Dataset for "Tuning the structure of the Josephson vortex lattice in Bi2Sr2CaCu2O8+δ single crystals with pancake vortices"

Datasets underpinning the 6 Figures for "Tuning the structure of the Josephson vortex lattice in Bi2Sr2CaCu2O8+δ single crystals with pancake vortices" in Scientific Reports. The primary data files are scanning Hall microscopy (SHM) images of pancake vortices catured at a temperature of 85K. Also included are graphs of vortex chain spacing and the estimated effective anisotropy extracted from the SHM images as a function of applied magnetic field. Simulation results for the vortex chain spacing as a function of applied magnetic field arising from the model described in the Supporting Materials are also included.The primary datasets are scanning Hall microscopy (SHM). These have been captured with a modified low-temperature scanning tunnelling microscope (STM) where the tunnelling tip has been replaced by a custom-fabricated semiconductor chip. The Hall probe is patterned in the two-dimensional electron gas of a GaAs/AlGaAs heterostructure, defined by the intersection of two 800 nm wide wires situated about 5 micrometers from the Au-coated corner of a deep mesa etch that acts as an integrated STM tip. The Hall probe is mounted at an angle of about 1 degree with respect to the sample plane, with the STM tip being the closest point to the sample surface. In operation the sample is first approached towards the sensor until tunnelling is established and then retracted about 100 nm for rapid ‘flying mode’ scanning with the active Hall probe about 200 nm above the sample and a spatial resolution of about 800 nm. In this way quantitative maps of the z-component of magnetic induction can be captured non-invasively. All images shown in this manuscript have been captured at T = 85K, when the full temperature-dependent scan range of our piezotube is 22 µm × 22 µm.The SHM data in the archive are raw as-captured data without any post-processing.SHM image datasets are formatted as the magnetic induction in Gauss measured at each point on a 128 × 128 array of pixel positions (corresponding to the spatial location of the Hall sensor in the plane parallel to the sample). At a measurement temperature of 85K this corresponds to a scan range of 22 µm × 22 µm