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arXiv 1003.4907cond-mat.supr-con
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BaFe1.9Ni 0.1As 2单晶中的低温specific heat

Low temperature specific heat in BaFe1.9Ni0.1As2 single crystals

Bin Zeng, Gang Mu, Huiqian Luo, Hai-Hu Wen

摘要:

测定了临界转变温度Tc = 20.1K的BaFe_(1.9)Ni_(0.1)As_2单晶的低温比热。明确的比热跃变,数值为\DeltaC /T|观察到Tc \approx为23 mJ/mol K^2。此外,在零温极限下,电子比热系数Δγ(H)与磁场呈近似线性关系,表明样品中至少有一个费米口袋(可能是空穴衍生物口袋)是完全带隙的,且各向异性很小.曲线Δγ(H)的轻微弯曲可能表明在其他费米表面处存在复杂的能隙结构(各向异性能隙或节点)。

英文摘要:

Low-temperature specific heat was measured on the BaFe1.9Ni0.1As2 single crystals with critical transi-tion temperature Tc = 20.1 K. A clear specific heat jump with the value \DeltaC/T|Tc \approx 23 mJ/mol K^2 has been observed. In addition, a roughly linear magnetic field dependence of the electronic specific heat coefficient Δγ(H) is found in the zero-temperature limit, suggesting that at least one Fermi pocket, probably the hole derivative one, is fully gapped with a small anisotropy in the present sample. A slight curvature of the curve Δγ(H) may suggest a complex gap structure (anisotropic gap or nodes) at other Fermi surfaces.

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