The field-induced magnetic ordering transition in TlCuCl$_3$

Details The field-induced magnetic ordering transition in TlCuCl$_3$ The field-induced magnetic ordering transition in TlCuCl$_3$

2004-09-21

arxiv.org/abs/cond-mat/0409530v1

J. Phys. Soc. Jpn. 74 Suppl., 129 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 7 figures

Scientific paper

In the first part we investigate in detail if the Bose-Einstein condensation scenario for magnons can quantitatively explain the observed field-induced magnetic ordering in TlCuCl$_3$. We use a bond-operator approach to map the spin system onto hard-core bosons and exactly account for the hard-core constraint in the dilute limit. We solve the hard-core model within the Hartree-Fock-Popov approximation and discuss its validity and the consequences of this approximation for the critical properties. In the second part the effects of spin-phonon and spin-orbit coupling are discussed within this framework. We show that the experimental magnetization and specific heat data are well described if a certain type of anisotropy is included. We also present predictions for the quasiparticle gap which might be tested in the future.

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