2010/01/19 by L. Craco, Craco, L., M. S. Laad +1
Materials Science · #FOS: Physical sciences #Heusler alloys: electronic and magnetic properties #Iron-based superconductors research #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.1001.3273
openalex publication_date 2010/01/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The normal state of the recently discovered Iron Selenide (FeSe)-based superconductors shows a range of inexplicable features. Along with bad-metallic resistivity, characteristic pseudogap features and proximity to insulating states, reminiscent of the underdoped high-Tc cuprates, mark these systems as strongly correlated non-Fermi Liquid metals. Here, using the first-principles LDA+DMFT method, we show how strong multi-orbital correlation-induced orbital-selective Mott-like physics leads to an orthogonality catastrophe underpinning these inexplicable incoherent features. Excellent agreement with a range of resistivity and Seebeck data strongly support our proposal. We discuss pseudogap regime microscopically, along with implications for the nature of the instability at lower T, and propose that related systems could be of use in thermoelectric devices.