Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction

Details Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction

2009-08-23

arxiv.org/abs/0908.3342v2

Physics

Condensed Matter

Strongly Correlated Electrons

4pp, 2 figs

Scientific paper

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.

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