Type-I superconductivity in carbon-coated Sn nano-spheres

L. Shani; V. B. Kumar; A. Gedanken; I. Shapiro; B. Ya Shapiro; A. Shaulov; Y. Yeshurun

doi:10.1016/j.physc.2017.12.003

Type-I superconductivity in carbon-coated Sn nano-spheres

L. Shani
, V. B. Kumar
, A. Gedanken
, I. Shapiro
, B. Ya Shapiro
, A. Shaulov
, Y. Yeshurun

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Tin spheres of diameter ∼120 nm and ∼1400 nm coated with sub-nanometer carbon layers were fabricated, using a sonochemical technique. Samples of both spheres reveal a type-I superconducting behavior characterized by super-critical fields and an intermediate state manifested by a gradual increase of the magnetization to zero. However, the small and large tin spheres exhibit a similar critical field, H_c, contrary to the expected increase in H_c in spheres with size smaller than the coherence length (∼230 nm). Analysis of the data shows that a relative high degree of carbon doping in the small tin spheres, eliminates the expected size-effect on H_c. Simulations, based on the time dependent Ginzburg-Landau equations, imply that the intermediate state in both measured samples consists of only one superconducting domain surrounded by a normal domain, whereas a rich multi-domain structure is predicted for larger Sn spheres.

Original language	English
Pages (from-to)	6-10
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	546
DOIs	https://doi.org/10.1016/j.physc.2017.12.003
State	Published - 15 Mar 2018

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Funding

The experimental work was partially supported by the Israel Science Foundation (ISF) and the German-Israeli Foundation (GIF). The theoretical work and simulations were co-funded by the European Regional Development Fund and the Republic of Cyprus through the Research Promotion Foundation (Project Cy-Tera ΝΕΑ ΥΠΟΔΟΜΗ/ΣΤΡΑΤΗ/0308/31 ).

Funders	Funder number
German-Israeli Foundation for Scientific Research and Development
Research Promotion Foundation	Cy-Tera ΝΕΑ ΥΠΟΔΟΜΗ/ΣΤΡΑΤΗ/0308/31
Israel Science Foundation
European Regional Development Fund

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10.1016/j.physc.2017.12.003

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title = "Type-I superconductivity in carbon-coated Sn nano-spheres",

abstract = "Tin spheres of diameter ∼120 nm and ∼1400 nm coated with sub-nanometer carbon layers were fabricated, using a sonochemical technique. Samples of both spheres reveal a type-I superconducting behavior characterized by super-critical fields and an intermediate state manifested by a gradual increase of the magnetization to zero. However, the small and large tin spheres exhibit a similar critical field, Hc, contrary to the expected increase in Hc in spheres with size smaller than the coherence length (∼230 nm). Analysis of the data shows that a relative high degree of carbon doping in the small tin spheres, eliminates the expected size-effect on Hc. Simulations, based on the time dependent Ginzburg-Landau equations, imply that the intermediate state in both measured samples consists of only one superconducting domain surrounded by a normal domain, whereas a rich multi-domain structure is predicted for larger Sn spheres.",

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T1 - Type-I superconductivity in carbon-coated Sn nano-spheres

AU - Shani, L.

AU - Kumar, V. B.

AU - Gedanken, A.

AU - Shapiro, I.

AU - Shapiro, B. Ya

AU - Shaulov, A.

AU - Yeshurun, Y.

PY - 2018/3/15

Y1 - 2018/3/15

N2 - Tin spheres of diameter ∼120 nm and ∼1400 nm coated with sub-nanometer carbon layers were fabricated, using a sonochemical technique. Samples of both spheres reveal a type-I superconducting behavior characterized by super-critical fields and an intermediate state manifested by a gradual increase of the magnetization to zero. However, the small and large tin spheres exhibit a similar critical field, Hc, contrary to the expected increase in Hc in spheres with size smaller than the coherence length (∼230 nm). Analysis of the data shows that a relative high degree of carbon doping in the small tin spheres, eliminates the expected size-effect on Hc. Simulations, based on the time dependent Ginzburg-Landau equations, imply that the intermediate state in both measured samples consists of only one superconducting domain surrounded by a normal domain, whereas a rich multi-domain structure is predicted for larger Sn spheres.

AB - Tin spheres of diameter ∼120 nm and ∼1400 nm coated with sub-nanometer carbon layers were fabricated, using a sonochemical technique. Samples of both spheres reveal a type-I superconducting behavior characterized by super-critical fields and an intermediate state manifested by a gradual increase of the magnetization to zero. However, the small and large tin spheres exhibit a similar critical field, Hc, contrary to the expected increase in Hc in spheres with size smaller than the coherence length (∼230 nm). Analysis of the data shows that a relative high degree of carbon doping in the small tin spheres, eliminates the expected size-effect on Hc. Simulations, based on the time dependent Ginzburg-Landau equations, imply that the intermediate state in both measured samples consists of only one superconducting domain surrounded by a normal domain, whereas a rich multi-domain structure is predicted for larger Sn spheres.

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Type-I superconductivity in carbon-coated Sn nano-spheres

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