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J. Phys. Soc. Jpn. 78 (2009) 103706 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Observation of Magnetic Monopoles in Spin Ice

Hiroaki Kadowaki¹, Naohiro Doi¹, Yuji Aoki¹, Yoshikazu Tabata², Taku J. Sato³, Jeffrey W. Lynn⁴, Kazuyuki Matsuhira⁵, and Zenji Hiroi⁶

¹Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397
²Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501
³NSL, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106
⁴NCNR, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102, U.S.A.
⁵Department of Electronics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550
⁶Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581

(Received August 11, 2009; Accepted September 8, 2009; Published October 13, 2009)

Excitations from a strongly frustrated system, the kagomé ice state of the spin ice Dy₂Ti₂O₇ under magnetic fields along a [111] direction, have been studied. They are theoretically proposed to be regarded as magnetic monopoles. Neutron scattering measurements of spin correlations show that close to the critical point the monopoles are fluctuating between high- and low-density states, supporting that the magnetic Coulomb force acts between them. Specific heat measurements show that monopole-pair creation obeys an Arrhenius law, indicating that the density of monopoles can be controlled by temperature and magnetic field. ©2009 The Physical Society of Japan

KEYWORDS: magnetic monopole, spin ice, kagomé ice, neutron scattering, specific heat
URL: http://jpsj.ipap.jp/link?JPSJ/78/103706/
DOI: 10.1143/JPSJ.78.103706

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