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Low-temperature infrared spectroscopy of the strongly correlated semiconductor Tm0.19Yb0.81B12with dynamic charge stripes.
Zhukova, Elena; Melentyev, Aleksander; Gorshunov, Boris; Muratov, Andrey; Aleshchenko, Yurii; Azarevich, Andrey; Krasikov, Kirill; Shitsevalova, Natalya; Filipov, Volodymyr; Sluchanko, Nikolay.
Afiliación
  • Zhukova E; Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (National Research University), 141700 Dolgoprudny, Moscow Region, Russia.
  • Melentyev A; Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (National Research University), 141700 Dolgoprudny, Moscow Region, Russia.
  • Gorshunov B; Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (National Research University), 141700 Dolgoprudny, Moscow Region, Russia.
  • Muratov A; Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
  • Aleshchenko Y; Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
  • Azarevich A; Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (National Research University), 141700 Dolgoprudny, Moscow Region, Russia.
  • Krasikov K; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, Moscow 119991, Russia.
  • Shitsevalova N; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, Moscow 119991, Russia.
  • Filipov V; Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 03680 Kiev, Ukraine.
  • Sluchanko N; Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 03680 Kiev, Ukraine.
J Phys Condens Matter ; 34(46)2022 Sep 26.
Article en En | MEDLINE | ID: mdl-36103871
Tm1-xYbxB12dodecaborides represent model objects for the studies of quantum critical behavior, metal-insulator transitions (MITs) and complex charge-spin-orbital-phonon coupling phenomena. In spite of intensive investigations, the mechanism of semiconducting ground state formation both in YbB12and in the Yb-based strongly correlated electron systems remains a subject of active debates. We have performed first systematic measurements of temperature-dependent spectra of infrared conductivity of Tm0.19Yb81B12at frequencies 40-35 000 cm-1and in the temperature range 10-300 K. Analysis of the temperature evolution of the observed absorption resonances is performed allowing to associate these with the cooperative dynamic Jahn-Teller instability of the boron sub-lattice. This ferrodistortive effect of B12-complexes induces the rattling modes of the rare earth ions leading to emergence of both the intra-gap mixed-type collective excitations and the dynamic charge stripes. We estimate the temperature-dependent effective mass of charge carriers and propose the scenario of transformation of the many-body states in the multiple relaxation channels. We attribute the MIT to the localization of electrons at the vibrationally coupled Yb-Yb pairs, which is accompanied by the electronic phase separation and formation of the nanoscale filamentary structure of electron density (stripes) in Tm1-xYbxB12compounds.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Condens Matter Asunto de la revista: BIOFISICA Año: 2022 Tipo del documento: Article País de afiliación: Rusia Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Condens Matter Asunto de la revista: BIOFISICA Año: 2022 Tipo del documento: Article País de afiliación: Rusia Pais de publicación: Reino Unido