Triplon Localization Effect in Tl_{1-x}$K_xCuCl_3

Details Triplon Localization Effect in Tl_{1-x}$K_xCuCl_3 Triplon Localization Effect in Tl_{1-x}$K_xCuCl_3

2003-10-29

arxiv.org/abs/cond-mat/0310691v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

The effect of randomness on field-induced magnetic ordering was investigated through specific heat measurements in Tl$_{1-x}$K$_x$CuCl$_3$ with $x\leq 0.22$. The isostructural parent compounds TlCuCl$_3$ and KCuCl$_3$ are coupled spin dimer systems with a gapped ground state and their field-induced antiferromagnetic ordering is described by the Bose condensation of spin triplets (triplons). Well-defined field-induced phase transitions were observed in Tl$_{1-x}$K$_x$CuCl$_3$. The critical exponent $\phi$ of the phase boundary defined by $T(H) \propto (H-H_{\rm c})^{1/\phi}$ is reevaluated in TlCuCl$_3$ as $\phi=1.67 \pm 0.07$, which is close to $\phi_{\rm BEC} =3/2$ derived from the triplon BEC theory. For $x \neq 0$, the exponent $\phi$ decreases systematically with $x$. The phase boundary observed at low temperatures for $x>0.1$ is almost a linear function of temperature $T$. In the low-field region for $H

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