講演者： J. A. Fernandez-Baca氏（Oak Ridge National Laboratory）
日時： １１月　１４日（金）　午後４時３０分から
場所： 青山学院大学　理工学部（相模原キャンパス）Ｌ棟６階　Ｌ６０３室

題目： 「Microscopic Spin Interactions in the Metallic
       and Insulating Phases of the Colossal Magnetoresistance Manganites」

要旨：
Inelastic neutron scattering has been utilized to study microscopic
spin interactions in ferromagnetic La1-xCaxMnO3 (LCMO) as a function
of the hole-doping x (0.2, 0.25 and 0.30); and in ferromagnetic
Pr0.70Ca0.3MnO3 (PCMO) as a function of external magnetic field.
The evolution of the magnetic coupling in these systems as they 
undergo a metal-to-insulator transition is both surprising and 
inconsistent with existing models for these materials such as 
Heisenberg ferromagnetism, double-exchange or modified double-exchange. 
These results will be discussed in this talk.

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共催：　青山学院大学　２１世紀COEプログラム