Interplay between the magnetic fluctuations and superconductivity in the lanthanum cuprates

TL;DR

This study investigates how magnetic fluctuations interact with superconductivity in lanthanum cuprates, revealing coexistence and spin dynamics across different structural symmetries and doping levels.

Contribution

It provides new insights into the coexistence of magnetic fluctuations and superconductivity in lanthanum cuprates through NMR and ESR analysis.

Findings

Magnetic fluctuations coexist with superconductivity in La_{2-x}Sr_xCuO_4.

Spin stiffness enhances near 1/8 doping regardless of symmetry.

Magnetic correlations are dynamically linked to superconducting regions.

Abstract

We report the analysis of the magnetic fluctuations in the superconducing La_{2-x}Sr_xCuO_4 and the related lanthanum cuprates having the different symmetry of the low temperature structure. The NMR and ESR investigations revealed the dynamical coexistence of the superconductivity and the antiferromagnetic correlations in the large part of superconductivity region of the phase diagram. We show that for all compounds, independent on their low temperature symmetry and on their superconducting properties, the enhancement of the spin stiffness near 1/8 doping takes place.