Spin ordering quantum transitions of superconductors in a magnetic field

Details Spin ordering quantum transitions of superconductors in a magnetic field Spin ordering quantum transitions of superconductors in a magnetic field

2001-03-09

arxiv.org/abs/cond-mat/0103192v4

Physical Review Letters 87, 067202 (2001).

Physics

Condensed Matter

Superconductivity

4 pages, 3 eps figs

Scientific paper

10.1103/PhysRevLett.87.067202

We argue that recent neutron scattering measurements by Lake et. al. (Science 291, 1759 (2001)) of the spin excitation spectrum of LSCO in a magnetic field can be understood in terms of proximity to a phase with co-existing superconductivity and spin density wave order. We present a general theory for such quantum transitions, and argue that their low energy spin fluctuations are controlled by a singular correction from the superflow kinetic energy, acting in the region outside the vortex cores. We propose numerous experimental tests of our theory.

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