BCS-universal ratios within the Van Hove scenario

  title={BCS-universal ratios within the Van Hove scenario},
  author={R. Baquero and David Quesada and Carlos Trallero-Giner},
  journal={Physica C-superconductivity and Its Applications},
11 Citations
A Model with a Singular Electronic Density of States and Some Properties of High‐Temperature Superconductors
The influence of singularities in the electronic density of states (DOS) on high-temperature superconductors is studied in the framework of the conventional BCS theory. By using a DOS with
Some universal relations between the gap and thermodynamic functions plausible for various models of superconductors
It is proven that there exist some universal relations between the energy gap and the differences of the thermodynamic potential, entropy, specific heat and critical magnetic field for many two‐ and
Analytical assessment of some characteristic ratios for s-wave superconductors
We evaluate some thermodynamic quantities and characteristic ratios that describe low- and high-temperature s-wave superconducting systems. Based on a set of fundamental equations derived within the
Simple analytical model of the effect of high pressure on the critical temperature and other thermodynamic properties of superconductors
The simple analytical model presented in the paper may turn out to be helpful in searching for novel superconducting components with higher critical temperatures induced by pressure effects.
The Form and Properties of the Tight-Binding Density of States in Two Dimensions. Possible Application to Superconductivity
The form of the density of states for a tight-binding model with the first and the next-nearest neighbour hoppings for a rectangular planar lattice and a shift of the chemical potential are
On Possibility of Realization of d- or p-Wave Symmetry States in Anisotropic Superconductors
We consider a model of high-Tc superconductors with an anisotropic boson-mediated pairing mechanism corresponding to the nearest-neighbor interactions, and the one-particle dispersion relation
Competition mechanism between singlet and triplet superconductivity in the tight-binding model with anisotropic attractive potential
Abstract. Based upon the tight-binding formalism a model of a high-Tc superconductor with isotropic and anisotropic attractive interactions is considered analytically. Symmetry facets of the group
New classes of integrals inherent in the mathematical structure of extended equations describing superconducting systems
In this paper, we discuss the mathematical structure of the s-wave superconducting gap and other quantitative characteristics of superconducting systems. In particular, we evaluate and discuss
Islands of stability of the d-wave order parameter in s-wave anisotropic superconductors
Abstract.In this paper we find and present on diagrams in the coordinates of η=2t1/t0 (the ratio of the second and the first nearest neighbor hopping integrals) and n (the carrier concentration) the


High-temperature superconductivity in the Van Hove scenario.
The influence of a logarithmic Van Hove singularity in the electronic density of states is studied in the framework of the BCS theory. We use a simplified model, neglecting effects such as interlayer
Thermodynamics of superconducting lanthanum
We have calculated the thermodynamics of superconducting lanthanum from numerical solutions of the finite-temperature Eliashberg equations, written on the imaginary frequency axis, with
Anomalous isotope effect and Van Hove singularity in superconducting Cu oxides.
A logarithmic (2D) van Hove singularity in the density of states can provide a basis for understanding these anomalous isotope effects and possibly the origin of high-temperature superconductivity.
Superconductivity in Alcaline-Earth-Substituted La2CuO4: A Theoretical Model
We propose a two-dimensional (2D) band structure calculation for alcaline-earth-substituted La2CuO4 in the tetragonal phase. We find a degenerate logarithmic singularity in the electronic density of
Anisotropy effects on the specific heat jump of a superconductor with normal and paramagnetic impurities
We present analytical calculations of the specific heat jump of an anisotropic superconductor with normal and paramagnetic impurities. We solve the imaginary-axis Eliashberg equations with a