High-Tc superconductivity in three-fluorite-layer copper oxides. I. (Hg,W)Sr2(Ce,Eu)3Cu2O11+δ
T. Watanabe, M. Karppinen, T. Motohashi, T. Nagai, Y. Matsui, H. Yamauchi
DOI 10.1103/PhysRevB.70.174514 · Physical Review B
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Abstract
A (Hg,W)-1232-phase copper oxide has been synthesized in an essentially single-phase form with the composition of (Hg0.7W0.3)Sr2(Ce0.58Eu0.42)3Cu2O11+δ, through high-pressure synthesis at 5GPa and 1100°C. The (Hg,W)-1232 phase contains a three-layer fluorite-structured block between adjacent CuO2 planes. The crystal structure was confirmed by x-ray diffiaction, high-resolution transmission-electron microscopy, and electron diffraction. In contrast to the previously known three-fluorite-layer copper-oxide phases, perfect diamagnetism with a large Meissner volume fraction was revealed for this (Hg,W)-1232 phase. The superconductivity transition temperature Tc was found at 33K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Hg0.7W0.3)Sr2(Ce0.58Eu0.42)3Cu2O11+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | onset |
| (Hg0.7W0.3)Sr2(Ce0.58Eu0.42)3Cu2O11+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | midpoint |
| (Hg0.75W0.25)Sr2(Ce0.25Gd0.75)2Cu2Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | unknown |
| (Hg0.7W0.3)Sr2(Ce0.67Eu0.33)3Cu2O11+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
| (Hg0.7W0.3)Sr2(Ce0.5Eu0.5)3Cu2O11+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | onset |
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