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Possible role of bonding angle and orbital mixing in iron pnictide superconductivity: Comparative electronic structure studies of LiFeAs and Sr2VO3FeAs

Title
Possible role of bonding angle and orbital mixing in iron pnictide superconductivity: Comparative electronic structure studies of LiFeAs and Sr2VO3FeAs
Authors
Kim, YKKoh, YYKyung, WSHan, GRLee, BKim, KHOk, JMKim, JSArita, MShimada, KNamatame, HTaniguchi, MMo, SKKim, C
Date Issued
2015-07
Publisher
AMER PHYSICAL SOC
Abstract
A well-known universal feature among iron pnictide superconductors is the correlation between the As-Fe-As bonding angle and the superconducting transition temperature. However, the origin of such a correlation has not been clearly understood despite its potential importance in understanding the mechanism of superconductivity. Here, we present comparative electronic structure studies of LiFeAs and Sr2VO3FeAs, two representative systems without any dopant that can show bonding angle dependence of the electronic structure. Captured distinct features of the higher T-c compound Sr2VO3FeAs such as an unusual kz modulation and anomalous polarization dependence suggest that the difference between the two systems is in the interorbital coupling strength. This could be the essential element of the bonding angle dependence that allows an enhanced pairing instability and T-c.
URI
https://oasis.postech.ac.kr/handle/2014.oak/35570
ISSN
1098-0121
Article Type
Article
Citation
PHYSICAL REVIEW B, vol. 92, no. 4, 2015-07
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