2024-03-29T15:13:08Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02012627
2023-08-03T05:27:02Z
1642838163960:1642838338003
1642838403551:1642838405037
Monopolar and dipolar relaxation in spin ice Ho_2Ti_2O_7
Wang, Yishu
Reeder, T.
Karaki, Y.
Kindervater, J.
Halloran, T.
Maliszewskyj, N.
Qiu, Yiming
Rodriguez, J. A.
Gladchenko, S.
Koohpayeh, S. M.
Nakatsuji, S.
Broholm, C.
open access
© 2021 The Authors
Creative Commons Attribution4.0
https://creativecommons.org/licenses/by-nc/4.0/
Ferromagnetically interacting Ising spins on the pyrochlore lattice of corner-sharing tetrahedra form a highly degenerate manifold of low-energy states. A spin flip relative to this “spin-ice” manifold can fractionalize into two oppositely charged magnetic monopoles with effective Coulomb interactions. To understand this process, we have probed the low-temperature magnetic response of spin ice to time-varying magnetic fields through stroboscopic neutron scattering and SQUID magnetometry on a new class of ultrapure Ho_2Ti_2O_7 crystals. Covering almost 10 decades of time scales with atomic-scale spatial resolution, the experiments resolve apparent discrepancies between prior measurements on more disordered crystals and reveal a thermal crossover between distinct relaxation processes. Magnetic relaxation at low temperatures is associated with monopole motion through the spin-ice vacuum, while at elevated temperatures, relaxation occurs through reorientation of increasingly spin-like monopolar bound states. Spin fractionalization is thus directly manifest in the relaxation dynamics of spin ice.
論文
American Association for the Advancement of Science
2021-06-16
eng
journal article
VoR
http://hdl.handle.net/20.500.12000/48586
http://hdl.handle.net/20.500.12000/48586
https://u-ryukyu.repo.nii.ac.jp/records/2012627
https://doi.org/10.1126/sciadv.abg0908
https://doi.org/10.1126/sciadv.abg0908
2375-2548
Science Advances
7
25
https://u-ryukyu.repo.nii.ac.jp/record/2012627/files/柄木良友-10118685-Monopolar.pdf