A key for photoinduced insulator-metal transitions in manganites: Lattice constant matching between charge/orbital ordered insulator and ferromagnetic metal

Masakazu Matsubara, Takeshi Ogasawara, Yasuhide Tomioka, Katsuhiro Tobe, Hiroshi Okamoto, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number023707
Journaljournal of the physical society of japan
Volume78
Issue number2
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Perovskite manganite
  • Time-resolved magneto-optical Kerr effect
  • Ultrafast spin dynamics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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