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We report a study of the low-temperature heat transport in thequasi-one-dimensional S = 1/2 alternating antiferromagnetic-ferromagnetic chaincompound (CH_{3})_{2}NH_{2}CuCl_{3}. Both the temperature and magnetic-fielddependencies of thermal conductivity are very complicated, pointing to theimportant role of spin excitations. It is found that magnetic excitations actmainly as the phonon scatterers in a broad temperature region from 0.3 to 30 K.In magnetic fields, the thermal conductivity show drastic changes, particularlyat the field-induced transitions from the low-field N\'{e}el state to thespin-gapped state, the field-induced magnetic ordered state, and the spinpolarized state. In high fields, the phonon conductivity is significantlyenhanced because of the weakening of spin fluctuations.

Heat transport of the quasi-one-dimensional alternating spin chain material (CH_{3})_{2}NH_{2}CuCl_{3}