O ct 2 02 1 Observation of topological Z 2 vortex fluctuations in the frustrated Heisenberg magnet NaCrO

K. Tomiyasu, 2, ∗ Y. P. Mizuta, M. Matsuura, K. Aoyama, and H. Kawamura † Department of Physics, Tohoku University, Aoba, Sendai 980-8578, Japan Nissan ARC Ltd., Natsushima-cho 1, Yokosuka 237-0061, Japan Graduate School of Engineering science, Osaka University, Toyonaka, Osaka 560-8531, Japan CROSS Neutron Science and Technology Center, IQBRC Bldg, Tokai, Ibaraki 319-1106, Japan Department of Earth and Space Science, Graduate School of Science, Osaka University, Osaka 560-0043, Japan Molecular Photoscience Research Center, Kobe University, Kobe, 657-8501, Japan (Dated: November 1, 2021)