Ginzburg-Landau theory of a resonating-valence-bond superconductor

V. N. Muthukumar; Z. Y. Weng

doi:10.1103/PhysRevB.65.174511

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Ginzburg-Landau theory of a resonating-valence-bond superconductor

V. N. Muthukumar, Z. Y. Weng

DOI 10.1103/PhysRevB.65.174511 · Physical Review B

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Abstract

We present a Ginzburg-Landau formulation of the bosonic resonating-valence-bond (RVB) theory of superconductivity. The superconducting order parameter is characterized by phase vortices that describe spinon excitations and the transition to the superconducting state occurs when such phase vortices (un)bind. We show that the boson RVB theory always leads to hc/2e flux quanta and that the presence of a trapped spin-1/2 moment inside a vortex core gives rise to observable consequences for the low-temperature field-dependent specific heat. We also show that the cores of magnetic fluxoids exhibit enhanced antiferromagnetic correlations with a midgap energy scale and discuss some experimental implications.

Source-reported materials — not catalogue approval

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