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Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study

Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź, ulica Pomorska 149/153, PL90-236 Łódź, Poland
Materials 2020, 13(19), 4399; https://doi.org/10.3390/ma13194399
Received: 28 August 2020 / Revised: 16 September 2020 / Accepted: 28 September 2020 / Published: 2 October 2020
(This article belongs to the Section Materials Physics)
The paper presents a computational study of the magnetocaloric properties of the V12 polyoxovanadate molecular magnet. The description is restricted to low-temperature range (below approximately 100 K), where the magnetic properties of the system in question can be sufficiently modelled by considering a tetramer that consists of four vanadium ions with spins S=1/2. The discussion is focused on the magnetocaloric effect in the cryogenic range. The exact and numerical diagonalization of the corresponding Hamiltonian is used in order to construct the thermodynamic description within a version of the canonical ensemble. The thermodynamic quantities of interest, such as magnetic entropy, specific heat, entropy change under isothermal magnetization/demagnetization, temperature change under adiabatic magnetization/demagnetization, refrigerant capacity, and magnetic Grüneisen ratio, are calculated and discussed extensively. The importance of two quantum level crossings for the described properties is emphasized. The significant ranges of direct and inverse magnetocaloric effect are predicted. In particular, the maximized inverse magnetocaloric response is found for cryogenic temperatures. View Full-Text
Keywords: magnetocaloric effect; magnetic entropy; molecular magnet; magnetic cluster; isotermal entropy change; magnetic Grüneisen ratio; tetramer; polyoxovanadate magnetocaloric effect; magnetic entropy; molecular magnet; magnetic cluster; isotermal entropy change; magnetic Grüneisen ratio; tetramer; polyoxovanadate
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MDPI and ACS Style

Szałowski, K. Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study. Materials 2020, 13, 4399. https://doi.org/10.3390/ma13194399

AMA Style

Szałowski K. Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study. Materials. 2020; 13(19):4399. https://doi.org/10.3390/ma13194399

Chicago/Turabian Style

Szałowski, Karol. 2020. "Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study" Materials 13, no. 19: 4399. https://doi.org/10.3390/ma13194399

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