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

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

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.

Keywords: superconductivity charge-density-wave structural modulation transmission electron microscopy

Received: 11 March 2014
Revised: 16 May 2014
Accepted manuscript online:

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

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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 2014 Chin. Phys. B 23 086103

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

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