| 查看: 159 | 回复: 1 | |||
| 当前主题已经存档。 | |||
csfn荣誉版主 (知名作家)
|
[交流]
【前沿】Observing Monopoles in a Magnetic Analog of Ice
|
||
|
Science 16 October 2009: Vol. 326. no. 5951, pp. 375 - 376 DOI: 10.1126/science.1181510 Physics: Observing Monopoles in a Magnetic Analog of Ice Michel J. P. Gingras A bar magnet has a north and south pole, and cutting it in half just creates two new poles, not two separated monopoles. However, a recent theoretical proposal suggested that defects in the spin alignment of certain oxide magnets can create separated effective magnetic monopoles (1). These materials are called spin ices because the lowest-energy orientation of the magnetic spins closely mimics the most stable arrangement of protons in water ice (2). On pages 415 and 411 of this issue, Fennell et al. (3) and Morris et al. (4) report measurements from neutron-scattering experiments showing that the low-energy excitations in spin ices are reminiscent of Dirac's elementary magnetic monopoles (5) that have so far eluded the searches of high-energy physicists. These dissociated north and south poles diffuse away from each other (6) in these oxides and leave behind a "Dirac string" of reversed spins that can be seen as patterns in the intensity of scattered neutrons. Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada, and Canadian Institute for Advanced Research/Quantum Materials Program, Toronto, Ontario MSG 1Z8, Canada. |
回复此楼» 猜你喜欢
售SCI一区文章，我:8.O.55.1.O.54,科目齐全,可伽急
已经有3人回复
-
售SCI一区文章，我:8.O.551.O.5.4,科目全,可伽急
已经有6人回复
-
明天应该可查了！？
已经有5人回复
-
如果此刻你正在为国基感到焦虑，不妨来听听这首《基金之外》
已经有7人回复
-
没有任何消息-是不是就凉了
已经有8人回复
-
售SCI-T0P文章，我:8O.5.5.1.O.54,科目齐全,可+急
已经有3人回复
-
人气不行了
已经有10人回复
-
我面上完蛋了
已经有10人回复
-
能否退出参与的面上项目解除限项
已经有24人回复
-
filecode，4个jtjc了
已经有17人回复
2楼2009-10-16 14:01:13
