Magnetic Lifshitz transition and its consequences in multi-band iron-based superconductors

被引：30

作者：

Ptok, Andrzej ^{[1
,2
]}

Kapcia, Konrad J. ^{[3
]}

Cichy, Agnieszka ^{[4
]}

Oles, Andrzej M. ^{[5
,6
]}

Piekarz, Przemyslaw ^{[2
]}

机构：

[1] Marie Curie Sklodowska Univ, Inst Phys, Pl M Sklodowskiej Curie 1, PL-20031 Lublin, Poland

[2] Polish Acad Sci, Inst Nucl Phys, Ul E Radzikowskiego 152, PL-31342 Krakow, Poland

[3] Polish Acad Sci, Inst Phys, Aleja Lotnikow 32-46, PL-02668 Warsaw, Poland

[4] Johannes Gutenberg Univ Mainz, Inst Phys, Staudingerweg 9, D-55099 Mainz, Germany

[5] Jagiellonian Univ, Marian Smoluchowski Inst Phys, Ul Prof S Lojasiewicza 11, PL-30348 Krakow, Poland

[6] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

关键词：

EXTENDED HUBBARD-MODEL; BCS-BEC CROSSOVER; UNCONVENTIONAL SUPERCONDUCTIVITY; 2-BAND SUPERFLUIDITY; HARTREE THEORY; FERMI-SURFACE; SYSTEMS; PHASE; FIELD; EVOLUTION;

D O I：

10.1038/srep41979

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In this paper we address Lifshitz transition induced by applied external magnetic field in a case of iron-based superconductors, in which a difference between the Fermi level and the edges of the bands is relatively small. We introduce and investigate a two-band model with intra-band pairing in the relevant parameters regime to address a generic behaviour of a system with hole-like and electron-like bands in external magnetic field. Our results show that two Lifshitz transitions can develop in analysed systems and the first one occurs in the superconducting phase and takes place at approximately constant magnetic field. The chosen sets of the model parameters can describe characteristic band structure of iron-based superconductors and thus the obtained results can explain the experimental observations in FeSe and Co-doped BaFe2As2 compounds.

引用

页数：11

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