Unusual critical dynamics in AuFe re-entrant ferromagnets

  title={Unusual critical dynamics in AuFe re-entrant ferromagnets},
  author={Claire Lartigue and Ferenc Mezei and Catherine Pappas and Michel Henrique Machado Alba},
Abstract Neutron spin echo and triple axis spectrometry were used to study the critical dynamics of a AuFe re-entrant ferromagnet ( x = 16%). Our data show an unprecedented behaviour: for the same T / T c , κ is almost one order of magnitude smaller than in pure Fe, and Г does not depend on the temperature up to T / T c ⩽ 1.3.