TY - JOUR
T1 - A key for photoinduced insulator-metal transitions in manganites
T2 - Lattice constant matching between charge/orbital ordered insulator and ferromagnetic metal
AU - Matsubara, Masakazu
AU - Ogasawara, Takeshi
AU - Tomioka, Yasuhide
AU - Tobe, Katsuhiro
AU - Okamoto, Hiroshi
AU - Tokura, Yoshinori
PY - 2009/2
Y1 - 2009/2
N2 - 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 0:55Sr 0:45MnO 3 by the photocarrier-induced double exchange interaction, while delayed ferromagnetism occurs in Nd 0:5Sr 0:5MnO 3 through the thermalizations of the spin and lattice sectors with the charge sector. In Pr 0:55(Ca 0:8Sr 0:2) 0:45MnO 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.
AB - 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 0:55Sr 0:45MnO 3 by the photocarrier-induced double exchange interaction, while delayed ferromagnetism occurs in Nd 0:5Sr 0:5MnO 3 through the thermalizations of the spin and lattice sectors with the charge sector. In Pr 0:55(Ca 0:8Sr 0:2) 0:45MnO 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.
KW - Perovskite manganite
KW - Time-resolved magneto-optical Kerr effect
KW - Ultrafast spin dynamics
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U2 - 10.1143/JPSJ.78.023707
DO - 10.1143/JPSJ.78.023707
M3 - Article
AN - SCOPUS:60249092697
SN - 0031-9015
VL - 78
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 2
M1 - 023707
ER -