Unusual interplay between copper-spin and vortex dynamics in slightly overdoped La{1.83}Sr{0.17}CuO{4}

TL;DR

This study reveals an unusual interaction between magnetic vortices and spin excitations in slightly overdoped La{1.83}Sr{0.17}CuO{4}, showing that magnetic field influences spin dynamics in a way linked to vortex behavior rather than superconducting transition temperature.

Contribution

It provides new insights into the magnetic and vortex dynamics interplay in slightly overdoped high-temperature superconductors using neutron scattering and susceptibility measurements.

Findings

Magnetic field causes redistribution of spin susceptibility at the spin-gap energy.

Spin gap filling correlates with vortex melting, not Tc2.

Unusual magnetic-vortex and spin excitation interplay observed in overdoped regime.

Abstract

Our inelastic neutron scattering experiments of the spin excitations in the slightly overdoped La{1.83}Sr{0.17}CuO{4} compound show that, under the application of a magnetic field of 5 Tesla, the low-temperature susceptibility undergoes a weight redistribution centered at the spin-gap energy. Furthermore, by comparing the temperature dependence of the neutron data with ac-susceptibility and magnetization measurements, we conclude that the filling in of the spin gap tracks the irreversibility/melting temperature rather than Tc2, which indicates an unusual interplay between the magnetic vortices and the spin excitations even in the slightly overdoped regime of high-temperature superconductors.