Quantum phase transition of itinerant helimagnets

Thomas Vojta, Rastko Sknepnek

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We investigate the quantum phase transition of itinerant electrons from a paramagnet to a state which displays long-period helical structures due to a Dzyaloshinskii instability of the ferromagnetic state. In particular, we study how the self-generated effective long-range interaction recently identified in itinerant quantum ferromagnets is cut off by the helical ordering. We find that for a sufficiently strong Dzyaloshinskii instability the helimagnetic quantum phase transition is of second order with mean-field exponents. In contrast, for a weak Dzyaloshinskii instability the transition is analogous to that in itinerant quantum ferromagnets, i.e., it is of first order, as has been observed in MnSi.

Original languageEnglish
JournalPhysical review B: Condensed Matter and Materials Physics
Volume64
Issue number5
DOIs
Publication statusPublished - 13 Jul 2001

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