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|Title ||:||Monopolar and dipolar relaxation in spin ice Ho_2Ti_2O_7|
|Authors ||:||Wang, Yishu|
Rodriguez, J. A.
Koohpayeh, S. M.
|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.|
|Type Local ||:||雑誌掲載論文|
|Publisher ||:||American Association for the Advancement of Science|
|Citation ||:||Science Advances Vol.7 no.25 |
|Appears in Collections||:||Peer-reviewed Journal Articles (Faculty of Education)|
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