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Tuning of the Electronic and Vibrational Properties of Transition Metal Selenides TSe2 (T = Os, Ru) and Their Metallization at High Pressures

  • Condensed Matter
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Abstract

We present a systematic analysis of electrical properties of two transition metal selenides OsSe2 and RuSe2 under conditions of low temperature down to 1.8 K and external pressure up to 43 GPa. Both compounds have a pyrite-type crystal structure under ambient conditions and, according to Raman spectroscopy, do not undergo phase transitions up to the highest pressures. OsSe2 and RuSe2 undergo semiconductor-to-metal transitions at pressures up to 15 GPa. Further increase in pressure leads to the appearance of a superconducting transition at low temperatures. At 40 GPa, the critical temperatures of the superconducting transition reach maximum values of 5.5 and 6 K for RuSe2 and OsSe2, respectively.

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Funding

The work on the preparation of the high-pressure cells, loading of high-pressure cells, Raman and transport measurements at high pressures, analysis and processing of the results of these measurements, and preparation of the manuscript was supported by the Russian Science Foundation (project no. 17-72-20200). The sample characterization was supported by the Ministry of Science and Higher Education of the Russian Federation (state assignment for the FSRC Crystallography and Photonics, Russian Academy of Sciences).

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Authors and Affiliations

  1. Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany

    P. G. Naumov & S. A. Medvedev

  2. Shubnikov Institute of Crystallography, Federal Scientific Research Centre Crystallography and Photonics, Russian Academy of Sciences, Moscow, 119333, Russia

    P. G. Naumov, A. O. Baskakov, S. S. Starchikov, I. S. Lyubutin, Yu. L. Ogarkova & M. V. Lyubutina

  3. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    O. I. Barkalov

Authors
  1. P. G. Naumov
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  2. A. O. Baskakov
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  3. S. S. Starchikov
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  4. I. S. Lyubutin
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  5. Yu. L. Ogarkova
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  6. M. V. Lyubutina
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  7. O. I. Barkalov
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  8. S. A. Medvedev
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Corresponding author

Correspondence to A. O. Baskakov.

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Naumov, P.G., Baskakov, A.O., Starchikov, S.S. et al. Tuning of the Electronic and Vibrational Properties of Transition Metal Selenides TSe2 (T = Os, Ru) and Their Metallization at High Pressures. Jetp Lett. 111, 456–462 (2020). https://doi.org/10.1134/S0021364020080044

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  • DOI: https://doi.org/10.1134/S0021364020080044

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