Specific heat of a single crystal of YBa2Cu3O7−δ: Fluctuation effects in a bulk superconductor in zero magnetic field and in a magnetic field

D. M. Ginsberg, S. E. Inderhees, M. B. Salamon, Nigel Goldenfeld, J. P. Rice, B. G. Pazol

Research output: Contribution to journalArticlepeer-review

Abstract

We have measured the specific heat of a single crystal of YBa2Cu3O7−δ. Thermodynamic fluctuations, evident in deviations of the data from a BCS-like step, are well described by 3-dimensional (3D) Gaussian fluctuations. The results imply that the number of components of the order parameter is 7±2. When a magnetic field is applied parallel to the c axis, the specific heat peak broadens and decreases in amplitude, with little shift in position. The difference between the zero field specific heat and that measured in a field is found, however, to satisfy a scaling relation suggesting critical, rather than Gaussian, fluctuations.

Original languageEnglish (US)
Pages (from-to)1082-1085
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume153-155
DOIs
StatePublished - 1988

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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