@article{oai:u-ryukyu.repo.nii.ac.jp:02012627,
 author = {Wang, Yishu and Reeder, T. and Karaki, Y. and Kindervater, J. and Halloran, T. and Maliszewskyj, N. and Qiu, Yiming and Rodriguez, J. A. and Gladchenko, S. and Koohpayeh, S. M. and Nakatsuji, S. and Broholm, C.},
 issue = {25},
 journal = {Science Advances},
 month = {Jun},
 note = {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},
 title = {Monopolar and dipolar relaxation in spin ice Ho_2Ti_2O_7},
 volume = {7},
 year = {2021}
}