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Shear-modulus change below Tc in YBa2Cu3O7−x

Published online by Cambridge University Press:  31 January 2011

H. M. Ledbetter,
M. W. Austin,
S. A. Kim,
T. Datta and
C. E. Violet
H. M. Ledbetter
Affiliation:
Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
M. W. Austin
Affiliation:
Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
S. A. Kim
Affiliation:
Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
T. Datta
Affiliation:
Department of Physics, University of South Carolina, Columbia, South Carolina 29208
C. E. Violet
Affiliation:
Lawrence Livermore National Laboratory, Liuermore, California 94550
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Abstract

The ultrasonic transverse-wave velocity in the high-Tc metal-oxide superconductor YBa2Cu3O7−x between 275 and 4 K was measured. Above Tc the velocity shows normal behavior: during cooling, it displays a monotonic increase with decreasing slope. During cooling below Tc the shear modulus departs from normal behavior, increasing as ΔG /G = b [1 − (T/Tc)n, where n = 3. These results depart dramatically from those expected for a simple second-order normal-superconducting phase transition.

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Articles
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Journal of Materials Research , Volume 2 , Issue 6 , December 1987, pp. 790 - 792
Copyright
Copyright © Materials Research Society 1987

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References

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