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- W2782283824 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 Gruneisen parameter ${mathrm{ensuremath{Gamma}}}_{H}$ of the system of triplons in spin gapped quantum magnets. Near the critical temperature ${mathrm{ensuremath{Gamma}}}_{H}$ 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 ${H}_{c},phantom{rule{0.16em}{0ex}}{mathrm{ensuremath{Gamma}}}_{H}$ diverges as ${mathrm{ensuremath{Gamma}}}_{H}ensuremath{sim}1/{T}^{2}$, while it scales as ${mathrm{ensuremath{Gamma}}}_{H}ensuremath{sim}1/(Hensuremath{-}{H}_{c})$ as the magnetic field approaches ${H}_{c}$." @default.
- W2782283824 created "2018-01-12" @default.
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- W2782283824 date "2018-10-10" @default.
- W2782283824 modified "2023-09-25" @default.
- W2782283824 title "Magnetocaloric effect and Grüneisen parameter of quantum magnets with a spin gap" @default.
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- W2782283824 doi "https://doi.org/10.1103/physrevb.98.144416" @default.
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