Nodal Quasiparticles versus Phase Fluctuations in High Tc Superconductors: An Intermediate Scenario

TL;DR

This paper investigates an intermediate scenario in high-temperature superconductors where nodal quasiparticles and phase fluctuations coexist, analyzing their effects on superfluid density and specific heat within a BCS-Bose Einstein crossover framework.

Contribution

It introduces a BCS-Bose Einstein crossover model for high Tc superconductors that accounts for both fermionic quasiparticles and bosonic pair excitations, aligning with experimental data.

Findings

Nodal quasiparticles and bosonic pairs both influence low-energy excitations.

The model aligns semi-quantitatively with cuprate superconductor data.

No strong evidence for Landau parameter effects in the data.

Abstract

We explore a BCS Bose Einstein crossover scenario for $0 \leq T \leq T_c$ and its implications for the superfluid density and specific heat. The low lying excitations consist of nodal (fermionic) quasi-particles as well as excited (bosonic) pair states. Semi-quantitative comparison with cuprate data is reasonable, with no compelling indications for Landau parameter effects.