Abstract
UCo2Si2 (tetragonal crystal structure) is antiferromagnet below TN = 83K with ferromagnetic basal-plane layers of U magnetic moments oriented parallel to the c axis. The layers are coupled in +−+− sequence along this axis. In fields of 45T applied along the c axis, UCo2Si2 exhibits very sharp metamagnetic transition to ++- uncompensated antiferromagnetic state. The transition is accompanied by pronounced magnetostriction effects. The crystal expands along the c axis by 1 * 10−4 and shrinks in the basal plane by 0.5 * 10−4 (at 1.5K) resulting in negligible volume effect. Between 20K and 40K the transition changes from the first- to the second-order type. The Fe doping in UCo2Si2 reduces TN from 83K to 80K at x = 0.2 in U(Co1-xFex)2Si2. Metamagnetic transition shifts to higher fields (from 45T at x = 0–56T for x = 0.2). Magnetization jump over the transition remains practically the same which is in agreement with uranium magnetic moment determined by neutron diffraction on crystal with x = 0.1 as 1.29 μB, i.e. only slightly lower than that in UCo2Si2.
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