Superconductivity of Niobium Thin Films in the BiOCl/Nb Heterostructures
D. Lotnyka, V. Komanický a, V. Bunda b and A. Feher a
aInstitute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
bTranscarpathian Institute of Arts, Voloshiv Str. 37, 88000 Uzhgorod, Ukraine
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In the current paper, electrical transport properties of 25 nm thick Nb films sputtered on the photosensitive semiconductor BiOCl were investigated in the temperature range 7.5 K ≤ T ≤ 8.5 K. The influence of green (532 nm) and red (640 nm) laser excitations on resistive superconducting transitions of the niobium thin films on a silicon glass and BiOCl single crystal substrates were studied. The temperature dependences of the resistivity for Nb are in good agreement with the McMillan model which indicates the strong influence of the inverse proximity effect induced by the interface. The increased influence of the BiOCl/Nb interface under laser excitation corresponds to the raising of the ratio of the density of normal to superconductivity carriers in the Tıghtarrow0 limit and this observation is in agreement with the photoconductivity study of BiOCl single crystals.

DOI: 10.12693/APhysPolA.131.1030
PACS numbers: 74.25.F-,, 74.45.+c