Two-coupled structural modulations in charge-density-wave state of SrPt2As2 superconductor

doi:10.1088/1674-1056/23/8/086103

中国物理B ›› 2014, Vol. 23 ›› Issue (8): 86103-086103.doi: 10.1088/1674-1056/23/8/086103

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Two-coupled structural modulations in charge-density-wave state of SrPt₂As₂ superconductor

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

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

收稿日期:2014-03-11 修回日期:2014-05-16 出版日期:2014-08-15 发布日期:2014-08-15
基金资助:
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.

Two-coupled structural modulations in charge-density-wave state of SrPt₂As₂ superconductor

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

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

Received:2014-03-11 Revised:2014-05-16 Online:2014-08-15 Published:2014-08-15
Contact: Li Jian-Qi E-mail:ljq@aphy.iphy.ac.cn
Supported by:
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.

摘要/Abstract

摘要： Transmission electron microscopy (TEM) study of SrPt₂As₂ reveals two incommensurate modulations appearing in the charge-density-wave (CDW) state below T_CDW ≈ 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(Pt_1-xIr_x)₂As₂ (x ≤ 0.06) could moderately change these CDW modulations and also affect their superconductivities.

关键词: superconductivity, charge-density-wave, structural modulation, transmission electron microscopy

Abstract: Transmission electron microscopy (TEM) study of SrPt₂As₂ reveals two incommensurate modulations appearing in the charge-density-wave (CDW) state below T_CDW ≈ 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(Pt_1-xIr_x)₂As₂ (x ≤ 0.06) could moderately change these CDW modulations and also affect their superconductivities.

Key words: superconductivity, charge-density-wave, structural modulation, transmission electron microscopy

中图分类号: (Electron diffraction and scattering)

61.05.J-

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)

王莉, 王臻, 施洪龙, 陈震, 蒋复国, 田焕芳, 杨槐馨, 房爱芳, 王楠林, 李建奇. Two-coupled structural modulations in charge-density-wave state of SrPt₂As₂ superconductor[J]. 中国物理B, 2014, 23(8): 86103-086103.

Wang Li (王莉), Wang Zhen (王臻), Shi Hong-Long (施洪龙), Chen Zhen (陈震), Chiang Fu-Kuo (蒋复国), Tian Huan-Fang (田焕芳), Yang Huai-Xin (杨槐馨), Fang Ai-Fang (房爱芳), Wang Nan-Lin (王楠林), Li Jian-Qi (李建奇). Two-coupled structural modulations in charge-density-wave state of SrPt₂As₂ superconductor[J]. Chin. Phys. B, 2014, 23(8): 86103-086103.

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Two-coupled structural modulations in charge-density-wave state of SrPt₂As₂ superconductor

Two-coupled structural modulations in charge-density-wave state of SrPt₂As₂ superconductor

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