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Observation of Magnetic Monopoles in Spin Ice

stringtheory 添加于 2009-9-20 10:36 | 1815 次阅读 | 0 个评论

作者
Kadowaki H, Doi N, Aoki Y, Tabata Y, Sato TJ, Lynn JW, Matsuhira K, Hiroi Z
摘要
From the symmetry of Maxwell's equations of electromagnetism as well as field theoretical arguments, magnetic charges or monopoles would be expected to exist. But magnetic monopoles have never been observed despite longstanding experimental searches. Recently, attention has turned to condensed matter systems where tractable analogs of magnetic monopoles might be found, and one prediction is for an emergent elementary excitation in the spin ice compound, where the strongly competing magnetic interactions exhibit the same type of frustration as water ice. We directly probe the monopoles in spin ice using neutrons, and show that they interact via the magnetic Coulomb force. Specific heat measurements show that the density of monopoles can be controlled by temperature and magnetic field, with the density following the expected Arrhenius law.
详细资料
- 关键词: cond-mat.dis-nn
- 文献种类:期刊
- 备注:arXiv:0908.3568v2; 16 pages, 4 figures, International Conference on Neutron Scattering 2009 (May 7)
标签

physics cond-mat
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