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TT: Fachverband Tiefe Temperaturen
TT 19: Superconductivity: Poster Session
TT 19.23: Poster
Monday, March 7, 2016, 15:00–18:00, Poster D
Dynamic properties of Ca10(Pt3As8)(Fe1−xPtxAs)10 in the superconducting state explored by NMR in high fields — •Felix Brückner1, Rajib Sarkar1, Arneil P. Reyes2, Philip L. Kuhns2, Maksym Surmach1, Dmytro Inosov1, and Hans-Henning Klauss1 — 1Institut für Festkörperphysik, TU Dresden, Dresden, Germany — 2National High Magnetic Field Laboratory, Tallahassee, Florida, USA
The triclinic iron-based superconductor Ca10(Pt3As8)(Fe1−xPtxAs)10 with a Tc of 13 K exhibits a unique pseudogap phase below T* = 45 K, recently probed with inelastic neutron scattering. This phase has been attributed to a possible preformation of Cooper pairs. We present detailed NMR results, including 75As and 195Pt spectra as well as T1 measurements. These experiments reveal a drop of spin fluctuations just below T* with a hysteresis in temperature, associated with the emergence of the pseudogap phase. Interestingly, no anomaly at Tc is found. At 3 K, a peak in the T1 relaxation rate appears, until 1/T1 eventually vanishes at lower temperatures. This behavior is persistent in large magnetic fields up to 17 T. To interpret these results, scenarios including magnetic order below T* are quite unprobable, since Korringa law is well complied at higher temperatures and no magnetic order is found in µSR. However, the origin of the unique behavior remains unclear for now.