Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-05-25
EPL 86, 57003 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
accepted in EPL
Scientific paper
10.1209/0295-5075/86/57003
The time resolved Magnetooptical Kerr effect in the substrate-strain-induced insulating ferromagnetic phase in (Pr$_{0.6}$Ca$_{0.4}$)MnO$_3$ thin films on two different substrates was measured in a magnetic field up to 1.1T. The photoinduced Kerr rotation and ellipticity show remarkably different magnetic-field dependence. From the comparison of the magnetic field dependencies of the photoinduced and static Kerr rotation and ellipticity we conclude that a transient ferromagnetic metallic phase, embedded within the insulating ferromagnetic phase, is created upon the photoexcitation at low temperatures. A comparison of temporal dependence of the photoinduced Kerr signals with the photoinduced reflectivity indicates the change of the fractions of the phases takes place on a timescale of ten picoseconds independent of the substrate.
Filippi Massimiliano
Gradisek A.
Mertelj T.
Mihailovic Dragan
Prellier Wilfrid
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