Spin-dependent masses and field-induced quantum critical points

A. McCollam, R. Daou, S. R. Julian, C. Bergemann, J. Flouquet, D. Aoki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We discuss spin-dependent mass enhancements associated with field-induced quantum critical points in heavy-fermion systems. We have recently observed this phenomenon on a branch of the Fermi surface of CeRu2Si2 above its metamagnetic transition, complementing earlier work. In CeCoIn5, at high fields above a field-induced quantum critical point, we see a strong spin-dependence of the effective mass on the thermodynamically dominant sheets of the Fermi surface. These observations reinforce the suggestion that 'missing mass' in some cerium-based heavy-fermion systems will be found on heavy spin-polarised branches of the Fermi surface. In all cases where this phenomenon is observed the linear coefficient of specific heat is field dependent; however, CeCoIn5 seems to be the first such heavy-fermion system in which the f-electrons are definitely contributing to the Fermi volume, which puts it beyond the existing theory intended for metamagnetic systems.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPhysica B: Condensed Matter
Volume359-361
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2005 Apr 30
Externally publishedYes

Keywords

  • De Haas van Alphen
  • Heavy fermions
  • Metamagnetism
  • Quantum criticality

ASJC Scopus subject areas

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

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