Structural phase transformations and superconductivity in La2−xBaxCuO4
J. D. Axe, A. H. Moudden, D. Hohlwein, D. E. Cox, K. M. Mohanty, A. R. Moodenbaugh, Youwen Xu
DOI 10.1103/PhysRevLett.62.2751 · Physical Review Letters
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Abstract
La2−xBaxCuO4 has been found to undergo the following sequence of transformations upon cooling: tetr.(I4/mmm) →ortho.(Bmab)→tetr.(P42/ncm), over a range of composition 0.05<x<0.20. The newly discovered low-temperature tetragonal phase can be thought of as a coherent superposition of the twin-related Bmab structures. The system can be modeled as an XY-spin system with temperature-dependent quartic anisotopy, v(T). Slight differences between orthorhombic and tetragonal structures appear to have large effects upon the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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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