Two Component Heat Diffusion Observed in CMR Manganites

Details Two Component Heat Diffusion Observed in CMR Manganites Two Component Heat Diffusion Observed in CMR Manganites

2010-02-25

arxiv.org/abs/1002.4828v2

Physical Review B 81, 064434 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures http://link.aps.org/doi/10.1103/PhysRevB.81.064434 v2: Abstract corrected

Scientific paper

10.1103/PhysRevB.81.064434

We investigate the low-temperature electron, lattice, and spin dynamics of LaMnO_3 (LMO) and La_0.7Ca_0.3MnO_3 (LCMO) by resonant pump-probe reflectance spectroscopy. Probing the high-spin d-d transition as a function of time delay and probe energy, we compare the responses of the Mott insulator and the double-exchange metal to the photoexcitation. Attempts have previously been made to describe the sub-picosecond dynamics of CMR manganites in terms of a phenomenological three temperature model describing the energy transfer between the electron, lattice and spin subsystems followed by a comparatively slow exponential decay back to the ground state. However, conflicting results have been reported. Here we first show clear evidence of an additional component in the long term relaxation due to film-to-substrate heat diffusion and then develop a modified three temperature model that gives a consistent account for this feature. We confirm our interpretation by using it to deduce the bandgap in LMO. In addition we also model the non-thermal sub-picosecond dynamics, giving a full account of all observed transient features both in the insulating LMO and the metallic LCMO.

Affiliated with

Also associated with

No associations

Rating

Two Component Heat Diffusion Observed in CMR Manganites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Two Component Heat Diffusion Observed in CMR Manganites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two Component Heat Diffusion Observed in CMR Manganites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-380407