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

Low-temperature specific heat was measured on the BaFe 1.9 Ni 0.1 As 2 single crystals with critical transition temperature T c = 20.1 K. A clear specific heat jump with the value Δ C / T | T c ≈ 23 mJ/mol K 2 was observed. In addition, a roughly linear magnetic field dependence of the electronic sp...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2010-07, Vol.53 (7), p.1221-1224
Main Authors: Zeng, Bin, Mu, Gang, Luo, HuiQian, Wen, HaiHu
Format: Article
Language:English
Subjects:
Anisotropy
Astronomy
Classical and Continuum Physics
Crystals
Fermi surfaces
Low temperature
Magnetic fields
Observations and Techniques
Physics
Physics and Astronomy
Research Paper
Single crystals
Specific heat
Transition temperature
Transition temperatures
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Summary:Low-temperature specific heat was measured on the BaFe 1.9 Ni 0.1 As 2 single crystals with critical transition temperature T c = 20.1 K. A clear specific heat jump with the value Δ C / T | T c ≈ 23 mJ/mol K 2 was observed. In addition, a roughly linear magnetic field dependence of the electronic specific heat coefficient Δ γ ( 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 Δ γ ( H ) may suggest a complex gap structure (anisotropic gap or nodes) at other Fermi surfaces.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-010-4032-z