Elastic anomalies and phase transitions in high-Tc superconductors

Ultrasound propagation in both known classes of high-Tc ceramic superconductors reveals the presence of an anomaly above Tc, at Ts of about 95 K in La(1.8)Sr(0.2)CuO(4-y) and at about 120 K in YBa2Cu3O(7-delta), suggesting that the state between Ts and Tc is the 'normal' state preceding su...

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Published in:Physical review letters 1988-03, Vol.60 (12), p.1181-1184
Main Authors: Bhattacharya, S, Higgins, MJ, Johnston, DC, Jacobson, AJ, Stokes, JP, Goshorn, DP, Lewandowski, JT
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container_issue 12
container_start_page 1181
container_title Physical review letters
container_volume 60
creator Bhattacharya, S
Higgins, MJ
Johnston, DC
Jacobson, AJ
Stokes, JP
Goshorn, DP
Lewandowski, JT
description Ultrasound propagation in both known classes of high-Tc ceramic superconductors reveals the presence of an anomaly above Tc, at Ts of about 95 K in La(1.8)Sr(0.2)CuO(4-y) and at about 120 K in YBa2Cu3O(7-delta), suggesting that the state between Ts and Tc is the 'normal' state preceding superconductivity. The anomalous elastic behavior at and below Tc is dominated by the shear modulus and not by the bulk modulus, implying an unusually strong coupling of the order parameter to shear distortions. Implications of these results for superconductivity are discussed. (Author)
doi_str_mv 10.1103/PhysRevLett.60.1181
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title Elastic anomalies and phase transitions in high-Tc superconductors
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