Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Poster Session: Topological Topics
TT 28.1: Poster
Montag, 12. März 2018, 15:00–19:00, Poster B
Emergent Weyl fermion bulk excitations in TaP and NbP evidenced from solid state NMR and NQR — H. Yasuoka1, K.M. Ranjith1, T. Kubo1,2, Y. Kishimoto1,2, D. Kasinathan1, M. Schmidt1, B. Yan1, H. Tou2, C. Felser1, A.P. Mackenzie1, and •M. Baenitz1 — 1MPI for Chemical Physics of Solids, 01187 Dresden, Germany — 2Department of Physics, Graduate school of Science, Kobe University, Kobe, 657-8501 Japan
The monophosphides TaP and NbP belong the class of Weyl semi metals and exhibit a non centrosymmetric structure and sizable spin orbit coupling. A crossing of linearly dispersive topologically protected polarized bands at a single point in reciprocal space defines the Weyl
node where the fermion mass vanishes theoretically and a giant orbital hyperfine coupling is expected [1]. 181Ta quadrupole resonance(NQR) resolves three NQR lines associated with the split level transitions for the I = 7/2 Ta nuclear spin. The spin lattice relaxation violates the Korringa law and shows a pronounced (1/T1T) ∝ T2 behaviour [2] which is assigned to the magnetic excitations of the Weyl fermions, in agreement with theoretical predictions [1]. In addition we present first 93Nb NMR results from NbP single crystals. Here we investigated the anisotropic hyperfine interaction and the excitations of the I = 9/2 Nb nuclear spin.
Z. Okvatovity et al., PRB 94 (2016)
Y. Yasuoka et al., PRL 118 (2017)