Magnetic field dependence of the basal-plane superconducting anisotropy in YBa sub(2) Cu sub(4) O sub(8) from small-angle neutron scattering measurements of the vortex lattice

We report a study of the basal-plane anisotropy of the superfluid density in underdoped YBa sub(2) Cu sub(4) O sub(8) (Y124), showing the effects of both the CuO sub(2) planes and the fully occupied CuO chains. From small-angle neutron scattering measurements of the vortex lattice, we can infer the...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-01, Vol.89 (2)
Main Authors: White, Jonathan S, Bowell, Charlotte J, Cameron, Alistair S, Heslop, Richard W, Mesot, Joel, Gavilano, Jorge L, Strassle, Simon, Machler, Lars, Khasanov, Rustem, Dewhurst, Charles D, Karpinski, Janusz, gan, Edward M
Format: Article
Language:English
Subjects:
Density
Fluid flow
Fluids
Lattices
Magnetic fields
Neutron scattering
Superconductivity
Superfluidity
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Summary:We report a study of the basal-plane anisotropy of the superfluid density in underdoped YBa sub(2) Cu sub(4) O sub(8) (Y124), showing the effects of both the CuO sub(2) planes and the fully occupied CuO chains. From small-angle neutron scattering measurements of the vortex lattice, we can infer the superconducting (SC) properties for a temperature (T) range T = 1.5 K to T sub(c) and magnetic induction B from 0.1 to 6 T. We find that the superfluid density along a has a simple d-wave T dependence. However, along b (the chain direction) the superfluid density falls much more rapidly with T and also with increasing field. This strongly suggests the suppression of proximity-effect-induced superconductivity in the CuO chains. In addition, our results do not support a common framework for the low-field in-plane SC response in Y124 and related YBa sub(2) Cu sub(3) O sub(7), and also indicate that any magnetic field induced charge-density-wave order in Y124 exists only for fields above 6 T.
ISSN:1098-0121
1550-235X