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arXiv · 1204.2152

Spin density wave induced disordering of the vortex lattice in superconducting La$_{2-x}$Sr$_x$CuO$_4$

J. Chang·J. S. White·M. Laver·C. J. Bowell·S. P. Brown·A. T. Holmes·L. Maechler·S. Strassle·R. Gilardi·S. Gerber·T. Kurosawa·N. Momono·M. Oda·M. Ido·O. J. Lipscombe·S. M. Hayden·C. D. Dewhurst·R. Vavrin·J. Gavilano·J. Kohlbrecher·E. M. Forgan·J. Mesot
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Abstract

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.

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J. Chang, J. S. White, M. Laver, C. J. Bowell, S. P. Brown, A. T. Holmes, L. Maechler, S. Strassle, R. Gilardi, S. Gerber, T. Kurosawa, N. Momono, M. Oda, M. Ido, O. J. Lipscombe, S. M. Hayden, C. D. Dewhurst, R. Vavrin, J. Gavilano, J. Kohlbrecher, E. M. Forgan, J. Mesot. 2012-04-10. Spin density wave induced disordering of the vortex lattice in superconducting La$_{2-x}$Sr$_x$CuO$_4$. https://doi.org/10.1103/physrevb.85.134520

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