The overdoped regime in LSCO
A. Avella (1), F. Mancini (1), D. Villani (1, 2) ((1) University, of Salerno, Italy; (2) Rutgers University, USA)
TL;DR
This paper investigates the transition from superconducting to Fermi liquid phases in overdoped LSCO, explaining experimental observations through a van Hove singularity in the Hubbard model's lower band.
Contribution
It introduces a theoretical explanation for the phase transition in LSCO using the Composite Operator Method and the Hubbard model, highlighting the role of a van Hove singularity.
Findings
Thermodynamic response functions show a pronounced feature at the transition.
The Fermi surface undergoes a dramatic change at the transition.
A van Hove singularity explains the observed behaviors.
Abstract
Recent experimental data for the overdoped LSCO have firmly established the properties which characterize the transition between the superconducting and the Fermi liquid metallic phases. The thermodynamic response functions show a pronounced feature at this point, while the Fermi surface undergoes a dramatic change. By use of the Composite Operator Method for the two-dimensional Hubbard model, it is found that the presence of a van Hove singularity in the lower Hubbard band can explain these behaviors.
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