| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Sizable Residual Quasiparticle Density of States Induced by Impurity Scattering Effect in Ba(Fe1-xCox)2As2 Single Crystals |
| MU Gang, ZENG Bin, CHENG Peng, WANG Zhao-Sheng, FANG Lei, SHEN Bing, SHAN Lei, REN Cong, WEN Hai-Hu |
| National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190 |
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| Cite this article: |
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MU Gang, ZENG Bin, CHENG Peng et al 2010 Chin. Phys. Lett. 27 037402 |
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Abstract Low-temperature specific heat Cp is measured on Ba(Fe1-xCox)2As2 single 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 Tc, i.e. ΔCp/T\T_c, is also determined. It is found that -γo, ΔCp/T\T_c and Tc 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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| Keywords:
74.20.Rp
74.70.Dd
74.62.Dh
65.40.Ba
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Received: 07 January 2010
Published: 09 March 2010
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| PACS: |
74.20.Rp
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(Pairing symmetries (other than s-wave))
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74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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65.40.Ba
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(Heat capacity)
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