Electronic Phase Transition of IrTe2 Probed by Second Harmonic Generation *Supported by the National Science Foundation under Grant No DMR-1504226. (September 2018)

• Record Type: Journal Article
• Authors: Taylor, J. E.; Zhang, Z.; Cao, G.; Haber, L. H.; Jin, R.; Plummer, E. W.
• Is Part Of: Chinese physics letters. Volume 35:Number 9(2018:Sep.)
• Publication Date: 2018-09
• Subjects: 71.30.+h -- 73.20.-r -- 71.20.Be -- 78.68.+m -- 71.45.Lr; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1088/0256-307X/35/9/097102
• Languages: English
• ISSNs: 0256-307X

Abstract

Abstract : We have utilized second harmonic generation (SHG) to disentangle the coupled first-order charge order/structural transition at T c ∼ 281 K in the transition-metal dichalocogenide IrTe2, 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 3 v 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 .