Structural instability in single crystals of the high-Tc superconductor La2−x Srx CuO4

Urs Geiser; Mark A. Beno; Arthur J. Schultz; Hau H. Wang; Thomas J. Allen; Marilyn R. Monaghan; Jack M. Williams

doi:10.1103/PhysRevB.35.6721

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Structural instability in single crystals of the high-Tc superconductor La2−x Srx CuO4

Urs Geiser, Mark A. Beno, Arthur J. Schultz, Hau H. Wang, Thomas J. Allen, Marilyn R. Monaghan, Jack M. Williams

DOI 10.1103/PhysRevB.35.6721 · Physical Review B

T1

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Abstract

Single crystals superconducting La2−xSrxCuO4 (x∼0.08) have been investigated in the temperature range 15–298 K and are found to undergo a structural phase transition below room temperature, but above 180 K. Detailed analysis of the diffraction-peak profiles obtained below the transition temperature indicates a breakup of the macroscopic crystals into multiple domains of different orientations. Several cooling and warming cycles always reverse the samples into one-domain single crystals at room temperature. Complicated peak profiles prevent the determination of the exact symmetry and structure below the phase transition.

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.	8.75	Pressure not reported	unknown
La1.85Sro.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown