The Jahn–Teller effect and electron–phonon interaction in La0.25Ca0.75Mn1−xCrxO3
The Jahn–Teller effect and electron–phonon interaction in La0.25Ca0.75Mn1−xCrxO3
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DOI：
10.1088/0953-8984/13/28/304
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发表时间：
2001-06
期刊：
影响因子：
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通讯作者：
Haidong Zhou;Guanghai Li;Houtong Chen;R. Zheng;X. Fan;Xiaoguang Li
中科院分区：
文献类型：
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作者：
Haidong Zhou;Guanghai Li;Houtong Chen;R. Zheng;X. Fan;Xiaoguang Li
本文系统地研究了多晶La_（0.25）Ca_（0.75）Mn_（1-x）Cr_xO_3（x = 0，0.03，0.05和0.07）的超声（纵向和横向）速度、输运性质和磁性。结果表明，随着Cr含量的增加，体系的电阻率增大，电荷有序转变温度TCO向低温方向移动，磁矩增强。从超声波速度的温度依赖性，可以建立的Jahn-Teller能量和声子交换常数随Cr含量的增加而降低。
The ultrasonic (longitudinal and transverse) velocities and the transport and magnetic properties of polycrystalline La0.25Ca0.75Mn1-xCrxO3 (x = 0, 0.03, 0.05, and 0.07) have been studied systematically. It was found that with increasing Cr content, the resistivity increases, the charge-ordering transition temperature TCO shifts to low temperature, and the magnetic moment of the system is strengthened. From the temperature dependence of the ultrasonic velocities, one can establish that the Jahn-Teller energy and phonon exchange constant decrease with increasing Cr content.