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Title: Strain-Driven Approach to Quantum Criticality in AFe2As2 with A=K, Rb, and Cs

Abstract

The iron-based superconductors AFe2As2 with A = K, Rb, Cs exhibit large Sommerfeld coefficients approaching those of heavy-fermion systems. We have investigated the magnetostriction and thermal expansion of this series to shed light on this unusual behavior. Quantum oscillations of the magnetostriction allow identifying the band-specific quasiparticle masses which by far exceed the band-structure derived masses. The divergence of the Grüneisen ratio derived from thermal expansion indicates that with increasing volume along the series a quantum critical point is approached. In conclusion, the critical fluctuations responsible for the enhancement of the quasiparticle masses appear to weaken the superconducting state.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3]; ORCiD logo [4];  [5];  [6];  [7]
+ Show Author Affiliations
  1. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. fur Technologie
  2. Karlsruher Institut fur Technologie, Germany
  3. Renmin Univ. of China, Beijing (China). Dept. of Physics
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
  6. Univ. of Tokyo (Japan). Dept. of Advanced Materials Science; Kyoto Univ. (Japan). Dept. of Physics
  7. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. fur Technologie; Karlsruhe Inst. of Technology (KIT) (Germany). Physikalisches Inst.
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Science Foundation of China
OSTI Identifier:
1414118
Alternate Identifier(s):
OSTI ID: 1256164
Report Number(s):
LA-UR-15-28161
Journal ID: ISSN 0031-9007; TRN: US1800644
Grant/Contract Number:  
AC52-06NA25396; 11374361; C-1411; PHY-1066293
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science

Citation Formats

Eilers, Felix, Grube, Kai, Zocco, Diego A., Wolf, Thomas, Merz, Michael, Schweiss, Peter, Heid, Rolf, Eder, Robert, Yu, Rong, Zhu, Jianxin, Si, Qimiao, Shibauchi, Takasada, and Lohneysen, Hilbert v. Strain-Driven Approach to Quantum Criticality in AFe2As2 with A=K, Rb, and Cs. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.237003.
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Eilers, Felix, Grube, Kai, Zocco, Diego A., Wolf, Thomas, Merz, Michael, Schweiss, Peter, Heid, Rolf, Eder, Robert, Yu, Rong, Zhu, Jianxin, Si, Qimiao, Shibauchi, Takasada, & Lohneysen, Hilbert v. Strain-Driven Approach to Quantum Criticality in AFe2As2 with A=K, Rb, and Cs. United States. https://doi.org/10.1103/PhysRevLett.116.237003
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Eilers, Felix, Grube, Kai, Zocco, Diego A., Wolf, Thomas, Merz, Michael, Schweiss, Peter, Heid, Rolf, Eder, Robert, Yu, Rong, Zhu, Jianxin, Si, Qimiao, Shibauchi, Takasada, and Lohneysen, Hilbert v. Wed . "Strain-Driven Approach to Quantum Criticality in AFe2As2 with A=K, Rb, and Cs". United States. https://doi.org/10.1103/PhysRevLett.116.237003. https://www.osti.gov/servlets/purl/1414118.
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@article{osti_1414118,
title = {Strain-Driven Approach to Quantum Criticality in AFe2As2 with A=K, Rb, and Cs},
author = {Eilers, Felix and Grube, Kai and Zocco, Diego A. and Wolf, Thomas and Merz, Michael and Schweiss, Peter and Heid, Rolf and Eder, Robert and Yu, Rong and Zhu, Jianxin and Si, Qimiao and Shibauchi, Takasada and Lohneysen, Hilbert v.},
abstractNote = {The iron-based superconductors AFe2As2 with A = K, Rb, Cs exhibit large Sommerfeld coefficients approaching those of heavy-fermion systems. We have investigated the magnetostriction and thermal expansion of this series to shed light on this unusual behavior. Quantum oscillations of the magnetostriction allow identifying the band-specific quasiparticle masses which by far exceed the band-structure derived masses. The divergence of the Grüneisen ratio derived from thermal expansion indicates that with increasing volume along the series a quantum critical point is approached. In conclusion, the critical fluctuations responsible for the enhancement of the quasiparticle masses appear to weaken the superconducting state.},
doi = {10.1103/PhysRevLett.116.237003},
journal = {Physical Review Letters},
number = 23,
volume = 116,
place = {United States},
year = {Wed Jun 08 00:00:00 EDT 2016},
month = {Wed Jun 08 00:00:00 EDT 2016}
}
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https://doi.org/10.1103/PhysRevLett.116.237003
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Works referenced in this record:

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Nodal gap in iron-based superconductor CsFe 2 As 2 probed by quasiparticle heat transport
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Selective Mott Physics as a Key to Iron Superconductors
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    Works referencing / citing this record:

    Evidence of nematic order and nodal superconducting gap along [110] direction in RbFe2As2
    journal, March 2019

    Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xPx)2
    journal, November 2019

    Novel electronic nematicity in heavily hole-doped iron pnictide superconductors
    journal, March 2020

    • Ishida, Kousuke; Tsujii, Masaya; Hosoi, Suguru
    • Proceedings of the National Academy of Sciences, Vol. 117, Issue 12
    • DOI: 10.1073/pnas.1909172117

    Putative hybridization gap in CaMn 2 Bi 2 under applied pressure
    journal, July 2019

    Broken mirror symmetry, incommensurate spin correlations, and B 2 g nematic order in iron pnictides
    journal, September 2019

    Strong correlations, strong coupling, and s -wave superconductivity in hole-doped BaFe 2 As 2 single crystals
    journal, November 2016

    Non-trivial role of interlayer cation states in iron-based superconductors
    text, January 2016

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