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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]
  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 Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); 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.
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. doi:10.1103/PhysRevLett.116.237003.
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. doi:10.1103/PhysRevLett.116.237003. https://www.osti.gov/servlets/purl/1414118.
@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 = {2016},
month = {6}
}

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    Works referencing / citing this record:

    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
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