Magnetotransmission spectra in La0.7Pb0.3MnO3−δ epitaxial thin film with colossal magnetoresistance effect
Magnetotransmission spectra in La0.7Pb0.3MnO3−δ epitaxial thin film with colossal magnetoresistance effect
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DOI：
10.1063/1.3068131
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发表时间：
2009-04
影响因子：
3.2
通讯作者：
Sidney T. Malak;Ryan Clayton-Cox;J. Scheuermann;J. Stehlík;Jian-qing Wang
中科院分区：
文献类型：
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作者：
Sidney T. Malak;Ryan Clayton-Cox;J. Scheuermann;J. Stehlík;Jian-qing Wang
测量和研究了外延生长的La 0.7Pb 0.3MnO 3 −δ的透射模磁折射效应（MT-MRE）。所研究的薄膜在室温下具有高达80%（在5.5特斯拉）的巨磁电阻值。此外，在高达1.0特斯拉的磁场中，获得了350- 15000 cm−1范围内的MT-MRE光谱，并观察到MT-MRE与所施加的磁场成比例，并且在低于3000 cm−1的较低频率下最大。在1.0特斯拉下观察到的最大MT-MRE值为4.0%。在远红外（FIR）范围之外，MT-MRE曲线随频率单调下降，直到效应在11400 cm−1处消失。从FIR到近IR频率的磁光谱响应的这种交叉是在较高频率下由动态Jahn-Teller效应引起的磁动力学逐渐消失的第一个证据。
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.