Ultrafast photoinduced reflectivity transients in $(Nd_{0.5}Sr_{0.5})MnO_3$

Details Ultrafast photoinduced reflectivity transients in $(Nd_{0.5}Sr_{0.5})MnO_3$ Ultrafast photoinduced reflectivity transients in $(Nd_{0.5}Sr_{0.5})MnO_3$

2003-09-15

arxiv.org/abs/cond-mat/0309343v1

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevB.68.125112

The temperature dependence of ultrafast photoinduced reflectivity transients is reported in Nd$_{0.5}$Sr$_{0.5}$MnO$_{3}$ thin film. The photoinduced reflectivity shows a complex response with very different temperature dependences on different timescales. The response on the sub-ps timescale appears to be only weakly sensitive to the 270K-metal-insulator phase transition. Below $\sim 160$ K the sub-ps response displays a two component behavior indicating inhomogeneity of the film resulting from the substrate induced strain. On the other hand, the slower response on the 10-100 ps timescale is sensitive only to the metal-insulator phase transition and is in agreement with some previously published results. The difference in the temperature dependences of the responses on nanosecond and $\mu $s timescales indicates that thermal equilibrium between the different degrees of fredom is established relatively slowly - on a nanosecond timescale.

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