Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 Büchner^1,3, and Hans-Joachim Grafe¹ — ¹Leibniz 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 T_N and the tetragonal-to-orthorhombic structural transition T_S. 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.