Disappearance of superconductivity in overdoped La2−xSrxCuO4 at a structural phase boundary
H. Takagi, R. J. Cava, M. Marezio, B. Batlogg, J. J. Krajewski, W. F. Peck, Jr., P. Bordet, D. E. Cox
DOI 10.1103/PhysRevLett.68.3777 · Physical Review Letters
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Abstract
The electronic and structural phase diagram of heavily doped La2−xSrxCuO4 (0.15≤x≤0.3) is reexamined. We demonstrate that the disappearance of superconductivity in ‘‘overdoped’’ La2−xSrxCuO4 is associated with an orthorhombic to tetragonal structural phase transition near x=0.2, implying a relationship between superconductivity and subtle structural change. The bulk superconducting phase is thus confined to a much narrower composition range than believed. A complete solid solution of La and Sr is observed in the composition range investigated.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | onset |
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