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Chin. Phys. B, 2014, Vol. 23(8): 086103    DOI: 10.1088/1674-1056/23/8/086103
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Two-coupled structural modulations in charge-density-wave state of SrPt2As2 superconductor

Wang Lia, Wang Zhena, Shi Hong-Longa b, Chen Zhena, Chiang Fu-Kuoa, Tian Huan-Fanga, Yang Huai-Xina, Fang Ai-Fanga, Wang Nan-Lina, Li Jian-Qia
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b School of Science, Minzu University of China, Beijing 100081, China
Abstract  Transmission electron microscopy (TEM) study of SrPt2As2 reveals two incommensurate modulations appearing in the charge-density-wave (CDW) state below TCDW ≈ 470 K. These two structural modulations can be well explained in terms of condensations of two-coupled phonon modes with wave vectors of q1= 0.62a* on the a*-b* plane and q2= 0.23a* on the a*-c* plane. The atomic displacements occur along the b-axis direction for q1 and along the c-axis direction for q2, respectively. Moreover, the correlation between q1 and q2 can be generally written as q1= (q2+a*)/2 in the CDW state, suggesting the presence of essential coupling between q1 and q2. A small fraction of Ir doping on the Pt site in Sr(Pt1-xIrx)2As2 (x ≤ 0.06) could moderately change these CDW modulations and also affect their superconductivities.
Keywords:  superconductivity      charge-density-wave      structural modulation      transmission electron microscopy     
Received:  11 March 2014      Published:  15 August 2014
PACS:  61.05.J- (Electron diffraction and scattering)  
  74.70.Xa (Pnictides and chalcogenides)  
  71.45.Lr (Charge-density-wave systems)  
  61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling)  
Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00101, 2010CB923002, 2012CB821404, and 2011CB921703), the National Natural Science Foundation of China (Grant Nos. 11190022, 11274368, and 51272277), and the Funds from the Chinese Academy of Sciences.
Corresponding Authors:  Li Jian-Qi     E-mail:  ljq@aphy.iphy.ac.cn

Cite this article: 

Wang Li, Wang Zhen, Shi Hong-Long, Chen Zhen, Chiang Fu-Kuo, Tian Huan-Fang, Yang Huai-Xin, Fang Ai-Fang, Wang Nan-Lin, Li Jian-Qi Two-coupled structural modulations in charge-density-wave state of SrPt2As2 superconductor 2014 Chin. Phys. B 23 086103

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