Anomalous increase of T C in UGa2 under pressure
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UGa2 is 5f ferromagnet with T C = 126 K. High-pressure study of a single crystal exhibits a dramatic increase of T C without any sign of saturation, reaching 155 K at p = 7 GPa, corresponding to +4 K/GPa. Such effect can be understood assuming a weak 5f delocalization and an exchange interaction driven by the hybridization with non-f states, which is strengthened under pressure.
KeywordsUranium Ferromagnetism High pressure Hybridization
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