Open AccessResponse of a superconductor NbSe2 flake to magnetic field detected with small tunnel junctions
Author(s) -
Naoki Hoshi,
Dai Inoue,
Hiroki Sonoda,
Daisuke Yabe,
Hikari Tomori,
Akinobu Kanda
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1293/1/012016
Subject(s) - condensed matter physics , superconductivity , perpendicular , exfoliation joint , magnetic field , flake , materials science , tunnel junction , voltage , physics , nanotechnology , composite material , quantum tunnelling , geometry , graphene , mathematics , quantum mechanics
We have experimentally studied response of a superconductor NbSe 2 flake to perpendicular magnetic fields using small tunnel junctions. The NbSe 2 film (lateral size ∼ several μ m, thickness ∼ 50 nm) was obtained using the mechanical exfoliation of a bulk crystal and was transfered on top of predefined Au electrodes, forming an Au/NbSe 2 /Au double SIN tunnel junction system. At 4.2 K, between the lower and upper critical fields ( H C 1 and H C 2 ), the voltage of the Au/NbSe 2 /Au structure under constant current of 1 μ A exhibited random-telegraph-noise-like fluctuations as a function of the magnetic field which was applied perpendicular to the NbSe 2 flake. The origin of the voltage fluctuations is discussed.