Journal
PHYSICAL REVIEW APPLIED
Volume 6, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.6.064011
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Funding
- Methusalem Funding by the Flemish Government
- FWO projects
- COST Action [MP1201]
- FWO for a postdoctoral grant
- EU [ERDF-ITMS 26220120005]
- Russian Foundation for BasicResearch [15-02-05603]
- [APVV-0036-11]
- [APVV-14-0605]
- [VEGA 1/0409/15]
- [VEGA 2/0149/16]
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Quantum confinement and coherence effects are considered the cause of many specific features for systems which are generally low dimensional, strongly disordered, and/or situated in the vicinity of the metal-insulator transition. Here, we report on the observation of anomalous resistance peak and specific heat peaks superimposed at the superconducting transition of heavily boron-doped polycrystalline bulk diamond, which is a three-dimensional system situated deep on the metallic side of the boron-doping-driven metal-insulator transition in diamond. The anomalous resistance peak and specific heat peaks are interpreted as a result of confinement and coherence effects in the presence of intrinsic and extrinsic granularity. Our data, obtained for superconducting diamond, provide a reference for understanding the superconductivity in other granular disordered systems. Furthermore, our study brings attention to the significant influence of granular disorder on the physical properties of boron-doped diamond, which is considered a promising candidate for electronics applications.
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