For spin-polarized scanning tunneling spectroscopy, commercially available Cr-coated tips (NaugaNeedles LLC: http://nauganeedles.com/products-USSTM-W500-Cr) were used. These tips are characterized by uncompensated magnetic moments at the Cr tip apex, resulting in a spin polarization (up to 45%) at the Fermi level (22). In addition to STS on SmB6 with magnetic tips in zero field, these measurements have also been conducted in magnetic fields. Selected results of one of the field cycles are shown in fig. S1. Here, the magnetic field (applied perpendicular to the sample surface) was gradually increased up to μ0H = 5 T, consecutively ramped back down to zero field, and reversed, with spectra taken at constant field values. No significant change in the tunneling spectra was observed. The dI/dV data perfectly overlapped in the low-field regime; i.e., weak antilocalization effects were not visible in our tunneling spectra. At high magnetic fields, the zero-bias conductance was slightly reduced. Such a high applied field may influence the magnetization orientation within our magnetic tip, which, in turn, can reduce the tunneling current through spin-polarized effects. Notably, scanning the Cr tip over substantial surface areas of pristine SmB6 alludes toward the lack of any significant local dependencies of the spectra.

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