Magnetic field dependence of the density of states of YBa{sub 2}Cu{sub 3}O{sub 6.95}: Implications for the vortex structure

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Superconductivity

DOI:https://doi.org/10.1007/BF00727428· OSTI ID:207183

Moler, K A; Kapitulnik, A ^[1]; Liang, R ^[2]

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1. Stanford Univ., CA (United States)
2. Univ. of British Columbia, Vancouver (Canada); and others

The total specific heat of YBa{sub 2}Cu{sub 3}O{sub 6.95} 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 {alpha}T{sup 2} in zero field and a linear term [{gamma}(0)+{gamma}{perpendicular}(H)]T which is increased when a magnetic field H is applied perpendicular to the CuO{sub 2} planes. In agreement with d-wave superconductivity, the authors find that {alpha}={gamma}{sub n}/T{sub c} and {gamma}{perpendicular}(H) = {gamma}{sub n}{center_dot}(H/H{sub c2}){sup 1/2}, where {gamma}{sub n} is the coefficient of the normal-state linear term. The H{sup 1/2} 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.

• Sponsoring Organization: USDOE
• OSTI ID: 207183
• Journal Information: Journal of Superconductivity, Journal Name: Journal of Superconductivity Journal Issue: 5 Vol. 8; ISSN 0896-1107; ISSN JOUSEH
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
ELECTRONIC SPECIFIC HEAT
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC FLUX
YTTRIUM OXIDES