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Two-component heat ...
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Bielecki, Johan,1982Chalmers tekniska högskola, Göteborg,Chalmers University of Technology
(författare)
Two-component heat diffusion observed in LaMnO3 and La0.7Ca0.3MnO3
- Artikel/kapitelEngelska2010
Förlag, utgivningsår, omfång ...
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Americal Physical Society,2010
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:hj-12682
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https://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-12682URI
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https://doi.org/10.1103/PhysRevB.81.064434DOI
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https://research.chalmers.se/publication/118288URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:vet swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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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 och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Rauer, Ralf,1974Chalmers tekniska högskola, Göteborg,Chalmers University of Technology(Swepub:cth)rauer
(författare)
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Zanghellini, Ezio,1962Chalmers tekniska högskola, Göteborg,Chalmers University of Technology(Swepub:cth)zanghell
(författare)
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Gunnarsson, RobertJönköping University,Hållbar utveckling & naturvetenskapens didaktik,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)robertg
(författare)
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Dörr, KatherineInstitut für festkörper- und werkstofforschung, Dresden,Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Leibniz Institute for Solid State and Materials Research Dresden
(författare)
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Börjesson, Lars,1957Chalmers tekniska högskola, Göteborg,Chalmers University of Technology(Swepub:cth)lborje
(författare)
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Chalmers tekniska högskola, GöteborgChalmers tekniska högskola
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Physical Review B Condensed Matter: Americal Physical Society81:6, s. art. no. 064434-0163-18291095-3795
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Ingår i:Physical Review B - Condensed Matter and Materials Physics: Americal Physical Society81:6, s. art. no. 064434-2469-99502469-9969
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