Electronic Phase Transition of IrTe_2 Probed by Second Harmonic Generation

J. E. Taylor; Z. Zhang; G. Cao; L. H. Haber; R. Jin; E. W. Plummer

doi:10.1088/0256-307X/35/9/097102

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Electronic Phase Transition of IrTe $_{2}$ Probed by Second Harmonic Generation

¹Department of Physics & Astronomy, Louisiana State University, LA 70803, USA
²Department of Chemistry, Louisiana State University, LA 70803, USA

Funds: Supported by the National Science Foundation under Grant No DMR-1504226.

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Received Date: August 27, 2018

Published Date: August 31, 2018

Abstract

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.

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Electronic Phase Transition of IrTe $_{2}$ Probed by Second Harmonic Generation

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Electronic Phase Transition of IrTe $_{2}$ Probed by Second Harmonic Generation