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Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
Research Institute for Interdisciplinary Science, Okayama University, Okayama, Okayama 700-8530, Japan, Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan, Division of Natural and Environmental Science, The Open University of Japan, Mihama, Chiba 261-8586, Japan
Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan, Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan, Faculty of Engineering, Kyusyu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan
Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan, Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
Research Institute for Interdisciplinary Science, Okayama University, Okayama, Okayama 700-8530, Japan, Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, Center for Chiral Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
抄録
We have performed X-band electron spin resonance (ESR) measurements on a single crystal of the metallic chiral helimagnet CrNb3S6 from 3.5 to 180 K and for the external magnetic fields Hext , up to 4 kOe, perpendicular to the c axis (the helical axis of CrNb3S6). This field-crystalline configuration is expected to provide the chiral soliton lattice (CSL) state in this system. The main resonance line can be fit with a Dysonian function above Tc = 127 K, but additional features in the spectra were observed below 105 K. Specifically, spiked anomalies superposed on the main signals were observed for magnetic fields between Hc1 and Hc2 that are the appearing and disappearing fields of the spiked anomalies, respectively. The resulting magnetic field vs temperature phase diagram possesses three regions, which are interpreted as different dynamical responses in the CSL phase. In addition, the values of Hc2 are close to those reported by the d2M/dH2 curve [Tsuruta et al., Phys. Rev. B 93, 104402 (2016)]. Furthermore, the field range between Hc1 and Hc2, where the spiked anomalies exist, depends on the field direction and shifts to higher fields when turning to the c axis, thereby providing additional evidence that these spiked anomalies must be related to the chiral soliton dynamics.
Anomalous spiked structures in ESR signals from the chiral helimagnet CrNb3S6
scunit-2020_06.pdf
(1.19MB)
