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Spin glass behavior in URh2Ge2

S. Sullow, G. J. Nieuwenhuys, A. A. Menovsky, J. A. Mydosh, S. A. M. Mentink, T. E. Mason, W. J. L Buyers

cond-mat.stat-mecharXiv:cond-mat/9611169

Abstract

URh2Ge2 occupies an extraordinary position among the heavy-electron 122-compounds, by exhibiting a previously unidentified form of magnetic correlations at low temperatures, instead of the usual antiferromagnetism. Here we present new results of ac and dc susceptibilities, specific heat and neutron diffraction on single-crystalline as-grown URh2Ge2. These data clearly indicate that crystallographic disorder on a local scale produces spin glass behavior in the sample. We therefore conclude that URh2Ge2 is a 3D Ising-like, random-bond, heavy-fermion spin glass.

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