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

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arxiv 2407.09075 v2 pith:NXVH3ZJV submitted 2024-07-12 cond-mat.mes-hall cond-mat.supr-con

M.G. Prokudina , A.F. Shevchun , V.S. Khrapai , E.S. Tikhonov This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.supr-con
keywords noiseflakenbsedelta-measurementsthinabsenceacross
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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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  1. $\Delta T$-noise in Multiterminal Hybrid Systems

    cond-mat.mes-hall 2024-11 conditional novelty 5.0 of 10

    In grounded superconducting multiterminal devices, thermal background charge noise can encode heat-conductance information, and thermal shot noise contains Andreev-specific interference terms.

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