Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 65(9): 393-401 (2016)

連載講座Serial Lecture

VI-1-2 Mn酸化物の磁気ダイナミクス—二重交換相互作用と軌道秩序—VI-1-2 Spin Dynamics in Manganese Oxides—Double-Exchange Interaction and Orbital Ordering—

1国立研究開発法人日本原子力研究開発機構J-PARCセンターJ-PARC Center, Japan Atomic Energy Agency ◇ 319–1195 茨城県那珂郡東海村大字白方2–4 ◇ 2–4 Shirakata, Tokai-mura, Naka-gun, Ibaraki Pref. 319–1195, Japan

2東京大学物性研究所The Institute for Solid State Physics, The University of Tokyo ◇ 319–1106 茨城県那珂郡東海村白方106–1 ◇ 106–1 Shirakata, Tokai-mura, Naka-gun, Ibaraki Pref. 319–1106, Japan

発行日:2016年9月15日Published: September 15, 2016


Manganese oxides with cubic perovskite structure, AMnO3, are famous materials where the so-called colossal magnetoresistance effect arises upon hole doping on Mn sites. The materials are regarded as a typical system where coupling of degrees of freedom of spin, orbital, and charge induces a variety of physical properties. The fundamental properties of this system and the typical magnetic and orbital orderings are briefly described. Inelastic neutron scattering studies of the spin waves to clarify the influence of the double-exchange interaction and the orbital orderings on the magnetic interactions are reviewed.

Key words: cubic perovskite manganese oxides; double-exchange interaction; orbital ordering; spin wave; inelastic neutron scattering

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