Abstract
We measured the temperature dependence of the magnetic susceptibility and specific heat and the magnetic-field dependence of the magnetization of CuInVO5. An antiferromagnetically ordered state appears below TN = 2.7 K. We observed a quantum magnetization plateau above 30 T at 1.3 K. The probable spin model for CuInVO5 is an interacting spin- tetramer model. We evaluated the values of the intratetramer interactions as J1 = 240 ± 20 K (antiferromagnetic) and J2 = −142 ± 10 K (ferromagnetic) and the value of the effective intertetramer interaction as Jeff = 30 ± 4 K. The ground state of the isolated spin tetramer with the J1 and J2 values is spin singlet. The shrinkage of ordered magnetic moments by quantum fluctuation can be expected. Longitudinal-mode magnetic excitations may be observable in CuInVO5.
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