TY - JOUR
T1 - Comparative analysis of specific heat of YNi2 B2 C using nodal and two-gap models
AU - Huang, C. L.
AU - Lin, J. Y.
AU - Sun, C. P.
AU - Lee, T. K.
AU - Kim, J. D.
AU - Choi, E. M.
AU - Lee, S. I.
AU - Yang, H. D.
PY - 2006
Y1 - 2006
N2 - The magnetic field dependence of low temperature specific heat in YNi2 B2 C was measured and analyzed using various pairing order parameters. At a zero magnetic field, the two-gap model, which has been successfully applied to MgB2 and the point-node model, appear to describe the superconducting gap function of YNi2 B2 C better than other models based on the isotropic s -wave, the d -wave line nodes, or the s+g wave. The two energy gaps, ΔL =2.67 meV and ΔS =1.19 meV, are obtained. The observed nonlinear field dependence of the electronic specific heat coefficient, γ(H)∼ H0.47, is quantitatively close to the γ(H)∼ H0.5 expected for nodal superconductivity or that can be qualitatively explained using a two-gap scenario. Furthermore, the positive curvature in Hc2 (T) near Tc is qualitatively similar to that in the other two-gap superconductor MgB2.
AB - The magnetic field dependence of low temperature specific heat in YNi2 B2 C was measured and analyzed using various pairing order parameters. At a zero magnetic field, the two-gap model, which has been successfully applied to MgB2 and the point-node model, appear to describe the superconducting gap function of YNi2 B2 C better than other models based on the isotropic s -wave, the d -wave line nodes, or the s+g wave. The two energy gaps, ΔL =2.67 meV and ΔS =1.19 meV, are obtained. The observed nonlinear field dependence of the electronic specific heat coefficient, γ(H)∼ H0.47, is quantitatively close to the γ(H)∼ H0.5 expected for nodal superconductivity or that can be qualitatively explained using a two-gap scenario. Furthermore, the positive curvature in Hc2 (T) near Tc is qualitatively similar to that in the other two-gap superconductor MgB2.
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U2 - 10.1103/PhysRevB.73.012502
DO - 10.1103/PhysRevB.73.012502
M3 - Article
AN - SCOPUS:33244467709
VL - 73
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 1
M1 - 012502
ER -