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Two-component heat ...
Two-component heat diffusion observed in LaMnO3 and La0.7Ca0.3MnO3
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- Bielecki, Johan, 1982 (författare)
- Chalmers tekniska högskola, Göteborg,Chalmers University of Technology
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- Rauer, Ralf, 1974 (författare)
- Chalmers tekniska högskola, Göteborg,Chalmers University of Technology
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- Zanghellini, Ezio, 1962 (författare)
- Chalmers tekniska högskola, Göteborg,Chalmers University of Technology
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- Gunnarsson, Robert (författare)
- Jönköping University,Hållbar utveckling & naturvetenskapens didaktik,Chalmers tekniska högskola,Chalmers University of Technology
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- Dörr, Katherine (författare)
- Institut für festkörper- und werkstofforschung, Dresden,Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Leibniz Institute for Solid State and Materials Research Dresden
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- Börjesson, Lars, 1957 (författare)
- Chalmers tekniska högskola, Göteborg,Chalmers University of Technology
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(creator_code:org_t)
- Americal Physical Society, 2010
- 2010
- Engelska.
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Ingår i: Physical Review B Condensed Matter. - : Americal Physical Society. - 0163-1829 .- 1095-3795. ; 81:6, s. art. no. 064434-
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Condensed matter physics
- Kondenserade materiens fysik
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