Three-dimensional fluctuation conductivity in superconducting single crystal K3C60 and Rb3C60

X. D. Xiang, J. G. Hou, Vincent Henry Crespi, A. Zettl, Marvin L. Cohen

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The superconducting transition temperature, C, defines the point at which the free energies of the superconducting and normal states of a material become equal. Just above C, thermodynamic fluctuations produce small, transient regions of the superconducting state, giving rise to an anomalous increase in the normal-state conductivity known as paraconductivity. This situation is analogous to the fluctuating regions of correlated spins found near the Curie-Weiss transition in ferromagnets. Such fluctuations are of theoretical significance in that they provide a direct probe of critical phenomena in general, and a stringent test of scaling theories, which describe the approach to the critical point. Paraconductivity effects are strongly dependent on the dimensionality of the system, although for conventional superconductors, three-dimensional fluctuation conductivity has to our knowledge never been observed. Here we report the observation of pure, three-dimensional paraconductivity in single crystals of the recently discoveredsuperconductors Kand Rb In addition to probing the critical state near c, these measurements allow the indirect determination of the residual, normal-state resistivity.

Original languageEnglish (US)
Pages (from-to)54-56
Number of pages3
JournalNature
Volume361
Issue number6407
DOIs
StatePublished - Jan 1 1993

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conductivity
single crystals
critical point
transition temperature
free energy
scaling
thermodynamics
electrical resistivity
probes

All Science Journal Classification (ASJC) codes

  • General

Cite this

Xiang, X. D. ; Hou, J. G. ; Crespi, Vincent Henry ; Zettl, A. ; Cohen, Marvin L. / Three-dimensional fluctuation conductivity in superconducting single crystal K3C60 and Rb3C60 In: Nature. 1993 ; Vol. 361, No. 6407. pp. 54-56.
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Three-dimensional fluctuation conductivity in superconducting single crystal K3C60 and Rb3C60 . / Xiang, X. D.; Hou, J. G.; Crespi, Vincent Henry; Zettl, A.; Cohen, Marvin L.

In: Nature, Vol. 361, No. 6407, 01.01.1993, p. 54-56.

Research output: Contribution to journalArticle

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AU - Xiang, X. D.

AU - Hou, J. G.

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AB - The superconducting transition temperature, C, defines the point at which the free energies of the superconducting and normal states of a material become equal. Just above C, thermodynamic fluctuations produce small, transient regions of the superconducting state, giving rise to an anomalous increase in the normal-state conductivity known as paraconductivity. This situation is analogous to the fluctuating regions of correlated spins found near the Curie-Weiss transition in ferromagnets. Such fluctuations are of theoretical significance in that they provide a direct probe of critical phenomena in general, and a stringent test of scaling theories, which describe the approach to the critical point. Paraconductivity effects are strongly dependent on the dimensionality of the system, although for conventional superconductors, three-dimensional fluctuation conductivity has to our knowledge never been observed. Here we report the observation of pure, three-dimensional paraconductivity in single crystals of the recently discoveredsuperconductors Kand Rb In addition to probing the critical state near c, these measurements allow the indirect determination of the residual, normal-state resistivity.

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