Magnetic neutron scattering resonance of high-Tc superconductors in external magnetic fields: An SO(5) study

Niels Asger Mortensen; H. M. Rønnow; Henrik Bruus; Per Hedegård

doi:10.1103/PhysRevB.62.8703

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Magnetic neutron scattering resonance of high-Tc superconductors in external magnetic fields: An SO(5) study

Niels Asger Mortensen, H. M. Rønnow, Henrik Bruus, Per Hedegård

DOI 10.1103/PhysRevB.62.8703 · Physical Review B

T1

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Abstract

The magnetic resonance at 41 meV observed in neutron scattering studies of YBa2Cu3O7 holds a key position in the understanding of high-Tc superconductivity. Within the SO(5) model for superconductivity and antiferromagnetism, we have calculated the effect of an applied magnetic field on the neutron scattering cross section of the magnetic resonance. In the presence of Abrikosov vortices, the neutron scattering cross section shows clear signatures of not only the fluctuations in the superconducting order parameter ψ, but also the modulation of the phase of ψ due to vortices. In reciprocal space we find that (i) the scattering amplitude is zero at (π/a,π/a), (ii) the resonance peak is split into a ring with radius π/d centered at (π/a,π/a), d being the vortex lattice constant, and consequently, (iii) the splitting π/d scales with the magnetic field as B.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown