Specific Heat of YBa$_2$Cu$_3$O$_{7 - {\rm δ}}$ Single Crystals: Implications for the Vortex Structure

Kathryn A. Moler; David J. Baar; Ruixing Liang; Walter N. Hardy; Aharon Kapitulnik

doi:10.1016/0022-3697(95)00163-8

paper

Specific Heat of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ Single Crystals: Implications for the Vortex Structure

arXiv:cond-mat/9505129 · doi:10.1016/0022-3697(95)00163-8

Abstract

The anisotropy of the magnetic field dependence of the specific heat of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ can be used to identify different low-energy excitations, which include phonons, spin- $\frac{1}{2}$ particles, and electronic contributions. With a magnetic field H applied perpendicular to the copper oxide planes, we find that the specific heat includes a linear-T term proportional to $H$ . The nonlinear field dependence of the density of states at the Fermi level suggests that there are quasiparticle excitations throughout the entire vortex, not just in the vortex core. The $H T$ term agrees quantitatively with G. Volovik's prediction for a superconductor with lines of nodes in the gap. A similar, but much smaller, effect is predicted for fields parallel to the planes, and sensitive measurements of the in-plane anisotropic magnetic field dependence of the specific heat could be used to map out the nodes.

14 pages (LaTeX2e) plus 6 uuencoded .eps figures

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d-Wave Model for Microwave Response of High-Tc Superconductors

Specific Heat of YBa2​Cu3​O7−δ​ Single Crystals: Implications for the Vortex Structure

Abstract

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Specific Heat of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ Single Crystals: Implications for the Vortex Structure