Physics – Condensed Matter – Superconductivity
Scientific paper
2012-04-10
Phys. Rev. B 85, 134520 (2012)
Physics
Condensed Matter
Superconductivity
Accepted in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.85.134520
We use small angle neutron scattering to study the superconducting vortex lattice in La$_{2-x}$Sr$_x$CuO$_4$ as a function of doping and magnetic field. We show that near optimally doping the vortex lattice coordination and the superconducting coherence length $\xi$ are controlled by a van-Hove singularity crossing the Fermi level near the Brillouin zone boundary. The vortex lattice properties change dramatically as a spin-density-wave instability is approached upon underdoping. The Bragg glass paradigm provides a good description of this regime and suggests that SDW order acts as a novel source of disorder on the vortex lattice.
Bowell C. J.
Brown Scott P.
Chang Jaewan
Dewhurst C. D.
Forgan Edward M.
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