Paper Title
Low Thermal Conductivity and Magneto-Suppressed Thermal Transport in Highly Oriented FeSb2 Single Crystal

Abstract
Thermoelectric materials have been widely explored for the potential applications inpower generation and refrigeration fields.High thermal conductivity (~500W/mK) of single crystalFeSb2limits the extensiveapplication in cryogenic cooling.In this work, high quality FeSb2 single crystalwith intrinsic low thermal conductivityhas been synthesized by the self-flux method.The rocking curve results reveal that the single crystal possesses quite high crystallinity. The micromorphology image shows that the single crystal ispyknoticwithout observable pores orcracks.Surprisingly, the thermal conductivity is reduced by two orders of magnitude compared with the sample prepared by the chemical vapor transport method. Furthermore, magnetic fields can further suppress the thermal transportby reducing the phonon mean-free path. The maximum suppression rate reaches 14% at 60 K when the magnetic fieldvaries from 0 T to 9 T. This work provides an effective synthetic method to reduce the thermal conductivity of FeSb2 single crystal, and the magneto-suppressed thermal transport strategy can apply to other thermoelectric materials. Keywords - Thermoelectric Materials, FeSb2, Low Thermal Conductivity, Single Crystal, Self-flux method.