Spins in the Vortices of a High-Temperature Superconductor

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2 March 2001

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

Vol. 291 (5509) , 1759-1762
https://doi.org/10.1126/science.1056986

Abstract

Neutron scattering is used to characterize the magnetism of the vortices for the optimally doped high-temperature superconductor La_2-xSr_xCuO₄ (x = 0.163) in an applied magnetic field. As temperature is reduced, low-frequency spin fluctuations first disappear with the loss of vortex mobility, but then reappear. We find that the vortex state can be regarded as an inhomogeneous mixture of a superconducting spin fluid and a material containing a nearly ordered antiferromagnet. These experiments show that as for many other properties of cuprate superconductors, the important underlying microscopic forces are magnetic.

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