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Chin. Phys. B, 2016, Vol. 25(6): 067803    DOI: 10.1088/1674-1056/25/6/067803
Special Issue: Virtual Special Topic — High temperature superconductivity

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

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 A1g and B1g 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 B1g 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 B1g mode 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.

Keywords:  iron-based superconductivity      Raman scattering      collapsed phase  
Received:  29 February 2016      Revised:  24 March 2016      Accepted manuscript online: 
PACS:  78.30.-j (Infrared and Raman spectra)  
  63.20.-e (Phonons in crystal lattices)  
  74.70.Xa (Pnictides and chalcogenides)  

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.

Corresponding Authors:  Qingming Zhang     E-mail:

Cite this article: 

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 2016 Chin. Phys. B 25 067803

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