Anisotropic field dependence of the magnetic transition in Cu2Te2O5Br2

Details Anisotropic field dependence of the magnetic transition in Cu2Te2O5Br2 Anisotropic field dependence of the magnetic transition in Cu2Te2O5Br2

2004-06-22

arxiv.org/abs/cond-mat/0406522v1

Eur. Phys. J. B 42, 549 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

10.1140/epjb/e2005-00013-y

We present the results of measurements of the thermal conductivity of Cu2Te2O5Br2, a compound where tetrahedra of Cu^{2+} ions carrying S=1/2 spins form chains along the c-axis of the tetragonal crystal structure. The thermal conductivity kappa was measured along both the c- and the a-direction as a function of temperature between 3 and 300 K and in external magnetic fields H up to 69 kOe, oriented both parallel and perpendicular to the c-axis. Distinct features of kappa(T) were observed in the vicinity of T_N=11.4 K in zero magnetic field. These features are unaltered in external fields which are parallel to the c-axis, but are more pronounced when a field is applied perpendicularly to the c-axis. The transition temperature increases upon enhancing the external field, but only if the field is oriented along the a-axis.

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