Complete elastic constants and giant softening of c66 in superconducting La1.86Sr0.14CuO4

A. Migliori; William M. Visscher; S. Wong; S. E. Brown; I. Tanaka; H. Kojima; P. B. Allen

doi:10.1103/PhysRevLett.64.2458

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Complete elastic constants and giant softening of c66 in superconducting La1.86Sr0.14CuO4

A. Migliori, William M. Visscher, S. Wong, S. E. Brown, I. Tanaka, H. Kojima, P. B. Allen

DOI 10.1103/PhysRevLett.64.2458 · Physical Review Letters

T1

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Abstract

A novel resonant ultrasound technique is used to measure all elastic constants and their temperature dependence in single-crystal La1.86Sr0.14CuO4. The in-plane shear modulus c66 drops by nearly half upon cooling to 227 K, an effect attributed to order-parameter fluctuations (of 2D Gaussian character) near the tetragonal-orthorhombic phase boundary. Implications for current models of the structural phase transition are discussed, as well as the effect of domains in the low-temperature orthorhombic state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.86Sr0.14CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36	Pressure not reported	onset
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown