Large magnetoresistance of insulating silicon films with superconducting nanoprecipitates | Zendy

V. Heera | Zendy; J. Fiedler | Zendy; W. Skorupa | Zendy

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Large magnetoresistance of insulating silicon films with superconducting nanoprecipitates

Author(s) -

V. Heera,

J. Fiedler,

W. Skorupa

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4964931

Subject(s) - magnetoresistance , condensed matter physics , superconductivity , quasiparticle , materials science , magnetic field , silicon , phenomenological model , electrical resistivity and conductivity , physics , metallurgy , quantum mechanics

We report on large negative and positive magnetoresistance in inhomogeneous, insulating Si:Ga films below a critical temperature of about 7 K. The magnetoresistance effect exceeds 300 % at temperatures below 3 K and fields of 8 T. The comparison of the transport properties of superconducting samples with that of insulating ones reveals that the large magnetoresistance is associated with the appearance of local superconductivity. A simple phenomenological model based on localized Cooper pairs and hopping quasiparticles is able to describe the temperature and magnetic field dependence of the sheet resistance of such films

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