ISSN:
1572-9605
Keywords:
High-Tc Superconductors
;
Gap Anisotropy
;
Vortex
;
Specific Heat
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The total specific heat of YBa2Cu3O6.95 single crystals includes contributions from phonons and spin-1/2 particles, as well as electronic contributions. The electronic specific heat is described by a quadratic term αT2 in zero field and a linear term [γ(0)+γ⊥(H)]T which is increased when a magnetic field H is applied perpendicular to the CuO2 planes. In agreement with d-wave superconductivity, we find that α≈γn/Tc and γ⊥(H)≈γn(H/Hc2)1/2, where γn is the coefficient of the normal-state linear term. The H1/2 dependence of the density of states at the Fermi level was predicted by G. Volovik for lines of nodes in the gap: the quasiparticles which contribute to this density of states are close to the nodes in momentum space and are located outside the vortex core.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00727428
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