Local thermometry of NbSe₂ flake with delta-T noise measurements

We perform transport and noise measurements for device consisting of a thin NbSe₂ flake laid onto the predefined gold electrodes and covered with a thin hBN flake. In the shot noise of a NbSe₂/Au tunnel junction (TJ), we identify Andreev reflection regime by demonstrating the effective charge doubling. Further, by creating temperature gradient across the TJ and measuring its delta-T noise in the normal state, we extract electron-phonon scattering length in NbSe₂ and its T-dependence. The results of delta-T noise measurements in the absence of a magnetic field when the flake is superconducting are in qualitative agreement with expectations. The introduced approach is promising for the study of nonequilibrium configurations in superconductors.