Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study
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 consideri...
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MDPI AG
2020-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/19/4399 |
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| author | Karol Szałowski |
| author_facet | Karol Szałowski |
| author_sort | Karol Szałowski |
| collection | DOAJ |
| description | 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 <inline-formula><math display="inline"><semantics><mrow><mi>S</mi><mo>=</mo><mn>1</mn><mo>/</mo><mn>2</mn></mrow></semantics></math></inline-formula>. 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. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T15:53:13Z |
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| spelling | doaj.art-b7f3f87dee734285bf11b2d63a85a1872023-11-20T15:54:30ZengMDPI AGMaterials1996-19442020-10-011319439910.3390/ma13194399Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical StudyKarol Szałowski0Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź, ulica Pomorska 149/153, PL90-236 Łódź, PolandThe 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 <inline-formula><math display="inline"><semantics><mrow><mi>S</mi><mo>=</mo><mn>1</mn><mo>/</mo><mn>2</mn></mrow></semantics></math></inline-formula>. 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.https://www.mdpi.com/1996-1944/13/19/4399magnetocaloric effectmagnetic entropymolecular magnetmagnetic clusterisotermal entropy changemagnetic Grüneisen ratio |
| spellingShingle | Karol Szałowski Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study Materials magnetocaloric effect magnetic entropy molecular magnet magnetic cluster isotermal entropy change magnetic Grüneisen ratio |
| title | Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study |
| title_full | Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study |
| title_fullStr | Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study |
| title_full_unstemmed | Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study |
| title_short | Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study |
| title_sort | low temperature magnetocaloric properties of v12 polyoxovanadate molecular magnet a theoretical study |
| topic | magnetocaloric effect magnetic entropy molecular magnet magnetic cluster isotermal entropy change magnetic Grüneisen ratio |
| url | https://www.mdpi.com/1996-1944/13/19/4399 |
| work_keys_str_mv | AT karolszałowski lowtemperaturemagnetocaloricpropertiesofv12polyoxovanadatemolecularmagnetatheoreticalstudy |