeCu}_{2} {Si}_{2}$
journal, April 2004

Fully gapped d -wave superconductivity in CeCu ₂ Si ₂
journal, May 2018

Influence of Th substitution in the heavy fermion superconductor CeCu2Si2
journal, April 1990

Signatures of valence fluctuations in ${CeCu}_{2} {Si}_{2}$ under high pressure
journal, January 2004

Orbital-selective pairing and superconductivity in iron selenides
journal, May 2017

Band Dependent Interlayer $f$ -Electron Hybridization in ${CeRhIn}_{5}$
journal, February 2018

Influence of the Crystalline Field on the Kondo Effect of Alloys and Compounds with Cerium Impurities
journal, June 1972

Gap Symmetry of the Heavy Fermion Superconductor ${CeCu}_{2} {Si}_{2}$ at Ambient Pressure
journal, May 2018

${YbRh}_{2} {Si}_{2}$ : Pronounced Non-Fermi-Liquid Effects above a Low-Lying Magnetic Phase Transition
journal, July 2000

Onset of antiferromagnetism in heavy-fermion metals
journal, September 2000

Single-crystal growth of YbRh ₂ Si ₂ and YbIr ₂ Si ₂
journal, July 2012

Direct observation of how the heavy-fermion state develops in ${CeCoIn}_{5}$
journal, July 2017

Multiple Energy Scales at a Quantum Critical Point
journal, February 2007

Weak magnetism and non-Fermi liquids near heavy-fermion critical points
journal, January 2004

Observation of Two Distinct Superconducting Phases in CeCu2Si2
journal, December 2003

Foundations of heavy-fermion superconductivity: lattice Kondo effect and Mott physics
journal, July 2016

Magnetic fluctuations above and below Tc in the heavy fermion superconductor UPd2Al3
journal, January 1999

Doping a Mott insulator: Physics of high-temperature superconductivity
journal, January 2006

The Quantum Critical Point in CeRhIn ₅ : A Resistivity Study
journal, November 2008

Superconducting properties of the s ^± -wave state: Fe-based superconductors
journal, February 2017

Strong correlations make high-temperature superconductors robust against disorder
journal, July 2008

Hidden magnetism and quantum criticality in the heavy fermion superconductor CeRhIn5
journal, March 2006

Determination of the gap anisotropyof heavy-fermion superconductors by point contacts
journal, December 1994

Heavy-electron superconductors, spin fluctuations, and triplet pairing
journal, August 1984

Magnetic order in the different superconducting states of ${UPt}_{3}$
journal, August 1989

Quantum critical phenomena
journal, August 1976

A Drastic Change of the Fermi Surface at a Critical Pressure in CeRhIn ₅ : dHvA Study under Pressure
journal, April 2005

Superconducting gap and vortex lattice of the heavy-fermion compound ${CeCu}_{2} {Si}_{2}$
journal, January 2016

Quasi-particles in heavy fermion systems
journal, June 1992

Phonon and Magnetic Neutron Scattering at 41 meV in YB $a_{2}$ C $u_{3}$ $O_{7}$
journal, July 1995

Feedback Spin Resonance in Superconducting ${CeCu}_{2} {Si}_{2}$ and ${CeCoIn}_{5}$
journal, October 2008

Competition between magnetism and superconductivity in ${CeCu}_{2} {Si}_{2}$
journal, July 1997

Anomalous Properties around Magnetic Instability in Heavy Electron Systems
journal, March 1995

Structure of neutron-scattering peaks in both $s_{+ +}$ -wave and $s_{\pm}$ -wave states of an iron pnictide superconductor
journal, February 2010

Thermal and electrical transport across a magnetic quantum critical point
journal, April 2012

Magnetically driven superconductivity in CeCu2Si2
journal, December 2010

Pairing theory for strongly correlated $d$ -wave superconductors
journal, October 2017

Violation of Critical Universality at the Antiferromagnetic Phase Transition of ${YbRh}_{2} {Si}_{2}$
journal, May 2009

Superconductivity of Ce-based heavy fermions under pressure: Valence fluctuation mediated pairing associated with valence instability of Ce
journal, January 1999

The break-up of heavy electrons at a quantum critical point
journal, July 2003

Kondo destruction in heavy fermion quantum criticality and the photoemission spectrum of YbRh2Si2
journal, February 2016

Verification of the Wiedemann-Franz Law in ${YbRh}_{2} {Si}_{2}$ at a Quantum Critical Point
journal, June 2013

Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu ₂ Si ₂
journal, June 2017

Emergent Loop-Nodal $s_{\pm}$ -Wave Superconductivity in ${CeCu}_{2} {Si}_{2}$ : Similarities to the Iron-Based Superconductors
journal, April 2015

Magnetic order and superconductivity in single-crystalline
journal, March 2006

Emerging local Kondo screening and spatial coherence in the heavy-fermion metal YbRh2Si2
journal, June 2011

Quantum criticality in heavy-fermion metals
journal, March 2008

High Pressure NQR Measurement in CeCu ₂ Si ₂ up to Sudden Disappearance of Superconductivity
journal, December 2008

Low-temperature magnetic order and spin dynamics in ${YbRh}_{2} {Si}_{2}$
journal, November 2003

Interplay between Kondo Suppression and Lifshitz Transitions in ${YbRh}_{2} {Si}_{2}$ at High Magnetic Fields
journal, June 2013

Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion ${CeCu}_{2} {Si}_{2}$
journal, August 2017

Single-Ion Kondo Scaling of the Coherent Fermi Liquid Regime in ${Ce}_{1 - x} {La}_{x} {Ni}_{2} {Ge}_{2}$
journal, February 2012

Spin Exchange in Superconductors
journal, August 1958

Determination of Gap Symmetry from Angle-Dependent $H_{c 2}$ Measurements on ${CeCu}_{2} {Si}_{2}$
journal, May 2011

Defects in correlated metals and superconductors
journal, January 2009

Visualizing heavy fermions emerging in a quantum critical Kondo lattice
journal, June 2012

Wiedemann-Franz law and nonvanishing temperature scale across the field-tuned quantum critical point of ${YbRh}_{2}$ ${Si}_{2}$
journal, January 2014