Anomalous pinning fields in itinerant helical magnets: Screening of the quasiparticle interaction

Article

关键词: WEAK FERROMAGNETISM;    SPIN FLUCTUATIONS;    MNSI;    FEGE;    STATE;   

DOI  :  10.1103/PhysRevB.80.220401

来源: SCIE

【 摘 要 】

The spin-orbit interaction strength g(so) in helical magnets determines both the pitch wave number q and the critical field H(c1) where the helix aligns with an external magnetic field. Within a standard Landau-Ginzburg-Wilson (LGW) theory, a determination of g(so) in MnSi and FeGe from these two observables yields values that differ by a factor of 20. This discrepancy is remedied by considering the fermionic theory underlying the LGW theory and in particular the effects of screening on the effective electron-electron interaction that results from an exchange of helical fluctuations.

【 授权许可】

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