Quantum phase transition of itinerant helimagnets

Article

关键词: CRITICAL-BEHAVIOR;    1ST-ORDER;    POINTS;    MNSI;   

DOI  :  10.1103/PhysRevB.64.052404

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free