Two-component heat diffusion observed in LaMnO3 and La0.7Ca0.3MnO3

Bielecki, Johan, 1982 (author): Chalmers tekniska högskola, Göteborg,Chalmers University of Technology

Rauer, Ralf, 1974 (author): Chalmers tekniska högskola, Göteborg,Chalmers University of Technology

Zanghellini, Ezio, 1962 (author): Chalmers tekniska högskola, Göteborg,Chalmers University of Technology

Gunnarsson, Robert (author): Jönköping University,Hållbar utveckling & naturvetenskapens didaktik,Chalmers tekniska högskola,Chalmers University of Technology

Dörr, Katherine (author): Institut für festkörper- und werkstofforschung, Dresden,Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Leibniz Institute for Solid State and Materials Research Dresden

Börjesson, Lars, 1957 (author): Chalmers tekniska högskola, Göteborg,Chalmers University of Technology

(creator_code:org_t)

Americal Physical Society, 2010
2010
English.
In: Physical Review B Condensed Matter. - : Americal Physical Society. - 0163-1829 .- 1095-3795. ; 81:6, s. art. no. 064434-

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Abstract Subject headings

We investigate the low-temperature electron, lattice, and spin dynamics of LaMnO3 (LMO) and La0.7Ca0.3MnO3 (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 subpicosecond dynamics of colossal magnetoresistance 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 band gap in LMO. In addition, we also model the nonthermal subpicosecond dynamics, giving a full account of all observed transient features both in the insulating LMO and the metallic LCMO.

By the author/editor: Bielecki, Johan, ...; Rauer, Ralf, 197 ...; Zanghellini, Ezi ...; Gunnarsson, Robe ...; Dörr, Katherine; Börjesson, Lars, ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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