Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction
Kirkpatrick, T. R. · Belitz, D.
Original · EN
The spin-orbit interaction strength gₛo in helical magnets determines both the pitch wave number q and the critical field Hc1 where the helix aligns with an external magnetic field. Within a standard Landau-Ginzburg-Wilson (LGW) theory, a determination of gₛo 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.
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