PT  - JOURNAL ARTICLE
AU  - Fang, Zhong
AU  - Nagaosa, Naoto
AU  - Takahashi, Kei S.
AU  - Asamitsu, Atsushi
AU  - Mathieu, Roland
AU  - Ogasawara, Takeshi
AU  - Yamada, Hiroyuki
AU  - Kawasaki, Masashi
AU  - Tokura, Yoshinori
AU  - Terakura, Kiyoyuki
TI  - The Anomalous Hall Effect and Magnetic Monopoles in Momentum Space
AID  - 10.1126/science.1089408
DP  - 2003 Oct 03
TA  - Science
PG  - 92--95
VI  - 302
IP  - 5642
4099  - http://science.sciencemag.org/content/302/5642/92.short
4100  - http://science.sciencemag.org/content/302/5642/92.full
SO  - Science2003 Oct 03; 302
AB  - Efforts to find the magnetic monopole in real space have been made in cosmic rays and in particle accelerators, but there has not yet been any firm evidence for its existence because of its very heavy mass, ∼1016 giga–electron volts. We show that the magnetic monopole can appear in the crystal momentum space of solids in the accessible low-energy region (∼0.1 to 1 electron volts) in the context of the anomalous Hall effect. We report experimental results together with first-principles calculations on the ferromagnetic crystal SrRuO3 that provide evidence for the magnetic monopole in the crystal momentum space.