期刊
PHYSICAL REVIEW B
卷 89, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.134502
关键词
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资金
- Canadian Institute for Advanced Research
- Canada Research Chair
- NSERC
- FRQNT
- CFI
- National Natural Science Foundation of China [11190021]
- Chinese Academy of Sciences
- National Basic Research Program of China
- Ontario Ministry of Research and Innovation
- Canada Research Chair program
- National Research Council Canada
- Canadian Institutes of Health Research
- Government of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
We report a sudden reversal in the pressure dependence of T-c in the iron-based superconductor CsFe2As2, similar to that discovered recently in KFe2As2 [Tafti et al., Nat. Phys. 9, 349 (2013)]. As in KFe2As2, we observe no change in the Hall coefficient at T -> 0, again ruling out a Lifshitz transition across the critical pressure P-c. We interpret the T-c reversal in the two materials as a phase transition from one pairing state to another, tuned by pressure, and we investigate which parameters control this transition. Comparing samples of different residual resistivity rho(0), we find that a sixfold increase in impurity scattering does not shift P-c. From a study of x-ray diffraction on KFe2As2 under pressure, we report the pressure dependence of lattice constants and As-Fe-As bond angle. The pressure dependence of the various lattice parameters suggests that P-c should be significantly higher in CsFe2As2 than in KFe2As2, but we find on the contrary that P-c is lower in CsFe2As2, indicating that other factors control T-c. Resistivity measurements under pressure reveal a change of regime across P-c, suggesting a possible link between inelastic scattering and pairing symmetry.
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