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Two-component heat diffusion observed in LaMnO3 and La0.7Ca0.3MnO3
Chalmers tekniska högskola, Göteborg.
Chalmers tekniska högskola, Göteborg.
Chalmers tekniska högskola, Göteborg.
Högskolan i Jönköping, Högskolan för lärande och kommunikation, HLK, Skolnära forskning, Hållbar utveckling & naturvetenskapens didaktik.
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2010 (engelsk)Inngår i: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 81, nr 6, s. 064434-Artikkel i tidsskrift (Annet vitenskapelig) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
Americal Physical Society , 2010. Vol. 81, nr 6, s. 064434-
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URN: urn:nbn:se:hj:diva-12682DOI: 10.1103/PhysRevB.81.064434OAI: oai:DiVA.org:hj-12682DiVA, id: diva2:326745
Tilgjengelig fra: 2010-06-24 Laget: 2010-06-24 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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