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Magnetic study of low-temperature phase of UCu2Ge2

机译：Magnetic study of low-temperature phase of UCu2Ge2

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Magnetization and phase sensitive AC susceptibility was measured for the annealed and as-cast samples of ferromagnetic UCu2Ge2, T-C = 107 K. Special attention was paid to the low temperature range, T < 50 K, which is interesting due to the magnetization decrease and frozen AC response. The hysteresis loops showed a remanence of approximate to 87 and a fast, thermally activated decrease in the coercivity field. Thermoremanent magnetization at 4.3 K decayed with the relaxation time approximate to 1 * 10(3) s. The strong increase of the chi(AC) with the amplitude of the driving field was observed. All these results point to a very large anisotropy of the compound at the lowest temperatures. Phase transition to the randomly canted ferromagnetic phase at T approximate to 55 K was detected in the measurement of the third order non-linear susceptibility. It is concluded that the origin of the transition is the strong temperature dependence of magnetic anisotropy.

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