Superconducting to spin-glass state transformation in β-pyrochlore KxOs2O6
C. C. Lee, W. L. Lee, J. -Y. Lin, C. C. Tsuei, J. G. Lin, F. C. Chou
DOI 10.1103/PhysRevB.83.104503 · Physical Review B
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Abstract
β-pyrochore KOs2O6, which shows superconductivity below ~9.7 K, has been converted into KxOs2O6 (x≲23–12) electrochemically to show spin-glass-like behavior below ~6.1 K. A room-temperature sample surface potential versus charge transfer scan indicates that there are at least two two-phase regions for x between 1 and 0.5. A rattling model of superconductivity for the title compound has been examined using electrochemical potassium de-intercalation. The significant reduction of superconducting volume fraction due to minor potassium reduction suggests the importance of defect and phase coherence in the rattling model. Magnetic susceptibility, resistivity, and specific heat measurement results have been compared between the superconducting and spin-glass-like samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | unknown |
| KxOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | unknown |
| KxOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | unknown |
| KxOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | unknown |
| KxOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | unknown |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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