Work

Effective exchange interactions for bad metals and implications for iron-based superconductors

Year: 2019

Type: article

Abstract: The experimentally observed bad-metal behavior in parent iron pnictides and chalcogenides suggests that these systems contain strong electronic correlations and are on the verge of a metal-to-insulator transition. The magnetic excitations in this bad-metal regime mainly derive from the incoherent part of the electronic spectrum away from the Fermi energy. We present a microscopic study of the exchange interactions in such a regime within a slave rotor approach. We find that the exchange interaction is maximized near the Mott transition. Generalizations to the multiorbital case are discussed, as are the implications for the strength of superconducting pairing amplitude in iron-based superconductors.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.100.235113

Authors: Wenxin Ding, Rong Yu, Qimiao Si, Elihu Abrahams

Institutions: Anhui University, Rice University, Renmin University of China, University of California, Los Angeles

Language: English

Topic: Iron-based superconductors research

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green