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Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV2O4

The magnetocaloric effect (MCE) in an orbital–spin-coupled spinel vanadate MnV2O4 is investigated by magnetization measurement. MnV2O4 has ferrimagnetic ordering occurring at TC = 57 K. The maximum magnetic entropy change reaches 14.8 and 24.0 J kg−1 K−1 for field changes of 0–2 and 0–4 T, respectively. The maximum adiabatic temperature is about 2.9 K for a magnetic field change of 2 T. Except for the spin entropy change, the observed giant MCE is suggested to be related to the orbital entropy change due to the change of the orbital state of V3+ induced by an applied magnetic field around TC.