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arXiv · 2407.09075

Local thermometry of NbSe$_2$ flake with delta-$T$ noise measurements

M. G. Prokudina·A. F. Shevchun·V. S. Khrapai·E. S. Tikhonov
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Abstract

We perform transport and noise measurements for device consisting of a thin NbSe$_2$ flake laid onto the predefined gold electrodes and covered with a thin hBN flake. In the shot noise of a NbSe$_2$/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 NbSe$_2$ 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.

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M. G. Prokudina, A. F. Shevchun, V. S. Khrapai, E. S. Tikhonov. 2024-07-12. Local thermometry of NbSe$_2$ flake with delta-$T$ noise measurements. https://doi.org/10.1134/s0021364025607869

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