T* phase (Bi0.5Sr1.5)(Y2−xCex)Cu2O8−δ superconductors: The effect of ionic radius on structure
X. H. Chen, H. Chen, H. Zhang, C. Y. Wong, Z. J. Chen, L. Z. Cao, G. E. Zhou, Y. H. Zhang
DOI 10.1103/PhysRevB.49.1492 · Physical Review B
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Abstract
We have successfully synthesized the superconductor (Sr1.5Bi0.5)(Y2−xCex)Cu2O8−δ, the crystal structure of which is similar to that of T*-phase (Nd,Sr,Ce)2CuO4. This structure is also believed to be without the double Bi-O layer as in Bi2Sr2(L,Ce)2Cu2Oy, and the coupling between layers in (Sr,Bi)2(Y,Ce)2Cu2O8−δ is stronger than in Bi2Sr2(L,Ce)2Cu2Oy. The transition temperature is actually increased by about 8 K. This result seems to be different from that in Tl-based superconductors. It is also found that the ionic radius of the A site in the Cu perovskite unit ACuO3−δ is critical to the formation of the T, T’, T* phases.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Bi0.5Sr1.5)(Y1.15Ce0.85)Cu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| (Bi0.5Sr1.5)(Y1.15Ce0.85)Cu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | zero_resistance |
| (Bi0.5Sr1.5)(Y1.15Ce0.85)Cu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | unknown |
| (Nd,Ce,Sr)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
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