Magnetic field induced spin reorientation transitions in U3Sb4

Pressure effect on spin reorientation transition in U3As4

“…The flopped moments are slightly reduced with respect to the remaining one, but all moments are parallel to each other and to the (100) axis. The temperature and magnetic field dependent magnetisation for U3Sb 4 (T C = 140 K) is consistent with that expected for the CFi phase [4].…”

“…The hybridisation-mediated two-ion interaction leads to a highly anisotropic noncollinear ferromagnetic phase proved for U3P 4 (T c = 138 K) and U3As 4 (T c = 196 K) by neutron diffraction [1]. Discovery of the field-induced phase transition in U3As 4 at H c = 190 kOe and T= 4.2 K [2] was fruitful in the examination and understanding of magnetism of this compound [3,4]. We present here the effect of pressure on its H c.…”

“…For sample 2 the magnetisation above H c is clearly enhanced. In order to understand this effect we have compared this behaviour with that predicted by the spin Hamiltonian model of Przystawa [4].…”

“…The two-ion anisotropic exchange-interaction tensor is characterised by components J and K. The hitherto most advanced application of this model to the study of the U3X 4 pnictides was for the spin S = 1 in Ref. [4], where the model is also described.…”

Neutron diffraction study of magnetic structure of and

“…U 3 Bi 4 and U 3 Sb 4 crystallize in the body centred cubic structure (T 6 d or I 43d space group). They are magnetically ordered systems with fairly high Curie temperatures and with strong hybridization of U 5f electrons with conduction band electrons [1,2]. Another interesting feature of these systems comes from the fact that despite the overall cubic symmetry, the local symmetry of the U-ion neighbourhood is low.…”