Ultrasonic study on charge ordering, magnetic, and structural changes in La0.25Ca0.75Mn0.93Cr0.07O3
Ultrasonic study on charge ordering, magnetic, and structural changes in La0.25Ca0.75Mn0.93Cr0.07O3
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DOI：
10.1063/1.125974
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发表时间：
2000-02
影响因子：
4
通讯作者：
Xiaoguang Li;Houtong Chen;C. Zhu;Haibiao Zhou;R. Zheng;Jiahui Zhang;Luo Chen
中科院分区：
文献类型：
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作者：
Xiaoguang Li;Houtong Chen;C. Zhu;Haibiao Zhou;R. Zheng;Jiahui Zhang;Luo Chen
系统地研究了La0.25Ca0.75Mn0.93Cr0.07O3多晶的纵向和横向超声速度和衰减、输运和磁性能以及结构变化。纵波和横波的速度极小值和衰减峰都出现在电荷有序转变的温度TCO附近，并伴随着从立方相到四方相的结构变化。在温度Tn附近(c轴长度出现最大值)，两波速度的急剧下降和纵向衰减峰的出现归因于反铁磁相变和四方相c轴长度的反常变化。超声、晶格、电荷有序、磁性和输运反常特征的同时出现，表明系统中存在很强的电子-声子相互作用和自旋-声子相互作用。
The longitudinal and transverse ultrasonic velocities and attenuations, the transport and magnetic properties, as well as the structural changes of polycrystalline La0.25Ca0.75Mn0.93Cr0.07O3 have been studied systematically. A velocity minimum and an attenuation peak for both longitudinal and transverse waves occur around the temperature Tco of charge ordering transition accompanied by the structural change from a cubic to a tetragonal phase. Near temperature TN (where the c-axis length shows a maximum), the sharp decrease of velocities for both waves and the appearance of a longitudinal attenuation peak are attributed to the antiferromagnetic transition together with the anomalous change in c-axis length of the tetragonal phase. The simultaneous occurrence of the ultrasonic, lattice, charge ordering, magnetic, and transport anomalous characteristics indicates the strong electron–phonon and spin–phonon interactions in the system.