In:
physica status solidi c, Wiley, Vol. 6, No. 1 ( 2009-01), p. 252-255
Abstract:
The ultrafast dynamics of photoinduced phase transition (PIPT) in a crystal of Pr 1– x Ca x MnO 3 ( x = 0.37) has been studied by means of femtosecond time‐resolved spectroscopy. Just after photoirradiation of 1.58 eV light at 100 K, ultrafast change of reflectivity (Δ R/R ) was observed within ∼1 ps utilizing the probe light of 0.5 eV due to the ferromagnetic metallic phase transition. While the fast component of Δ R/R gradually increases with increasing the excitation intensity, the slow component observed at the delay time of ∼1 ps shows unusual dependence on the excitation intensity. The signature of Δ R/R changes from negative to positive with the excitaiton power, which cannot be explained by the photo‐thermal heating effect. In addition, we investigated the temperature dependence of the Δ R/R at 0.5 eV and observed the sudden change of Δ R/R around T N , which indicates that the efficiency of PIPT is closely correlated with the ordering of spin and extra electron in Mn 4+ . (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Type of Medium:
Online Resource
ISSN:
1862-6351
,
1610-1642
DOI:
10.1002/pssc.200879884
Language:
English
Publisher:
Wiley
Publication Date:
2009
detail.hit.zdb_id:
2105580-4
detail.hit.zdb_id:
2102966-0