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Spins in the Vortices of a High-Temperature Superconductor

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Science  02 Mar 2001:
Vol. 291, Issue 5509, pp. 1759-1762
DOI: 10.1126/science.1056986

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Abstract

Neutron scattering is used to characterize the magnetism of the vortices for the optimally doped high-temperature superconductor La2-xSrxCuO4 (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.

  • * To whom correspondence should be addressed. E-mail: gabe{at}research.nj.nec.com

  • Present address: H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.

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