Raman scattering studies on the collapsed phase of CaCo2As2

In this work,Raman scattering measurements have been performed on the collapsed phase CaCo2As2 crystals.At least 8 Raman modes were observed at room temperature though CaCo2As2 is structurally similar to other 122 compounds like BaFe2As2.Two Raman modes are assigned to the intrinsic A1gand B1gof thi...

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Published in:中国物理B：英文版 2016-06 (6), p.533-536
Main Author: 籍建葶 张安民 杨润 田勇 金峰 邱祥冈 张清明
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Language:English
Subjects:
倒塌
偏振测量
对称性
局部振动
拉曼
散射测量
材料系统
超导电性
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description In this work,Raman scattering measurements have been performed on the collapsed phase CaCo2As2 crystals.At least 8 Raman modes were observed at room temperature though CaCo2As2 is structurally similar to other 122 compounds like BaFe2As2.Two Raman modes are assigned to the intrinsic A1gand B1gof this material system respectively.The other ones are considered to originate from the local vibrations relevant to cobalt vacancies.Careful polarized measurements allow us to clearly resolve the four-fold symmetry of the B1gmode,which put strong constraints on possible point group symmetries of the system with Co vacancies.The temperature-dependent measurements demonstrate that the anomalies in both frequency and width of the B1gmode occur around Neel temperature TN.The anomalies are considered to be related to the gap opening near the magnetic transition.The study may shed light on the structural and magnetic changes and their correlations with superconductivity in 122 systems.
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subjects 倒塌
偏振测量
对称性
局部振动
拉曼
散射测量
材料系统
超导电性
title Raman scattering studies on the collapsed phase of CaCo2As2
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