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Specific Heat Study of the Field-Induced Magnetic Ordering in the Spin Gap System TlCuCl$_3$ | | A. Oosawa
; H. Aruga Katori
; H. Tanaka
; | | Date: |
25 Oct 2000 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | Specific heat measurements have been performed in the coupled dimer system TlCuCl$_3$, which has a singlet ground state with the excitation gap $Delta simeq 7.5$K. The cusplike anomaly indicative of the 3D magnetic ordering was clearly observed in magnetic fields higher than the critical field $H_c$ corresponding to the gap $Delta$. The phase boundary determined by the present specific heat measurements coincides with that determined by previous magnetization measurements. The phase boundary can be described by the power law $[ H_{
m c}(T)-H_{
m g} ] propto T^{phi}$ with $phi=2.1(1)$. This result supports the magnon Bose condensation picture for the field-induced magnetic ordering in TlCuCl$_3$ [Nikuni {it et al}., Phys. Rev. Lett. {f 84} (2000) 5868]. | | Source: | arXiv, cond-mat/0010383 | | Services: | Forum | Review | PDF | Favorites | |
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