Abstract：We have utilized second harmonic generation (SHG) to disentangle the coupled first-order charge order/structural transition at $T_{\rm c}\sim281$ K in the transition-metal dichalocogenide IrTe$_{2}$, an exceptional layered material with 3D properties. The data from SHG shows extremely sharp transition in both the cooling and warming processes with less than 0.2 K transition window. Surface electronic symmetries of $C_{3v}$ and $S_{2}$ are observed in the high temperature and low temperature phases, respectively. Compared to neutron diffraction data for the structural transition (Phys. Rev. B 88 (2013) 115122) and to the electrical resistivity for the microscopic transition (Phys. Rev. B 95 (2017) 035148), our data indicates the electronic transition at the surface is the precursor to the structural transition.
. [J]. 中国物理快报, 2018, 35(9): 97102-.
J. E. Taylor, Z. Zhang, G. Cao, L. H. Haber, R. Jin, E. W. Plummer. Electronic Phase Transition of IrTe$_{2}$ Probed by Second Harmonic Generation. Chin. Phys. Lett., 2018, 35(9): 97102-.
2018, Vol. 35 
