Low Temperature Physics: 42, 1057 (2016); https://doi.org/10.1063/1.4971169
Fizika Nizkikh Temperatur: Volume 42, Number 11 (November 2016), p. 1345-1353    ( to contents , go back )

Metal–insulator transitions and the magnetic susceptibility in doped cuprate compounds

S. Dzhumanov1, U.T. Kurbanov1,2, Z.S. Khudayberdiev1, and A.R. Hafizov1

1Институт ядерной физики АН РУз, г. Ташкент, 100214, Узбекистан

2Чирчикский профессиональный колледж промышленности и сферы услуг, г. Чирчик, 111700, Узбекистан
E-mail: dzhumanov@inp.uz; ulughqurbon@mail.ru
pos Анотація:

Received May 1, 2016

Abstract

The results of the theoretical study of the possibility of hole carriers localization and metal-insulator transitions that occur in the temperature dependences of the magnetic susceptibility χ(T) of doped copper-oxide (cuprate) compounds are presented. The criteria are analyzed for the metal-insulator transitions caused by a strong hole-lattice interaction and by the for-mation of very narrow polaron bands in these materials with decreasing the level of doping x. It has been shown that such metal-insulator transitions in doped cuprates La2–xSrxCuO4 and YBa2Cu3O6+x occur in the underdoped regime (i.e., when x varies from 0.04 to 0.12). The characteristic temperature dependences χ(T) are determined in the high-Tc cuprates with different levels of doping. The obtained results are in a good agreement with the experimental data on metal-insulator transitions and the magnetic susceptibility in the high-Tc cuprates.

PACS: 71.30.+h Metal-insulator transitions and oth-er electronic transitions;
PACS: 74.20.–z Theories and models of supercon-ducting state;
PACS: 74.25. Ha Magnetic properties including vor-tex structures and related phenomena;
PACS: 74.72.–h Cuprate superconductors.

Key words: metal-insulator transition; magnetic susceptibility; high-Tc cuprates.

Published online: September 26, 2016

Download 431916 byte View Contents