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Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Superconductivity: Fe-based Superconductors - 122 and Theory

TT 35.7: Vortrag

Dienstag, 13. März 2018, 11:00–11:15, A 053

Interplay of magnetism and superconductivity in the triclinic Ca10Pt3As8(Fe1−xPtxAs)10 system — •Felix Brückner1, Vadim Grinenko1, Rajib Sarkar1, Maksym Surmach1, Hubertus Luetkens2, Dmytro Inosov1, and Hans-Henning Klauss11Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany — 2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen, Switzerland

Among iron-based superconductors, Ca10Pt3As8(Fe1−xPtxAs)10 is the first system with a triclinic crystal structure. The usually tetragonal symmetry of the characteristic FeAs layers is slightly distorted by insertion of a skutterudite-like interlayer.

We report comprehensive studies of magnetic probe experiments including 75As and 195Pt nuclear magnetic resonance (NMR), muon spin rotation and inelastic neutron scattering (INS). Broadening of NMR spectra below T ∼ 45 K provides evidence for static magnetic correlations far above the superconducting Tc = 13 K. At T, a sudden drop of the spin-lattice relaxation rate, that is insensitive to external magnetic field up to 30 T, is observed. INS spectra exhibit a resonant mode at higher energies just below T. This was previously interpreted as a manifestation of preformed cooper pairs, which can be ruled out by 195Pt Knight-shift experiments. Furthermore an additional magnetic transition at 3 K and strong but slow magnetic fluctuations peaking at ∼ 120 K are detected by NMR. In addition to the magnetic probe investigations, we compare our results with transport measurements and specific heat studies.

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