2017/10/26 by T. Kissikov, R. Sarkar, Rajib Sarkar +17
Chemistry · Materials Science · Mathematics · Physics and Astronomy · #Atomic orbital #Chemistry #Condensed matter physics #Electric field #Electric field gradient #Geometry #Iron-based superconductors research #Liquid crystal #Magnetic susceptibility #Materials science #Mathematics #Nuclear magnetic resonance #Paramagnetism #Phase (matter) #Physics #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity in MgB2 and Alloys #Tensor (intrinsic definition) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.241108
published as Phys. Rev. B 96, 241108 (2017) · 6 pages, 4 figures
arxiv created 2017/10/26 · openalex created_date 2017/11/10 · openalex publication_date 2017/12/19 · arxiv updated 2017/12/27 · openalex updated_date 2026/08/06
The electric field gradient (EFG) tensor at the 75As site couples to the orbital occupations of the As p orbitals and is a sensitive probe of local nematicity in BaFe2As2. We use nuclear magnetic resonance to measure the nuclear quadrupolar splittings and find that the EFG asymmetry responds linearly to the presence of a strain field in the paramagnetic phase. We extract the nematic susceptibility from the slope of this linear response as a function of temperature and find that it diverges near the structural transition, in agreement with other measures of the bulk nematic susceptibility. Our work establishes an alternative method to extract the nematic susceptibility which, in contrast to transport methods, can be extended inside the superconducting state.