Raman scattering studies on the collapsed phase of CaCo2As2

doi:10.1088/1674-1056/25/6/067803

中国物理B ›› 2016, Vol. 25 ›› Issue (6): 67803-067803.doi: 10.1088/1674-1056/25/6/067803

所属专题： Virtual Special Topic — High temperature superconductivity

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Raman scattering studies on the collapsed phase of CaCo₂As₂

Jianting Ji(籍建葶), Anmin Zhang(张安民), Run Yang(杨润), Yong Tian(田勇), Feng Jin(金峰), Xianggang Qiu(邱祥冈), Qingming Zhang(张清明)

1 Department of Physics, Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2016-02-29 修回日期:2016-03-24 出版日期:2016-06-05 发布日期:2016-06-05
通讯作者: Qingming Zhang E-mail:qmzhang@ruc.edu.cn
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2012CB921701), the National Natural Science Foundation of China (Grant No. 11474357), and the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China.

Raman scattering studies on the collapsed phase of CaCo₂As₂

Jianting Ji(籍建葶)¹, Anmin Zhang(张安民)¹, Run Yang(杨润)², Yong Tian(田勇)¹, Feng Jin(金峰)¹, Xianggang Qiu(邱祥冈)², Qingming Zhang(张清明)¹

1 Department of Physics, Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2016-02-29 Revised:2016-03-24 Online:2016-06-05 Published:2016-06-05
Contact: Qingming Zhang E-mail:qmzhang@ruc.edu.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2012CB921701), the National Natural Science Foundation of China (Grant No. 11474357), and the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China.

摘要/Abstract

摘要：

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 A_1g and B_1g of 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 B_1g mode, 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 B_1g mode occur around Neel temperature T_N. 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.

关键词: iron-based superconductivity, Raman scattering, collapsed phase

Abstract:

Key words: iron-based superconductivity, Raman scattering, collapsed phase

中图分类号: (Infrared and Raman spectra)

78.30.-j

63.20.-e (Phonons in crystal lattices) 74.70.Xa (Pnictides and chalcogenides)

籍建葶, 张安民, 杨润, 田勇, 金峰, 邱祥冈, 张清明. Raman scattering studies on the collapsed phase of CaCo₂As₂[J]. 中国物理B, 2016, 25(6): 67803-067803.

Jianting Ji(籍建葶), Anmin Zhang(张安民), Run Yang(杨润), Yong Tian(田勇), Feng Jin(金峰), Xianggang Qiu(邱祥冈), Qingming Zhang(张清明). Raman scattering studies on the collapsed phase of CaCo₂As₂[J]. Chin. Phys. B, 2016, 25(6): 67803-067803.

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Raman scattering studies on the collapsed phase of CaCo₂As₂

Raman scattering studies on the collapsed phase of CaCo₂As₂

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