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

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

  • Article/chapterEnglish2010

Publisher, publication year, extent ...

  • Americal Physical Society,2010
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:hj-12682
  • https://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-12682URI
  • https://doi.org/10.1103/PhysRevB.81.064434DOI
  • https://research.chalmers.se/publication/118288URI

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  • Language:English
  • Summary in:English

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  • Subject category:vet swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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.

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  • Rauer, Ralf,1974Chalmers tekniska högskola, Göteborg,Chalmers University of Technology(Swepub:cth)rauer (author)
  • Zanghellini, Ezio,1962Chalmers tekniska högskola, Göteborg,Chalmers University of Technology(Swepub:cth)zanghell (author)
  • Gunnarsson, RobertJönköping University,Hållbar utveckling & naturvetenskapens didaktik,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)robertg (author)
  • Dörr, KatherineInstitut für festkörper- und werkstofforschung, Dresden,Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Leibniz Institute for Solid State and Materials Research Dresden (author)
  • Börjesson, Lars,1957Chalmers tekniska högskola, Göteborg,Chalmers University of Technology(Swepub:cth)lborje (author)
  • Chalmers tekniska högskola, GöteborgChalmers tekniska högskola (creator_code:org_t)

Related titles

  • In:Physical Review B Condensed Matter: Americal Physical Society81:6, s. art. no. 064434-0163-18291095-3795
  • In:Physical Review B - Condensed Matter and Materials Physics: Americal Physical Society81:6, s. art. no. 064434-2469-99502469-9969

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