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Title :Monopolar and dipolar relaxation in spin ice Ho_2Ti_2O_7
Authors :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.
Issue Date :16-Jun-2021
Abstract :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.
URL :https://doi.org/10.1126/sciadv.abg0908
Type Local :雑誌掲載論文
ISSN :2375-2548
Publisher :American Association for the Advancement of Science
URI :http://hdl.handle.net/20.500.12000/48586
Citation :Science Advances Vol.7 no.25
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Education)

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