Raman scattering of IrTe$_2$

ORAL

Abstract

IrTe$_2$ presents a layered compound with a triangular lattice. It is known to exhibit a first order structural phase transition at approximately 260~K which is of a first order, corresponding to a formation of a superstructure with a period of five unit cells. Using polarized Raman spectroscopy we have studied the temperature dependence of 14 observed Raman allowed phononic modes. These phonons couple strongly to this transition and one additional first order transition at approximately 170~K. In the high-temperature phase only 3 modes are observed, while below approximately 280~K all 14 modes become visible. Below approximately 170~K only 11 modes are observed. Our results shed light on the possible mechanism driving the transitions.

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Authors

  • Alexander Lee

    Rutgers, The State University of New Jersey

  • Verner Thorsmolle

    Rutgers, the State University of New Jersey, Rutgers, The State University of New Jersey

  • Sergey Artyukhin

    Rutgers, The State University of New Jersey

  • J.J. Yang

    Pohang University of Science and Technology, Korea, Pohang University of Science and Technology, Laboratory for Pohang Emergent Materials and Department of Physics, Pohang University

  • S.-W. Cheong

    Rutgers University, Department of Physics, Rutgers University, Rutgers University, NJ, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers U., NJ, USA, Rutgers, The State University of New Jersey, Department of Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway 08854, NJ, USA

  • Girsh Blumberg

    Rutgers, the State University of New Jersey, Rutgers, The State University of New Jersey, Rutgers University