Heat transport of the quasi-one-dimensional alternating spin chain   material (CH_{3})_{2}NH_{2}CuCl_{3}
  We report a study of the low-temperature heat transport in the quasi-one-dimensional S = 1/2 alternating antiferromagnetic-ferromagnetic chain compound (CH_{3})_{2}NH_{2}CuCl_{3}. Both the temperature and magnetic-field dependencies of thermal conductivity are very complicated, pointing to the important role of spin excitations. It is found that magnetic excitations act mainly as the phonon scatterers in a broad temperature region from 0.3 to 30 K. In magnetic fields, the thermal conductivity show drastic changes, particularly at the field-induced transitions from the low-field N\'{e}el state to the spin-gapped state, the field-induced magnetic ordered state, and the spin polarized state. In high fields, the phonon conductivity is significantly enhanced because of the weakening of spin fluctuations. 
L. M. Chen, X. M. Wang, W. P. Ke, Z. Y. Zhao, X. G. Liu, C. Fan, Q. J.   Li, X. Zhao, X. F. Sun (USTC)
cond-mat.str-el