Doping-Driven Collapse of the SDW Correlation Gap in SmFeAsO_1-xF_x

2008/09/16 by Scott Riggs, R. McDonald, Riggs, Scott C. +19
Chemistry · Materials Science · #FOS: Physical sciences #Inorganic Fluorides and Related Compounds #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.0809.2820

openalex publication_date 2008/09/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report the Hall resistivity, ρ_xy of polycrystalline SmFeAsO_1-xF_x for four different fluorine concentrations from the onset of superconductivity through the collapse of the structural phase transition. For the two more highly-doped samples, ρ_xy is linear in magnetic field up to 50 T with only weak temperature dependence, reminiscent of a simple Fermi liquid. For the lightly-doped samples with x<0.15, we find a low temperature regime characterized ρ_xy(H) being both non-linear in magnetic field and strongly temperature dependent even though the Hall angle is small. The onset temperature for this non-linear regime is in the vicinity of the structural phase (SPT)/spin density wave (SDW) transitions. The temperature dependence of the Hall resistivity is consistent with a thermal activation of carriers across an energy gap. The evolution of the energy gap with doping is reported.

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