Bose-Einstein Condensation of Magnons in TlCuCl_3 : Phase Diagram and Specific Heat from a Self-consistent Hartree-Fock Calculation with a Realistic Dispersion Relation(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We extend the self-consistent Hartree-Fock-Popov calculations by Nikuni et al. [Phys Rev Lett. 84 (2000) 5868] concerning the Bose-Eistein condensation of magnons in TlCuCl_3 to include a realistic dispersion of the excitations. The result for the critical field as a function of temperature behaves as H_C (T)-H_c (0)〜T^<3/2> below 2 K 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 λ-like shape at the transition and is in good qualitative agreement with the results of Oosawa et al. [Phys. Rev. B 63 (2001) 134416].
- 社団法人日本物理学会の論文
- 2004-12-15
著者
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Misguich Gregoire
Service De Physique Theorique Cea-saclay
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Misguich Gregoire
Service De Physique Theorique
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Oshikawa M
Tokyo Inst. Of Technol. Tokyo
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Oshikawa Masaki
Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo
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