THE INFLUENCE OF EXTERNAL PRESSURE ON THE BEHAVIOR OF THE METALLIC PHASE IN ORGANIC QUASI-TWO-DIMENSIONAL CONDUCTOR к-(BEDT - TTF)2Hg(SCN)2Cl. CONTRIBUTION OF CORRELATION EFFECTS

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The quasi-two-dimensional organic metal к-(BEDT-TTF)2Hg(SCN)2Cl transfers to a Mott insulator state when cooled below T = 30 K. External hydrostatic pressure of P > 0.7 kbar restores the metallic state and enables the study of resistance, magnetoresistance, and Shubnikov–de Haas oscillations at helium temperatures in the external pressure range of P = (1-8) kbar. The spectrum of observed Shubnikov–de Haas oscillations agrees well with theoretical calculations of the band structure. At the same time, the oscillation characteristics (cyclotron mass, frequency, amplitude) are significantly influenced by electronic correlations. Strongly correlated systems also exhibit specific temperature dependence of resistance. Pressure serves as the main tool controlling the strength of correlations. Various versions of pressure influence on the behavior of the nonoscillating part of magnetoresistance are discussed.

Sobre autores

S. Pesotskiy

FRC of Problems of Chemical Physics and Medical Chemistry of the Russian Academy of Sciences

Email: pesot@icp.ac.ru
Rússia, 142432, Chernogolovka, Moscow region

R. Lyubovskiy

FRC of Problems of Chemical Physics and Medical Chemistry of the Russian Academy of Sciences

Email: pesot@icp.ac.ru
Rússia, 142432, Chernogolovka, Moscow region

V. Zverev

Osipyan Institute of Solid State Physics of the Russian Academy of Sciences

Email: pesot@icp.ac.ru
Rússia, 142432, Chernogolovka, Moscow region

P. Grigor'ev

Landau Institute for Theoretical Physics of the Russian Academy of Sciences; National University of Science and Technology MISIS

Email: pesot@icp.ac.ru
142432, Chernogolovka, Moscow region; 119049, Moscow

T. Mogilyuk

National Research Center Kurchatov Institute

Email: pesot@icp.ac.ru
123182, Moscow

S. Torunova

FRC of Problems of Chemical Physics and Medical Chemistry of the Russian Academy of Sciences

Email: pesot@icp.ac.ru
Rússia, 142432, Chernogolovka, Moscow region

E. Zhilyaeva

FRC of Problems of Chemical Physics and Medical Chemistry of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: pesot@icp.ac.ru
Rússia, 142432, Chernogolovka, Moscow region

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