| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electronic Phase Transition of IrTe$_{2}$ Probed by Second Harmonic Generation |
| J. E. Taylor1, Z. Zhang1, G. Cao1, L. H. Haber2, R. Jin1, E. W. Plummer1** |
1Department of Physics & Astronomy, Louisiana State University, LA 70803, USA
2Department of Chemistry, Louisiana State University, LA 70803, USA
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| Cite this article: |
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J. E. Taylor, Z. Zhang, G. Cao et al 2018 Chin. Phys. Lett. 35 097102 |
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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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Received: 28 August 2018
Published: 31 August 2018
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| PACS: |
71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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73.20.-r
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(Electron states at surfaces and interfaces)
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71.20.Be
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(Transition metals and alloys)
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78.68.+m
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(Optical properties of surfaces)
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71.45.Lr
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(Charge-density-wave systems)
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| Fund: Supported by the National Science Foundation under Grant No DMR-1504226. |
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