  One of the signatures of superconductivity is the formation of the Abrikosov
vortex lattice in type-II superconductors in the presence of an external
magnetic field. Here, we study the near-field radiative heat transfer between a
spherical nanoparticle and a nearby planar substrate, both made of
optimally-doped YBa$_2$Cu$_3$O$_{7-\delta}$. We show that the heat flux
displays a periodic spatial pattern congruent with the material optical
response modulated by the Abrikosov lattice. Our results enrich the toolbox of
methods available to study non-conventional superconductivity.
