Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Quantum-Critical Phenomena I
TT 50.2: Vortrag
Mittwoch, 14. März 2018, 09:45–10:00, H 3005
Close proximity of FeSe to a magnetic quantum critical point as revealed by high-resolution µSR measurements — •Vadim Grinenko1,2, Rajib Sarkar1, Philipp Materne1, Sirko Kamusella1, Aichi Yamashita3, Yoshihiko Takano3, Yue Sun4, Tsuyoshi Tamegai4, Dmitriy Efremov2, Stefan-Ludwig Drechsler2, Jean-Christophe Orain5, Tatsuo Goko5, Robert Scheuermann5, Hubertus Luetkens5, and Hans-Henning Klauss1 — 1Institute for Solid State and Material Physics, TU Dresden, 01069 Dresden, Germany — 2IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 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 — 5Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
We investigated FeSe single crystals using high-field (up to 9.5 T) muon spin rotation (µSR) measurements. We observed that the muon spin depolarization rate follows a critical behavior Λ2 ∝ T−3/4 in the temperature range Ts T 10 K. The scaling between Λ2 and the NMR 1/T1T suggests that Λ ∝ 1/T2 spin-spin relaxation rate. The observed non-Fermi liquid behavior with a cutoff at T* ∼ 10 K indicates that FeSe is close to a magnetic quantum critical point. The µSR Knight shift and the bulk susceptibility linearly scale at high temperatures but deviate from this behavior below T* where the Knight shift exhibits a kink. Our analysis shows a reduction of the density of states crossing the region near T* maybe related to a Lifshitz transition.