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A strong increase of the thermal conductivity is observed at the phase transition (T c=18.2 K) in Cu2Te2O5Cl2 single crystal. This behavior is compared with that of the spin-Peierls system NaV2O5, where a similar experimental observation has been made, and the conventional spin-Peierls system CuGeO3, where a modest kink in the thermal conductivity curve has been observed. The strong increase of the thermal conductivity atT c in Cu2Te2O5Cl2 could be partially attributed to the opening of the energy gap in the magnetic excitation spectrum evident from the magnetic susceptibility measurements. However, the main reason for the anomaly of the thermal conductivity could be explained by a strong spin-lattice coupling in this system, which what is in agreement with the preliminary X-band electron spin resonance measurement.

Anomalous thermal conductivity of single crystal Cu2Te2O5Cl2