Absence of superconductivity in the collapsed tetragonal phase of KFe2As2 under hydrostatic pressure
Bosen Wang, Kazuyuki Matsubayashi, Jinguang Cheng, Taichi Terashima, Kunihiro Kihou, Shigeyuki Ishida, Chul-Ho Lee, Akira Iyo, Hiroshi Eisaki, Yoshiya Uwatoko
DOI 10.1103/PhysRevB.94.020502 · Physical Review B
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Abstract
Temperature dependence of resistivity on KFe2As2 single crystals down to 20 mK was measured under various hydrostatic pressures up to 17.5 GPa generated in a cubic-anvil cell. With increasing the pressure, the superconducting transition of tetragonal KFe2As2 was suppressed gradually and disappears completely at ∼11 GPa, which was related to the weakening of electronic correlations and/or critical fluctuations under pressure. In sharp contrast to previous reports, no superconducting phase emerges upon further increasing pressures until the collapsed tetragonal KFe2As2 forms. We argue that such a discrepancy can be attributed to the different pressure apparatus or homogeneity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure unresolved | zero_resistance |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.3 | 1.9 GPa | zero_resistance |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | 16 GPa | onset |
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