Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Superconductivity: Fe-based Superconductors - FeSe and others
TT 59.4: Vortrag
Donnerstag, 23. März 2017, 10:15–10:30, HSZ 103
Short-range quasi-static correlations in FeSe single crystals probed by µSR — •Vadim Grinenko1, Rajib Sarkar1, Philipp Materne1, Sirko Kamusella1, Hubertus Luetkens2, Jean-Christophe Orain2, Tatsuo Goko2, Robert Scheuermann2, Aichi Yamashita3, Yoshihiko Takano3, Yue Sun4, Tsuyoshi Tamegai4, Dmitriy Efremov5, Stefan-Ludwig Drechsler5, and Hans-Henning Klauss1 — 1Institute for Solid State Physics, TU Dresden, D-01069, Germany — 2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland — 3National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0047 JAPAN, Japan — 4Department of Applied Physics, The University of Tokyo, Hongo, Tokyo 113-8656, Japan — 5IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany
The FeSe system is an exception among the Fe based superconductors since it has a nematic transition at Ts ∼ 90 K without long-range magnetic order down to lowest temperatures. The understanding of this phenomenon is a big challenge for a microscopic theory. We investigated high-quality single crystals of FeSe using zero field and high field muon spin rotation/relaxation (µSR) measurements. We observed that weak quasi-static local magnetic fields appear below 200 K in the entire sample volume. The static field inhomogeneity increases with the reduction of the temperature down to T*∼ 75 K, where the transition to another magnetic state is observed. The evidence for the short-range quasi-static magnetic correlations well above Ts in FeSe provides a strong constraint for future microscopic theories.