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Published September 20, 1993 | Published
Journal Article Open

Quenching of the nonlinear susceptibility at a T=0 spin glass transition

Abstract

LiHo_(0.167)Y_(0.833)F_4 is a dilute dipolar-coupled Ising magnet with a spin glass transition which can be crossed with temperature T (T_g=0.13 K) or with an effective transverse field Γ(Γ_g=1 K at T=0). The nonlinear susceptibility contains a diverging component which dominates at T=98 mK, but disappears by 25 mK. At the same time, the onset of spin glass behavior in the dissipative linear susceptibility becomes sharper. We conclude that, contrary to theoretical expectations, quantum transitions can be qualitatively different from thermally driven transitions in real spin glasses.

Additional Information

© 1993 The American Physical Society. Received 17 May 1993. We are grateful to D. Huse, H. M. Jaeger, A. Rojo, and A. P. Young for helpful discussions and thank S. Sachdev for preprints. The work at The University of Chicago was supported by the NSF Materials Research Laboratory under Grant No. DMR88-19860. D.B. acknowledges support from an ARO National Defense Science and Engineering Fellowship.

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Published - PhysRevLett.71.1919.pdf

Published - PhysRevLett.75.1679.pdf

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