Incommensurate Spin Fluctuations in High-Transition Temperature Superconductors

22 August 1997

journal article
research article
Published by American Association for the Advancement of Science (AAAS) in Science

Vol. 277 (5329) , 1067-1071
https://doi.org/10.1126/science.277.5329.1067

Abstract

Neutron scattering experiments have revealed a fascinating interplay between the hole doping, the spin fluctuations, and the superconductivity of the cuprate superconductors. Recently, electrochemical techniques have been used to produce large single crystals of La₂CuO₄₊ _y, which has mobile oxygen dopants. Staging behavior of the excess oxygen has been demonstrated, and the low-energy spin fluctuations in stage 6 La₂CuO₄₊ _y have been measured. The spin fluctuations are incommensurate with the lattice and have spatial, energy, and temperature dependencies very much like those in La₂₋ _xSr_xCuO₄, with similar high transition temperature. This establishes the universality of the incommensurate spin fluctuations among the La₂CuO₄-based superconductors.

Keywords

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