Bose-Einstein Condensation of Magnons in TlCuCl3: Phase diagram and specific heat from a self-consistent Hartee-Fock calculation with a realistic dispersion relation

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dc.creatorMisguich, Gregoire
dc.creatorOshikawa, Masaki
dc.date2004-05-18
dc.date2004-09-01
dc.date.accessioned2026-07-07T02:58:14Z
dc.date.available2026-07-07T02:58:14Z
dc.descriptionWe extend the self-consistent Hartree-Fock-Popov calculations by Nikuni et al. [Phys. Rev. Lett. 84, 5868 (2000)] concerning the Bose-Eistein condensation of magnons in TlCuCl3 to include a realistic dispersion of the excitations. The result for the critical field as a function of temperature behaves as Hc(T)-Hc(0) T^{3/2} below 2K but deviates from this simple power-law at higher temperature and is in very good agreement with the experimental results. The specific heat is computed as a function of temperature for different values of the magnetic field. It shows a lambda-like shape at the transition and is in good qualitative agreement with the results of Oosawa et al. [Phys. Rev. B 63, 134416 (2001)].
dc.description7 pages, 6 figures (.eps), submitted to J. Phys. Soc. Jpn
dc.identifierhttps://arxiv.org/abs/cond-mat/0405422
dc.identifierhttp://arxiv.org/abs/cond-mat/0405422
dc.identifierJ. Phys. Soc. Jpn. 73, 3429 (2004)
dc.identifierdoi:10.1143/JPSJ.73.3429
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23996
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleBose-Einstein Condensation of Magnons in TlCuCl3: Phase diagram and specific heat from a self-consistent Hartee-Fock calculation with a realistic dispersion relation
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