Magnetic structure factor in cuprate superconductors: Evidence for charged meron vortices

Mona Berciu; Sajeev John

doi:10.1103/PhysRevB.69.224515

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Magnetic structure factor in cuprate superconductors: Evidence for charged meron vortices

Mona Berciu, Sajeev John

DOI 10.1103/PhysRevB.69.224515 · Physical Review B

T1

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Abstract

In this paper we demonstrate that a ground state consisting of a quantum liquid of merons and antimerons can quantitatively describe the position and orientation of the incommensurate peaks observed in elastic neutron scattering on cuprates, with essentially no free or adjustable parameters. At small dopings, the relevant length scale is the transverse size of a meron-antimeron pair, defined by the doping concentration. This results in a displacement of the incommensurate peaks from (π,π) which is proportional to doping. At higher dopings, the meron core size becomes relevant, leading to a saturation of the displacement. The formation of stripe-like phases at δ=1∕8 and the suppression of the superconductivity is also recaptured in this model.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y2-xCaxBaNiO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown