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Reentrant Softening in Copper-Oxide Superconductors

Published online by Cambridge University Press:  28 February 2011

C. E. Violet ,
T. Datta ,
H. M. Ledbetter ,
C. Almasan  and
J. Estrada
C. E. Violet
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
T. Datta
Affiliation:
Dept. Physics and Astronomy, U. South Carolina, Columbia, S.C. 29208
H. M. Ledbetter
Affiliation:
Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
C. Almasan
Affiliation:
Dept. Physics and Astronomy, U. South Carolina, Columbia, S.C. 29208
J. Estrada
Affiliation:
Dept. Physics and Astronomy, U. South Carolina, Columbia, S.C. 29208
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Abstract

On the basis of our reentrant-softening model, sound-velocity results in La1.85Sr0.15CuO4 and YBa2Cu3O7−x are shown to be neither dissimilar nor inconsistent with thermodynamic requirements. In both materials, as temperature decreases, the lattice softens just above Tc. Below Tc, this softening is offset by increased stiffness associated with the developing superconducting phase. This model agrees with results from other physical-property measurements, and it predicts that elastic stiffness is higher in the normal state than in the superconducting state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 375
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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