Эта публикация цитируется 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

Язык публикации: английский

 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2011, 93:3, 166–169

Реферативные базы данных:

• 
•