Title: Magnetic field-driven superconductor-insulator transition in boron-doped nanocrystalline chemical vapor deposition diamond
Authors: Zhang, Gufei ×
Vanacken, Johan
Van de Vondel, Joris
Decelle, Wim
Fritzsche, J
Moshchalkov, Victor
Willems, B. L
Janssens, S. D
Haenen, K
Wagner, Patrick Hermann #
Issue Date: Jul-2010
Publisher: Amer inst physics
Series Title: Journal of applied physics vol:108 issue:1
Article number: 013904
Abstract: The systematics of the suppression of superconductivity with increasing magnetic field in boron-doped nanocrystalline chemical vapor deposition diamond is studied in a broad temperature range. At the temperature of T-S0 which is above the critical temperature, a plateau is observed in the resistivity versus temperature curve rho(T) taken at zero magnetic field. When a magnetic field of B=B-SN (N=1,2, ... ,5) is applied, the plateau moves to low temperature with the thermoresistivity maximum located at T-SN (N=1,2, ... ,5). The rho(B) curves, measured at different temperatures around T-SN, intersect in the rho-B plane at the field of B=B-SN. By tuning B-SN from 0 to 5 T, a series of plateaus in the rho-T plane and the corresponding intersections in the rho-B plane are observed. The intersections quadratically chain up in the rho-B plane, separating the superconducting from the insulating region. The thermoresistivity maxima exponentially group up in the rho-T plane, thus defining a phase fluctuation zone. The phase boundary, composed of the intersections and separating the superconducting states from the insulating state, is shown to be a generic consequence of granularity. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3437653]
ISSN: 0021-8979
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Soft Matter and Biophysics
× corresponding author
# (joint) last author

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