电荷有序锰酸盐Y(0.5)Ca(0.5)MnO(3)中的动态异构体位移：穆斯堡尔谱学研究

Dynamic isomer shift in charge-ordering manganite Y(0.5)Ca(0.5)MnO(3): Mössbauer spectroscopy study.

作者信息

Tian H W, Zheng W T, Zheng B, Wang X, Wen Q B, Ding T, Zhao Z D

出版信息

J Phys Chem B. 2005 Feb 10;109(5):1656-9. doi: 10.1021/jp0444823.

Abstract

We report the Mössbauer spectroscopy study on Fe-doped charge-ordering manganite Y(0.5)Ca(0.5)MnO(3). The dynamic isomer shift is observed for charge-ordering manganite, and its origin may be due to strong Jahn-Teller distortions in Y(0.5)Ca(0.5)MnO(3), causing electron-phonon coupling. The evolution of Mössbauer spectroscopy as a function of temperature shows two different phases with significantly different quadrupole splitting values below the charge-ordering transition temperature. This confirms that there exist two different Mn sites (i.e., Mn(3+) and Mn(4+) ions), which can be identified by the microscopic method of Mössbauer spectroscopy.

摘要

我们报道了对铁掺杂电荷有序锰氧化物Y(0.5)Ca(0.5)MnO(3)的穆斯堡尔光谱研究。在电荷有序锰氧化物中观察到动态同质异能位移，其起源可能是由于Y(0.5)Ca(0.5)MnO(3)中强烈的 Jahn-Teller 畸变，导致电子-声子耦合。穆斯堡尔光谱随温度的变化表明，在电荷有序转变温度以下存在两个具有显著不同四极分裂值的不同相。这证实了存在两个不同的锰位点（即Mn(3+)和Mn(4+)离子），它们可以通过穆斯堡尔光谱的微观方法来识别。