2000/09/30 by Yuxing Wang, B. Revaz, Bernard Revaz +3 · 4 citations
Chemistry · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Chemistry #Condensed matter physics #Crystal (programming language) #Crystallography #Field (mathematics) #Heat capacity #Magnetic properties of thin films #Mathematics #Paramagnetism #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.63.094508
29 pages(using Revtex style), 14 postscript figures, submitted to Phys. Rev. B Content of the file changed after replacing
arxiv created 2000/10/04 · openalex publication_date 2001/02/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The specific heat due to line nodes in the superconducting gap of YBa2Cu3O7 has been blurred up to now by magnetic terms of extrinsic origin, even for high-quality crystals. We report the specific heat of a single crystal grown in a noncorrosive BaZrO3 crucible, for which paramagnetic terms are reduced to \ensuremath≈0.006% spin-(1)/(2) per Cu atom. The contribution of line nodes shows up directly in the difference C(B,T)\ensuremath-C(0,T) at fixed temperatures (T<5K) as a function of the magnetic field parallel to the c axis (B<~14T). These data illustrate the smooth crossover from C\ensuremath∝T2 at low fields to C\ensuremath∝TB1/2 at high fields, and provide new values for gap parameters that are quantitatively consistent with tunneling spectroscopy and thermal conductivity in the framework of d_x2\ensuremath-y2 pairing symmetry. Data for B along the nodal and antinodal directions in the ab plane are also provided. The in-plane anisotropy predicted in the clean limit is not observed.