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| VOLUME 111 (2020) | ISSUE 8 | PAGE 524 |
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Tuning of electronic and vibrational properties of transition metal selenides TSe2 (T = Os, Ru) and their metallization under high pressure
P. G. Naumov+*, A. O. Baskakov*, S. S. Starchikov*, I. S. Lyubutin*, Yu. L. Ogarkova*, M. V. Lyubutina*, O. I. Barkalov×, S. A. Medvedev+
+Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany *Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 119333 Moscow, Russia ×Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
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. |