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Письма в Журнал экспериментальной и теоретической физики, 2011, том 93, выпуск 3, страницы 182–185
(Mi jetpl1828)
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Эта публикация цитируется в 54 научных статьях (всего в 54 статьях)
КОНДЕНСИРОВАННОЕ СОСТОЯНИЕ
Electronic structure, topological phase transitions and superconductivity in (K,Cs)$_{x}$Fe$_2$Se$_2$
I. A. Nekrasov, M. V. Sadovskii Institute for Electrophysics RAS, Ural Branch, 620016 Ekaterinburg, Russia
Аннотация:
We present LDA band structure of novel hole doped high temperature superconductors ($T_c\sim 30\,$K) K$_x$Fe$_2$Se$_2$ and Cs$_x$Fe$_2$Se$_2$ and compare it with previously studied electronic structure of isostructural FeAs superconductor BaFe$_2$As$_2$ (Ba122). We show that stoichiometric KFe$_2$Se$_2$ and CsFe$_2$Se$_2$ have rather different Fermi surfaces as compared with Ba122. However at about 60% of hole doping Fermi surfaces of novel materials closely resemble those of Ba122. In between these dopings we observe a number of topological Fermi surface transitions near the $\Gamma$ point in the Brillouin zone. Superconducting transition temperature $T_c$ of new systems is apparently governed by the value of the total density of states (DOS) at the Fermi level.
Поступила в редакцию: 30.12.2010
Образец цитирования:
I. A. Nekrasov, M. V. Sadovskii, “Electronic structure, topological phase transitions and superconductivity in (K,Cs)$_{x}$Fe$_2$Se$_2$”, Письма в ЖЭТФ, 93:3 (2011), 182–185; JETP Letters, 93:3 (2011), 166–169
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl1828 https://www.mathnet.ru/rus/jetpl/v93/i3/p182
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