Measurements of electrical resistance under high pressure and neutron diffraction in high-magnetic field of single crystalline UNi2Si 2 have been performed. We have found the analogy between the p-T and B-T magnetic phase diagrams. It is also found that the propagation vector q z of incommensurate antiferromagnetic phase decreases with increasing magnetic field. A. new pronounced, pressure-induced incommensurate-commensurate magnetic phase transition has been detected.
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