Magnetic field dependence of ultrasound velocity in high-Tc superconductors

M. J. Higgins; D. P. Goshorn; S. Bhattacharya; D. C. Johnston

doi:10.1103/PhysRevB.40.9393

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Magnetic field dependence of ultrasound velocity in high-Tc superconductors

M. J. Higgins, D. P. Goshorn, S. Bhattacharya, D. C. Johnston

DOI 10.1103/PhysRevB.40.9393 · Physical Review B

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Abstract

The magnetic field dependence of ultrasound velocity in the superconductor La1.8Sr0.2CuO4−y is studied. The sound velocity anomaly near Tc is shown to be unambiguously related to superconductivity. Below Tc, the sound velocity is found to be sensitive to the dynamics of a pinned flux lattice. A combination of sound velocity and magnetization measurements suggests three regimes of pinning behavior. A generic pinning ‘‘phase diagram’’ is obtained in the superconducting state. An anomalous peak effect in the magnetization is also observed at intermediate field strengths.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.8Sr0.2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
La1.8Sr0.2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	onset