Ultrafast optical and magneto-optical dynamics in colossal-magnetoresistance (CMR) manganites
Acta physica Polonica : Acta Phys. Pol. A. Bd. 107. H. 1. 2005 S. 211 - 214
Erscheinungsjahr: 2005
ISBN/ISSN: 0587-4246
Publikationstyp: Zeitschriftenaufsatz (Konferenzbeitrag)
Sprache: Englisch
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Inhaltszusammenfassung
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 increase...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.» weiterlesen» einklappen
Klassifikation
DFG Fachgebiet:
Physik der kondensierten Materie
DDC Sachgruppe:
Physik
