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Evidence for enhanced phase fluctuations in nanostructured niobium thin films.
- Source :
-
Physical Review B . 7/8/2017, Vol. 96 Issue 2, p1-1. 1p. - Publication Year :
- 2017
-
Abstract
- In a superconducting nanostructure, phase fluctuations are prominent and give rise to finite resistance below superconducting transition temperature Tc. By using a monolayer polymer/nanosphere hybrid we developed previously, we fabricated a large array of interconnected niobium (Nb) honeycomb lattices with the thinnest interconnected linewidth d ranging from 36 nm to 89 nm. The honeycomb cells form a highly ordered triangular lattice with more than 108 unit cells extending over few mm² area, which enables the detailed transport study at nanometer scales. We found Tc gradually drops with decreasing d due to the phase-slip effect, while the critical field at lower temperature tends to follow that of a continuous Nb thin film. One likely scenario is to consider a model system of numerous superconducting islands interconnected by short phase-slip junctions, where the phase coherence is dictated by the phase slippage in the nanoconstriction. This was strongly supported by the excellent fitting to the thermally activated phase-slip model and also the unusual phenomena of transition width narrowing in high fields. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FLUCTUATIONS (Physics)
*NIOBIUM
*THIN films
Subjects
Details
- Language :
- English
- ISSN :
- 24699950
- Volume :
- 96
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Physical Review B
- Publication Type :
- Academic Journal
- Accession number :
- 124521729
- Full Text :
- https://doi.org/10.1103/PhysRevB.96.020506