Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.6: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, HSZ 201

75As NMR under uniaxial pressure in BaFe2As2 — •Adam P. Dioguardi1, Tobias Schorr1, Clifford W. Hicks2, Saicharan Aswartham1, Sabine Wurmehl1, Bernd Büchner1,3, and Hans-Joachim Grafe11Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 3Institut für Festkörperphysik, TU Dresden, 01062 Dresden, Germany

We have conducted systematic 75As nuclear magnetic resonance (NMR) experiments in BaFe2As2 under 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. We find that uniaxial pressure increases, broadens, and separates the Néel temperature TN and the tetragonal-to-orthorhombic structural transition TS. Our spectral measurements in the magnetic state exhibit no evidence of a predicted spin reorientation for both positive and negative applied uniaxial pressure up to the point of sample failure.

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DPG-Physik > DPG-Verhandlungen > 2020 > Dresden