Structural and physical properties of undoped and nickel-doped BaFe2-xNixAs2(x=0, 0.04) single crystals

doi:10.1088/1674-1056/19/8/086101

中国物理B ›› 2010, Vol. 19 ›› Issue (8): 86101-086101.doi: 10.1088/1674-1056/19/8/086101

Structural and physical properties of undoped and nickel-doped BaFe_2-xNi_xAs₂(x=0, 0.04) single crystals

李正才, 陆伟, 董晓莉, 周放, 赵忠贤

National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2010-05-13 修回日期:2010-05-17 出版日期:2010-08-15 发布日期:2010-08-15
基金资助:
Project supported by the State Key Development Program for Basic Research of China (Grant No. 2006CB601002) and the National Natural Science Foundation of China (Grant Nos. 10734120 and 10874211).

Structural and physical properties of undoped and nickel-doped BaFe_2-xNi_xAs₂(x=0, 0.04) single crystals

Li Zheng-Cai(李正才), Lu Wei(陆伟), Dong Xiao-Li(董晓莉), Zhou Fang(周放)^†, and Zhao Zhong-Xian(赵忠贤)

National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2010-05-13 Revised:2010-05-17 Online:2010-08-15 Published:2010-08-15
Supported by:
Project supported by the State Key Development Program for Basic Research of China (Grant No. 2006CB601002) and the National Natural Science Foundation of China (Grant Nos. 10734120 and 10874211).

摘要/Abstract

摘要： Single crystals of undoped and nickel-doped BaFe_2-xNi_xAs₂ (x=0, 0.04) have been grown by FeAs self-flux method. The maximum dimension of the crystal is as large as ～ 1 cm along the ab plane. The crystalline topography of a cleaved crystal surface is examined by scanning electron microscope (SEM). By x-ray powder diffraction (XRD) experiments using pure silicon as an internal standard, precise unit cell parameters (tetragonal at room temperature) are determined: a=3.9606(4) ${\AA}$ (1 ${\AA}$ = 0.1 nm), c=13.015(2) ${\AA}$ for BaFe_1.96Ni_0.04As₂ and a =3.9590(5) ${\AA}$, c = 13.024(1) ${\AA}$ for BaFe₂As₂. DC magnetization and transport measurements are performed to check superconducting transition (T_c= 15 K for x = 0.04) and other subtle anomalies. For BaFe_1.96Ni_0.04As₂ crystal, the resistance curve at normal state shows two distinct anomalies associated with spin and structure transitions, and its magnetization data above ～ 91 K exhibit a linear temperature dependence due to spin density wave (SDW) instability.

关键词: BaFe_2-xNi_xAs₂, single crystal, superconductivity, x-ray diffraction

Abstract: Single crystals of undoped and nickel-doped BaFe_2-xNi_xAs₂ (x=0, 0.04) have been grown by FeAs self-flux method. The maximum dimension of the crystal is as large as ～ 1 cm along the ab plane. The crystalline topography of a cleaved crystal surface is examined by scanning electron microscope (SEM). By x-ray powder diffraction (XRD) experiments using pure silicon as an internal standard, precise unit cell parameters (tetragonal at room temperature) are determined: a=3.9606(4) ? (1 ? = 0.1 nm), c=13.015(2) ? for BaFe_1.96Ni_0.04As₂ and a =3.9590(5) ?, c = 13.024(1) ? for BaFe₂As₂. DC magnetization and transport measurements are performed to check superconducting transition (T_c= 15 K for x = 0.04) and other subtle anomalies. For BaFe_1.96Ni_0.04As₂ crystal, the resistance curve at normal state shows two distinct anomalies associated with spin and structure transitions, and its magnetization data above ～ 91 K exhibit a linear temperature dependence due to spin density wave (SDW) instability.

Key words: BaFe_2-xNi_xAs₂, single crystal, superconductivity, x-ray diffraction

中图分类号: (Growth from solutions)

81.10.Dn

74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition) 74.62.Dh (Effects of crystal defects, doping and substitution) 75.30.Fv (Spin-density waves) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)

李正才, 陆伟, 董晓莉, 周放, 赵忠贤. Structural and physical properties of undoped and nickel-doped BaFe_2-xNi_xAs₂(x=0, 0.04) single crystals[J]. 中国物理B, 2010, 19(8): 86101-086101.

Li Zheng-Cai(李正才), Lu Wei(陆伟), Dong Xiao-Li(董晓莉), Zhou Fang(周放), and Zhao Zhong-Xian(赵忠贤). Structural and physical properties of undoped and nickel-doped BaFe_2-xNi_xAs₂(x=0, 0.04) single crystals[J]. Chin. Phys. B, 2010, 19(8): 86101-086101.

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Structural and physical properties of undoped and nickel-doped BaFe_2-xNi_xAs₂(x=0, 0.04) single crystals

Structural and physical properties of undoped and nickel-doped BaFe_2-xNi_xAs₂(x=0, 0.04) single crystals

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