Anomalous Fermi-liquid phase in metallic skyrmion crystals

Article

关键词: REAL-SPACE OBSERVATION;    NORMAL-STATE;    LATTICE;    MNSI;    TEMPERATURE;    TRANSITIONS;   

DOI  :  10.1103/PhysRevB.90.045145

来源: SCIE

【 摘 要 】

In noncentrosymmetric crystals such as MnSi, magnetic order can take the form of a skyrmion crystal (SkX). In this phase, conduction electrons coupled to the local magnetic moments acquire a Berry phase, leading to an emergent electromagnetism. Motivated by experimental reports of a non-Fermi-liquid phase in MnSi, in which resistivity is observed to scale as Delta rho similar to T-3/2, here we examine the effect of coupling phonons of an incommensurate SkX to electrons. Despite the formal similarity to a system consisting of a Fermi surface coupled to an electromagnetic field, the Berry phase fluctuations do not lead to non-Fermi-liquid behavior. Instead, we propose a different mechanism in which electrons scatter off columnar fluctuation in a three-dimensional SkX. When the effects of lattice-induced anisotropy are neglected, these fluctuations are ultrasoft and induce an anomalous Fermi liquid in which Landau quasiparticles survive but with an anomalous Delta rho(T)similar to T-7/4 resistivity perpendicular to the columns, and a Fermi-liquid resistivity along them.

【 授权许可】

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