Magnetic field-dependence of the basal-plane superconducting anisotropy in YBa2Cu4O8 from small-angle neutron scattering measurements of the vortex lattice

Abstract

We report a study of the basal-plane anisotropy of the superfluid density in underdoped YBa${}_2$Cu${}_4$O${}_8$ (Y124), showing the effects of both the CuO${}_2$ 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 $T_{\mathrm{c}}$ and magnetic induction $B$ from 0.1 to 6 T. We find that the superfluid density along \textbf{a} has a simple $d$-wave T-dependence. However, along \textbf{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${}_2$Cu${}_3$O${}_7$, and also indicate that any magnetic field-induced charge-density-wave order in Y124 exists only for fields above 6 T.

8 pages, accepted in Phys. Rev. B

References in corpus (11)

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Cited by in corpus (5)

• Rotation of the magnetic vortex lattice in Ru7B3 driven by the effects of broken time-reversal and inversion symmetry
• High magnetic field studies of the Vortex Lattice structure in YBa2Cu3O7
• Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor Ru${}_7$B${}_3$
• Influence of the Fermi Surface Morphology on the Magnetic Field-Driven Vortex Lattice Structure Transitions in YBa${}_2$Cu${}_3$O${}_{7-\delta }:\delta =$0, 0.15
• Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor Ru${}_7$B${}_3$ to the London model