Monopolar and dipolar relaxation in spin ice Ho 2 Ti 2 O 7
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- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA., NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA.
- Faculty of Education, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan.
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA., Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA., Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan., Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan., Trans-scale Quantum Science Institute, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA., NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
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 Ho2Ti2O7 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.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0019331
- OSTI ID:
- 1797350
- Alternate ID(s):
- OSTI ID: 1816956
- Journal Information:
- Science Advances, Journal Name: Science Advances Vol. 7 Journal Issue: 25; ISSN 2375-2548
- Publisher:
- American Association for the Advancement of Science (AAAS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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