Nuclear magnetic resonance investigation of strain-tuned iron-based superconductors (Druckabhängige Untersuchung eisenbasierter Supraleiter mittels Kernspinresonanz)

2025/03/21 by A. P. Dioguardi, Dioguardi, Adam P.
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity in MgB2 and Alloys

paper · pdf · doi:10.48550/arxiv.2503.16805

openalex publication_date 2025/03/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Final report for a Deutsche Forschungsgemeinschaft, Eigenestelle Grant, summarizing work mainly on uniaxial-pressure-dependent nuclear magnetic resonance (NMR) investigations of BaFe₂As₂. We have conducted systematic ⁷⁵As NMR experiments in BaFe₂As₂ under in-situ controlled conditions of uniaxial pressure. We find that the electric field gradient (EFG), spin--lattice relaxation rate T₁^-1, spin--spin relaxation rate T₂^-1, and Knight shift K at the As site are sensitive to applied uniaxial pressure. These properties allow us to locally probe the nematic susceptibility, as well as orbital and spin degrees of freedom. Our spectral measurements in the magnetic state provide no evidence for spin reorientation below the T_N for both positive and negative applied uniaxial pressure up to the point of sample failure.

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