We studied temperature and magnetic field dependence of magnetization, M(T ) and M(B), on thiospinel FeCr 2 S 4 . We observed a step-like anomaly at T OO ∼ 9 K for M(T ) attributed to an orbital order transition in magnetic field 0 < B ≤ 7 T. Furthermore, also for M(B), an step-like anomaly appears at B c ∼ 5.5 T below T OO . This suggests an existence of a magnetic phase boundary at B c in T < T OO . Because the anomaly at B c of M(B) exists in the orbital ordered phase, the spin structure of FeCr 2 S 4 in T < T OO is strongly coupled with the lattice of the system.
The effects of Ni and Co substitution for the antiferromagnetic Heusler compounds Ru 2 CrZ (Z = Si or Ge) are studied by measuring magnetic and transport properties and specific heat. Ni substitution appears to not extensively affect the antiferromagnetic state. This contrasts sharply with the case for Ru 2−x Fe x CrSi where spin-glass-like behavior was found. These results are further compared with those for Ru 1.95 Co 0.05 CrGe, indicating that the magnetic properties are largely changed by different substitutions in these compounds.
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