Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes

Jian Wang; Yi Sun; Mingliang Tian; Bangzhi Liu; Meenakshi Singh; Moses H. W. Chan

doi:10.1103/PhysRevB.86.035439

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Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes

Jian Wang, Yi Sun, Mingliang Tian, Bangzhi Liu, Meenakshi Singh, Moses H. W. Chan

DOI 10.1103/PhysRevB.86.035439 · Physical Review B

T1

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Abstract

The transport properties of superconducting single crystal Pb nanowires that are 55 and 70 nm in diameter were studied by the standard four-electrode method. With normal metal electrodes, resistance-temperature and resistance-magnetic field scans show a series of resistance steps with increasing temperature and magnetic field as the wires are brought toward the normal state. The resistance-current (R-I) scans at different temperatures and magnetic fields show that the increase in R with I is punctuated with sharp steps at specific current values. A large residual resistance is observed down to 2 K. The origin of these phenomena is related to the inhomogeneity and proximity effect from the normal electrodes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	onset
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.98	Pressure not reported	onset
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown