CrO_2の磁気輸送現象(磁性体物理)

概要

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When conduction electrons are strongly coupled to core spins, as in double-exchange systems, they acquire a quantum (Berry) phase while moving through a crystal and are affected by a gauge field, with the result that they produce an anomalous Hall effect. We measured the transport properties of CrO_2 as a pure double-exchange ferromagnet, and show that the experimental results for the anomalous Hall effect of CrO_2 are consistent with this Berry phase mechanism caused by topological spin defects. We also discuss the possibility of magnetoresistance resulting from such defects.
社団法人日本磁気学会の論文
2003-04-01