中国物理B ›› 2014, Vol. 23 ›› Issue (8): 86103-086103.doi: 10.1088/1674-1056/23/8/086103
• RAPID COMMUNICATION • 上一篇 下一篇
王莉a, 王臻a, 施洪龙a b, 陈震a, 蒋复国a, 田焕芳a, 杨槐馨a, 房爱芳a, 王楠林a, 李建奇a
Wang Li (王莉)a, Wang Zhen (王臻)a, Shi Hong-Long (施洪龙)a b, Chen Zhen (陈震)a, Chiang Fu-Kuo (蒋复国)a, Tian Huan-Fang (田焕芳)a, Yang Huai-Xin (杨槐馨)a, Fang Ai-Fang (房爱芳)a, Wang Nan-Lin (王楠林)a, Li Jian-Qi (李建奇)a
摘要: 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.
中图分类号: (Electron diffraction and scattering)