Two-Dimensional Monopole Dynamics in the Dipolar Spin Ice Dy
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概要
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The spin dynamics of the dipolar spin-ice Dy<inf>2</inf>Ti<inf>2</inf>O<inf>7</inf>under a dc magnetic field (B_{\text{dc}}) along the [111] direction has been investigated using ac susceptibility (\chi_{\text{ac}}), which enables us to study two-dimensional monopole motion in an ac magnetic field perpendicular to B_{\text{dc}}. We have observed the slowing down of monopole dynamics in the kagomé spin-ice regime (B_{\text{dc}}\sim 0.4 T) and the extreme speeding up under B_{\text{dc}} close to the critical point (B_{\text{dc}}\sim 0.93 T). An analysis using a Monte Carlo simulation suggests that the dynamics changes from a random walk of monopoles to a collective motion as B_{\text{dc}} increases.
- 2013-07-15
著者
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Takatsu Hiroshi
Department Of Physics Graduate School Of Science Kyoto University
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Uwatoko Yoshiya
Institute For Solid State Physics (issp) The University Of Tokyo
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Kadowaki Hiroaki
Department Of Physics Graduate School Of Science Tokyo Metropolitan University
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Higashinaka Ryuji
Department Of Physics Kyoto University
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Goto Kazuki
Departments of Orthopaedic Surgery Osaka Rosai Hospital
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Otsuka Hiromi
Department Of Orthopaedics Aichi Medical University
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Uwatoko Yoshiya
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Matsubayashi Kazuyuki
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Otsuka Hiromi
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Uwatoko Yoshiya
Institute for Solid State Physics
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