Eur. Phys. J. B (2016) 89: 119
https://doi.org/10.1140/epjb/e2016-60842-y

Regular Article

Normal state incoherent pseudogap in FeSe superconductor

¹ Instituto de Física, Universidade Federal de Mato Grosso, 78060-900 Cuiabá, MT, Brazil
² The Institute of Mathematical Sciences, C.I.T. Campus, 600 113 Chennai, India

^a e-mail: lcraco@fisica.ufmt.br

Received: 23 October 2015
Received in final form: 2 February 2016
Published online: 12 May 2016

Abstract

The normal state of Iron chalcogenide superconductors show a range of unconventional features. Bad-metallic resistivity and proximity to insulating state manifest themselves in spectral and transport responses. In particular, obervation of low-energy pseudogap feature in the normal state raises the issue of the nature of processes underpinning its emergence as well as its relation to unconventional superconductivity. Here, using the LDA+DMFT method, we show how correlation-induced orbital-selective pseudogap-like physics underpin these incoherent features in stoichimetric and electron-doped FeSe superconductor. We discuss the pseudogap regime microscopically, along with implications for the superconductive instability.