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Magnetocaloric effect and Grüneisen parameter of quantum magnets with a spin gap


Rakhimov, Abdulla; Gazizulina, Alsu; Narzikulov, Zabardast; Schilling, Andreas; Sherman, E Ya (2018). Magnetocaloric effect and Grüneisen parameter of quantum magnets with a spin gap. Physical review. B, 98(14):144416.

Abstract

We obtained, within a path-integral formalism (mean-field variational Gaussian approximation), analytical expressions for thermodynamic quantities such as magnetization, heat capacity, and the magnetic Grüneisen parameter ΓH of the system of triplons in spin gapped quantum magnets. Near the critical temperature ΓH is discontinuous and changes its sign upon the Bose-Einstein condensation (BEC) of triplons. We predict that in the limit of low temperature T and near the critical magnetic field Hc,ΓH diverges as ΓH∼1/T2, while it scales as ΓH∼1/(H−Hc) as the magnetic field approaches Hc.

Abstract

We obtained, within a path-integral formalism (mean-field variational Gaussian approximation), analytical expressions for thermodynamic quantities such as magnetization, heat capacity, and the magnetic Grüneisen parameter ΓH of the system of triplons in spin gapped quantum magnets. Near the critical temperature ΓH is discontinuous and changes its sign upon the Bose-Einstein condensation (BEC) of triplons. We predict that in the limit of low temperature T and near the critical magnetic field Hc,ΓH diverges as ΓH∼1/T2, while it scales as ΓH∼1/(H−Hc) as the magnetic field approaches Hc.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > Condensed Matter Physics
Language:English
Date:10 October 2018
Deposited On:20 Dec 2018 12:40
Last Modified:29 Jul 2020 08:28
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevb.98.144416

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