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Low temperature specific heat in BaFe_(1.9)Ni_(0.1)As_2 single crystals 被引量:2

Low temperature specific heat in BaFe_(1.9)Ni_(0.1)As_2 single crystals
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摘要 Low-temperature specific heat was measured on the BaFe1.9Ni0.1As2 single crystals with critical transition temperature Tc = 20.1 K.A clear specific heat jump with the value ΔC/T|Tc ≈ 23 mJ/mol K2 was observed.In addition,a roughly linear magnetic field dependence of the electronic specific heat coefficient Δγ(H) was found in the zero-temperature limit,suggesting that at least one Fermi pocket,probably the hole derivative one,was 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. Low-temperature specific heat was measured on the BaFe1.9Ni0.1As2 single crystals with critical transition temperature Tc = 20.1 K.A clear specific heat jump with the value ΔC/T|Tc ≈ 23 mJ/mol K2 was observed.In addition,a roughly linear magnetic field dependence of the electronic specific heat coefficient Δγ(H) was found in the zero-temperature limit,suggesting that at least one Fermi pocket,probably the hole derivative one,was 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.
出处 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2010年第7期1221-1224,共4页 中国科学:物理学、力学、天文学(英文版)
基金 supported by the National Natural Science Foundation of China (Grant Nos. 10221002/A0402 and 10774170/A0402) the National Basic Research Program of China (Grant Nos. 2006CB601000,2006CB921107,and 2006CB921802) the Chinese Academy of Sciences (ITSNEM)
关键词 specific heat BaFe1.9Ni0.1As2 nodeless gap specific heat BaFe1.9Ni0.1As2 nodeless gap
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