Small Superconducting Grain in the Canonical Ensemble

A. Mastellone; G. Falci; Rosario Fazio

doi:10.1103/PhysRevLett.80.4542

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Small Superconducting Grain in the Canonical Ensemble

A. Mastellone, G. Falci, Rosario Fazio

DOI 10.1103/PhysRevLett.80.4542 · Physical Review Letters

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Abstract

By means of the Lanczos method we analyze superconducting correlations in ultrasmall grains at fixed particle number. We compute the ground-state properties and the excitation gap of the pairing Hamiltonian as a function of the level spacing δ. Both quantities turn out to be parity dependent and universal functions of the ratio δ/Δ ( Δ is the BCS gap). We then characterize superconductivity in the canonical ensemble from the scaling behavior of correlation functions in energy space.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown