期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 43, 期 37, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/43/37/374019
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资金
- Research Foundation-Flanders (FWO) [G.0068.07, G.0430.07]
- European Science Foundation (ESF)
The low-temperature electrical transport properties of nanocrystalline boron-doped diamond (b-NCD) thin films have been found to be strongly affected by the system's granularity. The important differences between the high and low-temperature behaviour are caused by the inhomogeneous nucleation of superconductivity in the samples. In this paper we will discuss the experimental data obtained on several b-NCD thin films, which were studied by either varying their thickness or boron concentration. It will be shown that the low-temperature properties are influenced by the b-NCD grain boundaries as well as by the appearance of an intrinsic granularity inside these granules. Moreover, superconducting effects have been found to be present even in insulating b-NCD films and are responsible for the negative magnetoresistance regime observed at low temperatures. On the other hand, the low-temperature electrical transport properties of b-NCD films show important similarities with those observed for granular superconductors.
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