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) |
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Hauptverfasser: | , , , , |
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. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.3068131 |