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Crystal-field effects in the first-order valence transition in YbInCu4 induced by an external magnetic field

As was shown earlier (Dzero M O, Gor'kov L P and Zvezdin A K 2000 J. Phys.: Condens. Matter 12 L711), the properties of the first-order valence phase transition in YbInCu4 over a wide range of magnetic fields and temperatures can be perfectly described on the basis of a simple entropy transition for free Yb ions. Within this approach, the crystal-field effects have been taken into account and we show that the phase diagram in the B-T plane acquires some anisotropy with respect to the direction of an external magnetic field.