Field dependence of the magnetic quantum phase transition in MnSi

C. Pfleiderer, C. Thessieu, A. N. Stepanov, G. Lapertot, M. Couach, J. Flouquet

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We report on precision measurements of the AC susceptibility in high-purity samples of MnSi as a function of pressure up to 16 kbar, field up to 7 T and temperature down to 30 mK. In zero field it has previously been shown, that the weakly spin polarised (ordered) phase collapses above a critical pressure Pc = 14.6 kbar. The normal metallic state at this quantum phase transition was thereby reported to be consistent with the presence of a highly dispersive spectrum of magnetic fluctuations. Our new results reveal that a field polarised state is restored above Pc by application of a magnetic field, which can be considered as a further sensitive control parameter to tune a quantum critical regime. The crossover between the non-polarised and polarised regimes is characterised by a strongly field and pressure dependent maximum in X characteristic of itinerant electron metamagnetism.

Original languageEnglish
Pages (from-to)576-579
Number of pages4
JournalPhysica B: Condensed Matter
Volume230-232
DOIs
StatePublished - Feb 1997
Externally publishedYes

Keywords

  • AC susceptibility
  • MnSi
  • Non-Fermi liquid system
  • Phase transition
  • Quantum phase transition

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