High-field instability of a field-induced triplon Bose-Einstein condensate
Abdulla RakhimovInstitute of Nuclear Physics, Tashkent 100214, UzbekistanE. Ya. ShermanDepartment of Physical Chemistry, University of Basque Country, 48080 Bilbao, SpainChul Koo KimInstitute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Republic of Korea
ABI
Аннотация
We study properties of magnetic field-induced Bose-Einstein condensate of triplons as a function of temperature and the field within the Hartree-Fock-Bogoliubov approach including the anomalous density. We show that the magnetization is continuous across the transition, in agreement with the experiment. In sufficiently strong fields the condensate becomes unstable due to triplon-triplon repulsion. As a result, the system is characterized by two critical magnetic fields: one producing the condensate and the other destroying it. We show that nonparabolic triplon dispersion arising due to the gapped bare spectrum and the crystal structure has a strong influence on the phase diagram.
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Показатели — AkademScholar · Скоро