1. Magnetic field-driven superconductor–insulator transition in boron-doped nanocrystalline chemical vapor deposition diamond.
- Author
-
Gufei Zhang, Vanacken, J., Van De Vondel, J., Decelle, W., Fritzsche, J., Moshchalkov, V. V., Willems, B. L., Janssens, S. D., Haenen, K., and Wagner, P.
- Subjects
SUPERCONDUCTORS ,MAGNETIC fields ,BORON ,NANOCRYSTALS ,CHEMICAL vapor deposition - 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 ρ(T) taken at zero magnetic field. When a magnetic field of B=BSN (N=1,2,...,5) is applied, the plateau moves to low temperature with the thermoresistivity maximum located at TSN (N=1,2,...,5). The ρ(B) curves, measured at different temperatures around TSN , intersect in the ρ-B plane at the field of B=BSN . By tuning BSN from 0 to 5 T, a series of plateaus in the ρ-T plane and the corresponding intersections in the ρ-B plane are observed. The intersections quadratically chain up in the ρ-B plane, separating the superconducting from the insulating region. The thermoresistivity maxima exponentially group up in the ρ-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. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF