Possibility of observation of the critical paramagnetic longitudinal spin fluctuations in gadolinium by muon spin rotation spectroscopy

P. Dalmas de Réotier; A. Yaouanc

doi:10.1103/PhysRevLett.72.290

Possibility of observation of the critical paramagnetic longitudinal spin fluctuations in gadolinium by muon spin rotation spectroscopy

P. Dalmas de Réotier and A. Yaouanc

Phys. Rev. Lett. 72, 290 – Published 10 January 1994

Abstract

The theory described here shows that the muon spin depolarization rates measured on gadolinium in the critical paramagnetic region give direct information on the longitudinal (along the wave vector q) spin fluctuations. In the Ising regime it is possible to distinguish the parallel (along the c axis) from the perpendicular fluctuations.