Enhanced ultrasonic attenuation of Tl-Ca-Ba-Cu-O at the superconducting transition

K. J. Sun; W. P. Winfree; M-F. Xu; M. Levy; Bimal K. Sarma; A. K. Singh; M. S. Osofsky; V. M. Le Tourneau

doi:10.1103/PhysRevB.42.2569

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Enhanced ultrasonic attenuation of Tl-Ca-Ba-Cu-O at the superconducting transition

K. J. Sun, W. P. Winfree, M-F. Xu, M. Levy, Bimal K. Sarma, A. K. Singh, M. S. Osofsky, V. M. Le Tourneau

DOI 10.1103/PhysRevB.42.2569 · Physical Review B

T1

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Abstract

Temperature-dependent ultrasonic attenuation measurements have been performed on polycrystalline samples of Tl-Ca-Ba-Cu-O at various frequencies. An attenuation anomaly was observed close to the superconducting transition temperature Tc (103 K) whose temperature position was frequency independent. The attenuation decreased exponentially with temperature in the superconducting state for both transverse and longitudinal waves. It was also found that the temperature-dependent sound velocity showed a slope change around Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown