Sizable Residual Quasiparticle Density of States Induced by Impurity Scattering Effect in Ba(Fe1-xCox)2As2 Single Crystals

doi:10.1088/0256-307X/27/3/037402

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摘要 Low-temperature specific heat C_p is measured on Ba(Fe_1-xCo_x)₂As₂single crystals in a wide doping region. A sizeable residual specific heat coefficient γo is observed in the low temperature limit of all samples. The specific heat jump near T_c, i.e. ΔC_p/T\_Tc, is also determined. It is found that -γo, ΔC_p/T\_Tc and T_c all share a similar evolution with doping. These can be well understood within the model of S^± pairing symmetry when accounting for the cobalt-dopants as unitary scattering centers in the FeAs planes. Our results reveal a non-trivial impact of impurity scattering in FeAs-based.

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	MU Gang
	ZENG Bin
	CHENG Peng
	WANG Zhao-Sheng
	FANG Lei
	SHEN Bing
	SHAN Lei
	REN Cong
	WEN Hai-Hu

Abstract：Low-temperature specific heat C_p is measured on Ba(Fe_1-xCo_x)₂As₂single crystals in a wide doping region. A sizeable residual specific heat coefficient γo is observed in the low temperature limit of all samples. The specific heat jump near T_c, i.e. ΔC_p/T\_{T_c}, is also determined. It is found that -γo, ΔC_p/T\_{T_c} and T_c all share a similar evolution with doping. These can be well understood within the model of S^± pairing symmetry when accounting for the cobalt-dopants as unitary scattering centers in the FeAs planes. Our results reveal a non-trivial impact of impurity scattering in FeAs-based.

Key words： 74.20.Rp 74.70.Dd 74.62.Dh 65.40.Ba

收稿日期: 2010-01-07 出版日期: 2010-03-09

:	74.20.Rp	(Pairing symmetries (other than s-wave))
	74.70.Dd	(Ternary, quaternary, and multinary compounds)
	74.62.Dh	(Effects of crystal defects, doping and substitution)
	65.40.Ba	(Heat capacity)

引用本文:

MU Gang;ZENG Bin;CHENG Peng;WANG Zhao-Sheng;FANG Lei;SHEN Bing;SHAN Lei;REN Cong;WEN Hai-Hu. Sizable Residual Quasiparticle Density of States Induced by Impurity Scattering Effect in Ba(Fe_1-xCo_x)₂As₂ Single Crystals[J]. 中国物理快报, 2010, 27(3): 37402-037402.
MU Gang, ZENG Bin, CHENG Peng, WANG Zhao-Sheng, FANG Lei, SHEN Bing, SHAN Lei, REN Cong, WEN Hai-Hu. Sizable Residual Quasiparticle Density of States Induced by Impurity Scattering Effect in Ba(Fe_1-xCo_x)₂As₂ Single Crystals. Chin. Phys. Lett., 2010, 27(3): 37402-037402.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/27/3/037402 或 https://cpl.iphy.ac.cn/CN/Y2010/V27/I3/37402

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