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Instytut Podstaw Informatyki, Acta Physica Polonica A, 1(107), p. 211-214, 2005

DOI: 10.12693/aphyspola.107.211

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Ultrafast Optical and Magneto-Optical Dynamics {in Colossal-Magnetoresistance Manganites}

Journal article published in 2005 by V. Dorosinets, P. Richter, G. Jakob ORCID, Hg G. Roskos
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Transient pump-probe reflectance measurements on La0.67Ca0.33MnO3/MgO and La0.67 Ca0.33MnO3/SrTiO3 thin films reveal a hitherto unknown magnetization-dependent energy gap that determines the relaxation process of the optically excited charge carriers on the picosecond time scale. In the case of La0.67Ca0.33MnO3/SrTiO3, the subsequent reflectance dynamics at low temperatures is determined to be substrate-induced strain that drives the sample into a metastable state characterized by an increased number of paramagnetic domains.