TY - JOUR
T1 - Direct observations of spin fluctuations in hedgehog-anti-hedgehog spin lattice states in MnSi1-x Gex (x=0.6 and 0.8) at zero magnetic field
AU - Aji, Seno
AU - Oda, Tatsuro
AU - Fujishiro, Yukako
AU - Kanazawa, Naoya
AU - Saito, Hiraku
AU - Endo, Hitoshi
AU - Hino, Masahiro
AU - Itoh, Shinichi
AU - Arima, Taka Hisa
AU - Tokura, Yoshinori
AU - Nakajima, Taro
N1 - Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/8/1
Y1 - 2023/8/1
N2 - The helimagnetic compounds MnSi1-xGex show the three-dimensional multiple-q order referred to as hedgehog-anti-hedgehog spin lattice (HSL) states. Two representative forms of HSL are the cubic-3q spin lattice with q∥(100) and the tetrahedral-4q spin lattice with q∥(111), which show up typically for x=1.0-0.8 and 0.6, respectively. Here, we have investigated the spin fluctuations in the MnSi1-xGex polycrystalline samples with x=0.6 and 0.8 by using the time-of-flight neutron inelastic scattering and modulated intensity with zero effort type of neutron spin-echo techniques to elucidate the microscopic origin of the unconventional Hall effect in the HSL states. This research is motivated by the observation of a sign change in the unconventional Hall resistivity as a function of temperature [Y. Fujishiro, N. Kanazawa, T. Nakajima, X. Z. Yu, K. Ohishi, Y. Kawamura, K. Kakurai, T. Arima, H. Mitamura, A. Miyake, K. Akiba, M. Tokunaga, A. Matsuo, K. Kindo, T. Koretsune, R. Arita, and Y. Tokura, Nat. Commun. 10, 1059 (2019)2041-172310.1038/s41467-019-08985-6]. The present results reveal the correspondences between the temperature ranges where the positive Hall resistivity and spin fluctuations are observed. These results agree well with the theoretical model of the conduction electrons scattered by the fluctuating spin clusters with a nonzero average of sign-biased scalar spin chirality as a mechanism of the positive Hall resistivity [H. Ishizuka and N. Nagaosa, Sci. Adv. 4, eaap9962 (2018)2375-254810.1126/sciadv.aap9962].
AB - The helimagnetic compounds MnSi1-xGex show the three-dimensional multiple-q order referred to as hedgehog-anti-hedgehog spin lattice (HSL) states. Two representative forms of HSL are the cubic-3q spin lattice with q∥(100) and the tetrahedral-4q spin lattice with q∥(111), which show up typically for x=1.0-0.8 and 0.6, respectively. Here, we have investigated the spin fluctuations in the MnSi1-xGex polycrystalline samples with x=0.6 and 0.8 by using the time-of-flight neutron inelastic scattering and modulated intensity with zero effort type of neutron spin-echo techniques to elucidate the microscopic origin of the unconventional Hall effect in the HSL states. This research is motivated by the observation of a sign change in the unconventional Hall resistivity as a function of temperature [Y. Fujishiro, N. Kanazawa, T. Nakajima, X. Z. Yu, K. Ohishi, Y. Kawamura, K. Kakurai, T. Arima, H. Mitamura, A. Miyake, K. Akiba, M. Tokunaga, A. Matsuo, K. Kindo, T. Koretsune, R. Arita, and Y. Tokura, Nat. Commun. 10, 1059 (2019)2041-172310.1038/s41467-019-08985-6]. The present results reveal the correspondences between the temperature ranges where the positive Hall resistivity and spin fluctuations are observed. These results agree well with the theoretical model of the conduction electrons scattered by the fluctuating spin clusters with a nonzero average of sign-biased scalar spin chirality as a mechanism of the positive Hall resistivity [H. Ishizuka and N. Nagaosa, Sci. Adv. 4, eaap9962 (2018)2375-254810.1126/sciadv.aap9962].
UR - http://www.scopus.com/inward/record.url?scp=85172686709&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.108.054445
DO - 10.1103/PhysRevB.108.054445
M3 - Article
AN - SCOPUS:85172686709
SN - 2469-9950
VL - 108
JO - Physical Review B
JF - Physical Review B
IS - 5
M1 - 054445
ER -