A Key for Photoinduced Insulator-Metal Transitions in Manganites : Lattice Constant Matching between Charge/Orbital Ordered Insulator and Ferromagnetic Metal(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We report comparative studies of photoinduced spin and charge dynamics in the three kinds of the charge/orbital ordered (CO/OO) manganites. By the irradiation of a femtosecond laser pulse, ultrafast ferromagnetism is induced in Gd_<0.55>Sr_<0.45>MnO_3 by the photocarrier-induced double exchange interaction, while delayed ferromagnetism occurs in Nd_<0.5>Sr_<0.5>MnO_3 through the thermalizations of the spin and lattice sectors with the charge sector. In Pr_<0.55>(Ca_<0.8>Sr_<0.2>)_<0.45>MnO_3, neither of the ultrafast nor delayed ferromagnetism was observed. Such differences between photoinduced magnetisms will be discussed in terms of the lattice-structural change between the CO/OO and ferromagnetic states.
社団法人日本物理学会の論文
2009-02-15