2024-03-29T14:19:02Z
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.
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
http://purl.org/coar/resource_type/c_6501
American Association for the Advancement of Science
2021-06-16
VoR
http://hdl.handle.net/20.500.12000/48586
2375-2548
Science Advances
25
7
eng
https://doi.org/10.1126/sciadv.abg0908
https://doi.org/10.1126/sciadv.abg0908
open access
© 2021 The Authors
Creative Commons Attribution4.0
https://creativecommons.org/licenses/by-nc/4.0/