Superconductivity in the Sr-Ca-Cu-O system and the phase with infinite-layer structure
H. Shaked, Y. Shimakawa, B. A. Hunter, R. L. Hitterman, J. D. Jorgensen, P. D. Han, D. A. Payne
DOI 10.1103/PhysRevB.51.11784 · Physical Review B
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Abstract
Superconductivity and structure in samples of (Sr,Ca)CuO2 with the infinite-layer structure, prepared by high-pressure synthesis, have been studied using magnetic susceptibility measurements, small angle x-ray diffraction, and neutron diffraction. It is found that the superconducting (Tc∼100 K) samples in this system are phase impure and contain, in addition to the infinite-layer phase, members of the two homologous series Srn−1Cun+1O2n (n=3,5,...; orthorhombic), and Srn+1CunO2n+1+δ (n=1,2,...; tetragonal), as minor phases. Samples with larger phase fractions of the Srn+1CunO2n+1+δ compounds showed higher superconducting fractions. Phase-pure infinite-layer samples are not superconducting. Based on these results, and results previously published in the literature, it is proposed that the superconductivity in these infinite-layer samples comes from the tetragonal Srn+1CunO2n+1+δ compounds, not from the phase with the infinite-layer structure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Sr0.7Ca0.3)yCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | unknown |
| (Ba0.2Sr0.8)yCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| (Sr0.7Ca0.3)yCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | 5.7 GPa | onset |
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