Enhancement of superconductivity by the small size effect in In nanoparticles

W.-H. Li; C. C. Yang; F. C. Tsao; S. Y. Wu; P. J. Huang; M. K. Chung; Y. D. Yao

doi:10.1103/PhysRevB.72.214516

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Enhancement of superconductivity by the small size effect in In nanoparticles

W.-H. Li, C. C. Yang, F. C. Tsao, S. Y. Wu, P. J. Huang, M. K. Chung, Y. D. Yao

DOI 10.1103/PhysRevB.72.214516 · Physical Review B

T1

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Abstract

The superconducting parameters of zero-dimensional In nanoparticles were studied by measuring the magnetic susceptibility, electrical resistivity, and specific heat. Significant alternations of the superconducting parameters were found for particles with diameters smaller than 120nm. The Anderson regime, where superconductivity was sharply suppressed by the discrete nature of the electronic levels, was seen for particle smaller than 7.5nm. A regime prior to the Anderson one, in which superconductivity was found to vary in accordance with alternations of the structural parameters, due to the small size effect, was also observed and characterized. A nonignorable 5 % increase in TC and a 400 times higher HC were seen for the 39nm particles. The appearance of this regime was closely related to the structural symmetry of the system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.51	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.58	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.36	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.24	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown