Ordering in a spin glass under applied magnetic field

Details Ordering in a spin glass under applied magnetic field Ordering in a spin glass under applied magnetic field

1999-10-22

arxiv.org/abs/cond-mat/9910353v1

Phys. Rev. Lett 83, 5130 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 3 figures, accepted for PRL

Scientific paper

10.1103/PhysRevLett.83.5130

Torque, torque relaxation, and magnetization measurements on a AuFe spin glass sample are reported. The experiments carried out up to 7 T show a transverse irreversibility line in the (H,T) plane up to high applied fields, and a distinct strong longitudinal irreversibility line at lower fields. The data demonstrate for that this type of sample, a Heisenberg spin glass with moderately strong anisotropy, the spin glass ordered state survives under high applied fields in contrast to predictions of certain "droplet" type scaling models. The overall phase diagram closely ressembles those of mean field or chiral models, which both have replica symmetry breaking transitions.

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