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, respectiv...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2009-10, Vol.21 (43), p.436010-436010 (5)
Main Authors: Luo, X, Sun, Y P, Hu, L, Wang, B S, Lu, W J, Zhu, X B, Yang, Z R, Song, W H
Format: Article
Language:English
Subjects:
Adiabatic flow
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Entropy
Exact sciences and technology
Ferrimagnetism
Magnetic fields
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetization
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Magnetocaloric effect, magnetic cooling
Orbitals
Order disorder
Physics
Spinel
Vanadates
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/21/43/436010