Spin glass-like behaviour of the singlet ground state system: ThTb

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Abstract

We have studied the temperature and field dependence of the magnetic susceptibility, X, on the single-ground-state Th1−nTbn system, in the 0.2 < n < 0.6 concentration range. The characteristic maximum of a spin glass transition was found at a temperature Tg, which increases linearly with the impurity concentration. As expected, the maximum of X is reduced by the increment of the applied magnetic field. The spin glass order parameter, as well as its critical exponent were evaluated by using the Sherrington-Kirkpatrick theory.

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Alexander von Humboldt Fellow. On leave of absence from Centro Atomico Bariloche, CNEA, Argentina.

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