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首页> 外文期刊>Solid State Communications >Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7
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Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

机译：双层锰La1.24Sr1.76Mn2O7中铁磁和顺磁相的瞬态微分反射率

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摘要

Photoinduced effects in a single crystal of bilayered manganites, La2-2xSr1+2xMn2O7 (x = 0.38), were investigated in a wide range of temperatures by pump-probe measurement at a photon energy of 1.6 eV. In a ferromagnetic metallic state, significant enhancement of positive rise in differential reflectivity with a slow relaxing time of 100 ps was observed just below T-C = 127 K, indicating that the reflectivity change with the slow relaxation time constant is induced by laser heating. We have also observed an unconventional fast relaxing component that has a time constant of the order of 10 ps. This fast relaxing component, whose absolute value has an asymmetric peak at T-C, is presumably due to short-range correlation of Jahn-Teller distortion. (C) 2004 Elsevier Ltd. All rights reserved.
机译：在1.6 eV的光子能量下，通过泵浦探针测量，在较宽的温度范围内研究了双层锰酸盐La2-2xSr1 + 2xMn2O7（x = 0.38）单晶中的光诱导效应。在铁磁金属状态下，仅在T-C = 127 K以下，观察到微分反射率正上升的显着增强，并具有100 ps的缓慢弛豫时间，这表明反射率随弛豫时间常数的变化是由激光加热引起的。我们还观察到一个非常规的快速松弛分量，其时间常数约为10 ps。该快速松弛分量的绝对值在T-C处具有不对称峰值，可能是由于Jahn-Teller失真的短程相关性所致。 （C）2004 Elsevier Ltd.保留所有权利。

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