2004/05/31 by Grégoire Misguich, Gregoire Misguich, Masaki Oshikawa · 1 citation
Physics and Astronomy · #Advanced Chemical Physics Studies #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.73.3429
published as J. Phys. Soc. Jpn. 73, 3429 (2004) · 7 pages, 6 figures (.eps), submitted to J. Phys. Soc. Jpn
arxiv created 2004/09/01 · openalex publication_date 2004/12/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We 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) T3/2 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)].