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Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Fluctuations, Noise, Magnetotransport, and Related Topics

TT 7.1: Talk

Monday, September 5, 2022, 15:00–15:15, H23

Large Hall and Nernst effect from chiral spin fluctuationsKamil K. Kolincio1, Max Hirschberger2,3, and •Jan Masell3,41Gdansk Tech, Gdansk, Poland — 2University of Tokyo, Tokyo, Japan — 3RIKEN CEMS, Wako, Japan — 4Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Magnetic materials with tilted electron spins exhibit conducting behaviour that is explained by the geometrical Berry phase, driven by a chiral (left- or right-handed) spin-habit. Dynamical and nearly random spin fluctuations, with a slight trent towards left- or right-handed chirality, represent a promising route to realizing Berry-phase phenomena at elevated temperatures. [1] Here, we report thermoelectric and electric transport experiments on a triangular and on a slightly distorted kagomé lattice material, respectively. We show that the impact of chiral spin fluctuations is strongly enhanced for the kagomé lattice. Our modelling shows that the geometry of the kagomé lattice plays a crucial role as it helps to avoid cancellation of Berry-phase contributions already in the disordered (paramagnetic) state. Hence, the observations for the kagomé material contrast with theoretical models treating magnetization as a continuous field, and emphasize the role of lattice geometry on emergent electrodynamic phenomena.

[1] K. K. Kolincio, M. Hirschberger, J. Masell, S. Gao, A. Kikkawa, Y. Taguchi, T.-h. Arima, N. Nagaosa, Y. Tokura, PNAS 118, e2023588118 (2021)

[2] K. K. Kolincio et al., submitted

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