Suppression of the superconducting transition temperature Tc around x∼0.115 in La2−xSrxCuO4
M. Maki, M. Sera, M. Hiroi, N. Kobayashi
DOI 10.1103/PhysRevB.53.11324 · Physical Review B
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Abstract
Detailed studies of the superconducting diamagnetism of La2−x−yNdySrxCuO4 show that the characteristic concentration xdip at which the largest Tc suppression is observed changes from 0.115 to 0.125 on Nd doping around y∼0.12, above which the structural transition to the low-temperature tetragonal (LTT) phase is observed. This indicates that also in La2−xSrxCuO4, the xdip value is, in principle, also 1/8 as in La2−xBaxCuO4. We propose that the largest Tc suppression around x∼0.115 in La2−xSrxCuO4 is the result of the existence of two competitive factors. One is the local distortion expanding the LTT region around the Sr2+ ion, which is largest at x=1/8 and acts to suppress Tc. The other is the antiferromagnetic spin fluctuation energy, which might increase with x and acts to increase Tc. On Nd doping, the former factor becomes larger around x=0.125 than around x=0.115 and the xdip value moves to 0.125. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-x-yNdySrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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