Wavevector and spin reorientation in MnSi

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Abstract
A mean-field theory of spin-density-wave wavevector and polarisation vector rotation induced by the application of a magnetic field to MnSi in its spin-density-wave phase, and a prediction of the associated spin reorientation phase transitions, is presented. The dependences of the Neel temperature and the homogeneous magnetisation on applied magnetic field strength and orientation are studied, as is the staggered susceptibility which diverges at the spin orientation phase transition.

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