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We report small-angle neutron scattering measurements of the vortex lattice(VL) structure in single crystals of the lightly underdoped cupratesuperconductor YBa2Cu3O6.85. At 2 K, and for fields of up to 16 T appliedparallel to the crystal c-axis, we observe a sequence of field-driven andfirst-order transitions between different VL structures. By rotating the fieldaway from the c-axis, we observe each structure transition to shift to eitherhigher or lower field dependent on whether the field is rotated towards the[100] or [010] direction. We use this latter observation to argue that theFermi surface morphology must play a key role in the mechanisms that drive theVL structure transitions. Furthermore, we show this interpretation iscompatible with analogous results obtained previously on lightly overdopedYBa2Cu3O7. In that material, it has long-been suggested that the high field VLstructure transition is driven by the nodal gap anisotropy. In contrast, theresults and discussion presented here bring into question the role, if any, ofa nodal gap anisotropy on the VL structure transitions in both YBa2Cu3O6.85 andYBa2Cu3O7.

journal of the physical society of japan

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