Magnetotransmission spectra in La0.7Pb0.3MnO3−δ epitaxial thin film with colossal magnetoresistance effect

The magnetorefractive effect in transmission modes (MT-MRE) of epitaxial grown La0.7Pb0.3MnO3−δ was measured and studied. The studied film had a colossal magnetoresistance value up to 80% (at 5.5 tesla) at room temperature. In addition, the MT-MRE spectra in the range of 350–15 000 cm−1 in magnetic...

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Veröffentlicht in:Journal of applied physics 2009-04, Vol.105 (7)
Hauptverfasser: Malak, Sidney T., Clayton-Cox, Ryan, Scheuermann, James R., Stehlik, Jiri, Wang, Jian-Qing
Format: Artikel
Sprache:eng
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Zusammenfassung:The magnetorefractive effect in transmission modes (MT-MRE) of epitaxial grown La0.7Pb0.3MnO3−δ was measured and studied. The studied film had a colossal magnetoresistance value up to 80% (at 5.5 tesla) at room temperature. In addition, the MT-MRE spectra in the range of 350–15 000 cm−1 in magnetic fields up to 1.0 tesla were obtained, and it was observed that the MT-MRE scaled proportionally with the applied magnetic field and was largest at lower frequencies below 3000 cm−1. The maximum observed MT-MRE value was 4.0% at 1.0 tesla. Beyond far infrared (FIR) range, the MT-MRE curves monotonically decrease with frequency until the effect vanishes at 11 400 cm−1. Such crossover of magnetospectroscopic responses from FIR to near IR frequencies is the first evidence of gradual disappearance of the magnetodynamics at higher frequencies, resulting from the dynamic Jahn–Teller effect.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3068131