Local structure of superconducting (La,Sr)2CuO4 under strain: Microscopic mechanism of strain-induced Tc variation

H. Oyanagi; A. Tsukada; M. Naito; N. L. Saini

doi:10.1103/PhysRevB.75.024511

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Local structure of superconducting (La,Sr)2CuO4 under strain: Microscopic mechanism of strain-induced Tc variation

H. Oyanagi, A. Tsukada, M. Naito, N. L. Saini

DOI 10.1103/PhysRevB.75.024511 · Physical Review B

T1

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Abstract

High-quality polarized x-ray absorption spectroscopy data for (La,Sr)2CuO4 thin-film single crystals reveal strain-dependent local disorder (in the oxygen radial distribution) that correlates with the superconducting critical temperature. The temperature-dependent in-plane oxygen displacement shows that local lattice distortion strongly depends on strain, i.e., the biaxial tensile strain develops domains with the bond-stretching-type local distortion which is weakened by the compressive strain. We suggest that the two-dimensional strain modifies electronic inhomogeneity that influences the superconducting critical temperature through superfluid density, rather than band structure effects.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(La,Sr)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43.4	Pressure not reported	unknown
(La,Sr)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	19	Pressure not reported	unknown
(La,Sr)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown