Field dependence of the magnetic quantum phase transition in MnSi

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 pr...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1997-02, Vol.230, p.576-579
Main Authors: Pfleiderer, C., Thessieu, C., Stepanov, A.N., Lapertot, G., Couach, M., Flouquet, J.
Format: Article
Language:English
Subjects:
AC susceptibility
MnSi
Non-Fermi liquid system
Phase transition
Quantum phase transition
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Summary: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 P c = 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 P c 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 χ characteristic of itinerant electron metamagnetism.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(96)00751-X