Evidence of local superconductivity in granular Bi nanowires fabricated by electrodeposition

Mingliang Tian; Nitesh Kumar; Moses H. W. Chan; Thomas E. Mallouk

doi:10.1103/PhysRevB.78.045417

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Evidence of local superconductivity in granular Bi nanowires fabricated by electrodeposition

Mingliang Tian, Nitesh Kumar, Moses H. W. Chan, Thomas E. Mallouk

DOI 10.1103/PhysRevB.78.045417 · Physical Review B

T1

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Abstract

An unusual enhancement of resistance (i.e., a “superresistivity”) below a certain characteristic temperature Tsr was observed in granular Bi nanowires. This “superresistive” state was found to be dependent on the applied magnetic field as well as the excitation current. The suppression of Tsr by magnetic field resembles that of a superconductor. The observed superresistivity appears to be related to the nucleation of local superconductivity inside the granular nanowire without long-range phase coherence. The phenomenon is reminiscent of the “Cooper-pair insulator” observed previously in ultrathin two-dimensional superconducting films and three-dimensional percolative superconducting films.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown
Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.3	Pressure not reported	unknown