Emergence of two superconducting phases (33 K and 40 K) and their relation to structural phase transitions in crystalline La2CuO4.011
Tôru Kyômen, Masaharu Oguni, Mitsuru Itoh, Jian Ding Yu
DOI 10.1103/PhysRevB.51.3181 · Physical Review B
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Abstract
Adiabatic calorimetry revealed three structural phase transitions existing in La2CuO4.011 single crystal; the higher-order type at 287 K, the Martensitic type at 265 K, and the first-order type at 222 K. The phase stable between 222 and 265 K can be supercooled easily and shows superconductivity with onset at 33 K, while the phase stable below 222 K does that at 40 K. The annealing effects on the structural phase transitions are discussed in correlation with different appearances of the superconducting transition temperature and of the Meissner fraction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4.011 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | onset |
| La2CuO4.011 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| La2CuO4.032 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | unknown |
| La2CuO4.032 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | unknown |
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