Comparative analysis of specific heat of YNi2B2C using nodal and two-gap models

Abstract

The magnetic field dependence of low temperature specific heat in YNi2B2C was measured and analyzed using various pairing order parameters. At 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 YNi2B2C better than other models based on the isotropic s-wave, the d-wave line nodes, or the s+g wave. The two energy gaps, delta_L=2.67 meV and delta_S=1.19 meV are obtained. The observed nonlinear field dependence of electronic specific heat coefficient, gamma(H)~H0.47, is quantitatively close to gamma(H)~H0.5 expected for nodal superconductivity or can be qualitatively explained using two-gap scenario. Furthermore, the positive curvature in Hc2(T) near Tc is qualitatively similar to that in the other two-gap superconductor MgB2.

4 pages, 5 figures, to be published in Physical Review B

References in corpus (23)

• Specific Heat of Mg ^{11}B_2
• Phenomenological two-gap model for the specific heat of MgB_2
• Upper critical field pecularities of superconducting YNi2B2C and LuNi2B2C
• Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB${}_2$
• Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies
• Gap Function with Point Nodes in Borocarbide Superconductor YNi_2B_2C
• Order parameter of MgB_2: a fully gapped superconductor
• Quasiparticle Density of States of Clean and Dirty s-Wave Superconductors in the Vortex State
• Field Dependence of Electronic Specific Heat in Two-Band Superconductors
• Highly Anisotropic Gap Function in Borocarbide Superconductor LuNi_2B_2C
• Ansiotropic s- wave superconductivity in borocarbides LuNi2B2C and YNi2B2C
• Direct Observation of Nodal Quasiparticles in an Unconventional Superconductor: Field-angle Dependent Heat Capacity of YNi2B2C
• Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi_2B_2C
• Phenomenological Theory of Superconductivity and Magnetism in Ho${}_{1-x}$Dy${}_x$Ni${}_2$B${}_2$C
• Evidence of gap anisotropy in superconducting YNi2B2C using directional point contact spectroscopy
• A study of the superconducting gap in RNi${}_2$B${}_2$C (R = Y, Lu) single crystals by inelastic light scattering
• Magnetic field dependence of superconducting energy gaps in YNi2B2C: Evidence of multiband superconductivity
• Evidence for the Coexistence of Anisotropic Superconducting Gap and Nonlocal Effects in the Non-magnetic Superconductor LuNi2B2C
• Strongly Anisotropic s-Wave Gaps in Exotic Superconductors
• Distribution of the superconducting gap in an YNi2B2C film studied by point contact spectroscopy
• BCS theory for s+g-wave superconductivity borocarbides Y(Lu)Ni${}_2$B${}_2$C
• Impurity effects on s+g-wave superconductivity in borocarbides Y(Lu)Ni_2B_2C
• Electron-Phonon Coupling Origin of the resistivity in YNi_{2}B_{2}C Single Crystals

Cited by in corpus (17)

• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Coexistence of isotropic s-wave and extended s-wave order parameters in FeSe as revealed by the low-temperature specific heat
• Crossover from weak to strong pairing in unconventional superconductors
• Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields
• Phase Diagram and Calorimetric Properties of NaFe${}_{1-x}$Co${}_x$As
• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Evidence of multiband superconductivity in the $\beta$-phase Mo${}_{1-x}$Re${}_x$ alloys
• On the interpretation of muon-spin-rotation experiments in the mixed state of type-II superconductors
• Point-contact spectroscopy of the nickel borocarbide superconductor YNi2B2C in the normal and superconducting state
• Superconductivity in a misfit layered compound (SnSe)${}_{1.16}$(NbSe${}_2$)
• Field-induced gapless electron pocket in the superconducting vortex phase of YNi2B2C as probed by magnetoacoustic quantum oscillations
• Multiband superconductivity in the correlated electron filled skutterudite system Pr(1-x)Ce(x)Pt4Ge12
• Thermal conductivity of strong coupling V${}_{1-x}$Ti${}_x$ superconductors in the Mott-Ioffe-Regel limit
• Superconducting properties of the ternary transition-metal silicide Zr2Ru3Si4
• Specific Heat and Upper Critical Field of Sc5Ir4Si10 Superconductor
• Effect of Pt doping on the critical temperature and upper critical field in YNi2-xPtxB2C (x=0-0.2)
• Physical properties and electronic structure of the two-gap superconductor V${}_2$Ga${}_5$