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Article Dans Une Revue Journal de Physique Lettres Année : 1985

Magnetic excitations of a Heisenberg spin glass : evidence for a gap in high magnetic fields

C. Marcenat
Angélique Benoit
  • Fonction : Auteur
A. Briggs
  • Fonction : Auteur
C. Arzoumanian
  • Fonction : Auteur
A.M. de Goer
  • Fonction : Auteur
F. Holtzberg
  • Fonction : Auteur

Résumé

Measurements of the specific heat C(T) of a spin glass Eu 0.44Sr0.56S single crystal have been performed between 0.7 and 10 K, and with applied magnetic fields (H = 0, 4, 6 and 7 T). The application of a large magnetic field strongly modifies the C( T) behaviour, with a large decrease at low temperatures : the quasilinear variation observed in zero field is replaced by an exponential variation characteristic of the opening of a gap in the excitation spectrum. These results, together with those of magneto-thermal resistivity obtained previously, can be described with the assumption of two kinds of magnetic excitations : (i) very low energy collective excitations and (ii) single spin excitations of Eu2+ ions in the external magnetic field augmented by some internal field of 3.2 T, the origin of which is discussed.
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Dates et versions

jpa-00232561 , version 1 (04-02-2008)

Identifiants

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C. Marcenat, Angélique Benoit, A. Briggs, C. Arzoumanian, A.M. de Goer, et al.. Magnetic excitations of a Heisenberg spin glass : evidence for a gap in high magnetic fields. Journal de Physique Lettres, 1985, 46 (12), pp.569-574. ⟨10.1051/jphyslet:019850046012056900⟩. ⟨jpa-00232561⟩

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