Two-phase regime in the magnetic field-temperature phase diagram of a type-II superconductor

L. L A Adams, Klaus Halterman, Oriol T. Valls, A. M. Goldman

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The magnetic field and temperature dependencies of the magnetic moments of superconducting crystals of V3Si have been studied. In a constant magnetic field and at temperatures somewhat below the superconducting transition temperature, the moments are hysteretic in temperature. However, the magnetic moment-magnetic field isotherms are reversible and exhibit features that formally resemble the pressure-volume isotherms of the liquid-gas transition. This suggests the existence of a first-order phase transition, a two-phase regime, and a critical point in the superconducting phase diagram. The two phases are disordered vortex configurations with the same magnetization, but with different vortex densities. The entropy change, determined from the data using the Clausius-Clapeyron equation, is consistent with estimates based on the difference in the vortex densities of the two phases.

Original languageEnglish (US)
Pages (from-to)171-176
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume400
Issue number3-4
DOIs
StatePublished - Jan 1 2004

Bibliographical note

Funding Information:
Supported by the Condensed Matter Physics Program of the National Science Foundation under grant NSF/DMR-0138209.

Keywords

  • Phase diagram
  • Type-II superconductors
  • Vortices

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