Vortex variable range hopping in a conventional superconducting film

Ilana M. Percher; Irina Volotsenko; Aviad Frydman; Boris I. Shklovskii; Allen M. Goldman

doi:10.1103/PhysRevB.96.224511

Vortex variable range hopping in a conventional superconducting film

Ilana M. Percher, Irina Volotsenko, Aviad Frydman, Boris I. Shklovskii, Allen M. Goldman

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Abstract

The behavior of a disordered amorphous thin film of superconducting indium oxide has been studied as a function of temperature and magnetic field applied perpendicular to its plane. A superconductor-insulator transition has been observed, though the isotherms do not cross at a single point. The curves of resistance versus temperature on the putative superconducting side of this transition, where the resistance decreases with decreasing temperature, obey two-dimensional Mott variable-range hopping of vortices over wide ranges of temperature and resistance. To estimate the parameters of hopping, the film is modeled as a granular system and the hopping of vortices is treated in a manner analogous to hopping of charges. The reason the long-range interaction between vortices over the range of magnetic fields investigated does not lead to a stronger variation of resistance with temperature than that of two-dimensional Mott variable-range hopping remains unresolved.

Original language	English (US)
Article number	224511
Journal	Physical Review B
Volume	96
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.96.224511
State	Published - Dec 26 2017

Bibliographical note

Funding Information:
This work was supported by the Condensed Matter Physics Program of the National Science Foundation under Grant No. DMR-12663316. Part of this work was carried out at the University of Minnesota Characterization Facility, a member of the NSF-funded Materials Research Facilities Network via the MRSEC program (Grant No. DMR-140013), and the Nanofabrication Center, which receives partial support from the NSF through the NNIN program.

Funding Information:
We are grateful to A. Klein and Han Fu for helpful discussions. This work was supported by the Condensed Matter Physics Program of the National Science Foundation under Grant No. DMR-12663316. Part of this work was carried out at the University of Minnesota Characterization Facility, a member of the NSF-funded Materials Research Facilities Network via the MRSEC program (Grant No. DMR-140013), and the Nanofabrication Center, which receives partial support from the NSF through the NNIN program.

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© 2017 American Physical Society.

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title = "Vortex variable range hopping in a conventional superconducting film",

abstract = "The behavior of a disordered amorphous thin film of superconducting indium oxide has been studied as a function of temperature and magnetic field applied perpendicular to its plane. A superconductor-insulator transition has been observed, though the isotherms do not cross at a single point. The curves of resistance versus temperature on the putative superconducting side of this transition, where the resistance decreases with decreasing temperature, obey two-dimensional Mott variable-range hopping of vortices over wide ranges of temperature and resistance. To estimate the parameters of hopping, the film is modeled as a granular system and the hopping of vortices is treated in a manner analogous to hopping of charges. The reason the long-range interaction between vortices over the range of magnetic fields investigated does not lead to a stronger variation of resistance with temperature than that of two-dimensional Mott variable-range hopping remains unresolved.",

author = "Percher, {Ilana M.} and Irina Volotsenko and Aviad Frydman and Shklovskii, {Boris I.} and Goldman, {Allen M.}",

note = "Funding Information: This work was supported by the Condensed Matter Physics Program of the National Science Foundation under Grant No. DMR-12663316. Part of this work was carried out at the University of Minnesota Characterization Facility, a member of the NSF-funded Materials Research Facilities Network via the MRSEC program (Grant No. DMR-140013), and the Nanofabrication Center, which receives partial support from the NSF through the NNIN program. Funding Information: We are grateful to A. Klein and Han Fu for helpful discussions. This work was supported by the Condensed Matter Physics Program of the National Science Foundation under Grant No. DMR-12663316. Part of this work was carried out at the University of Minnesota Characterization Facility, a member of the NSF-funded Materials Research Facilities Network via the MRSEC program (Grant No. DMR-140013), and the Nanofabrication Center, which receives partial support from the NSF through the NNIN program. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

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N2 - The behavior of a disordered amorphous thin film of superconducting indium oxide has been studied as a function of temperature and magnetic field applied perpendicular to its plane. A superconductor-insulator transition has been observed, though the isotherms do not cross at a single point. The curves of resistance versus temperature on the putative superconducting side of this transition, where the resistance decreases with decreasing temperature, obey two-dimensional Mott variable-range hopping of vortices over wide ranges of temperature and resistance. To estimate the parameters of hopping, the film is modeled as a granular system and the hopping of vortices is treated in a manner analogous to hopping of charges. The reason the long-range interaction between vortices over the range of magnetic fields investigated does not lead to a stronger variation of resistance with temperature than that of two-dimensional Mott variable-range hopping remains unresolved.

AB - The behavior of a disordered amorphous thin film of superconducting indium oxide has been studied as a function of temperature and magnetic field applied perpendicular to its plane. A superconductor-insulator transition has been observed, though the isotherms do not cross at a single point. The curves of resistance versus temperature on the putative superconducting side of this transition, where the resistance decreases with decreasing temperature, obey two-dimensional Mott variable-range hopping of vortices over wide ranges of temperature and resistance. To estimate the parameters of hopping, the film is modeled as a granular system and the hopping of vortices is treated in a manner analogous to hopping of charges. The reason the long-range interaction between vortices over the range of magnetic fields investigated does not lead to a stronger variation of resistance with temperature than that of two-dimensional Mott variable-range hopping remains unresolved.

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Vortex variable range hopping in a conventional superconducting film

Abstract

Bibliographical note

MRSEC Support

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MRSEC IRG-1: Electrostatic Control of Materials

University of Minnesota MRSEC (DMR-1420013)

Resistance vs Temperature of an Indium Oxide thin film sample "6.7E-5" at a range of magnetic fields

Cite this

Vortex variable range hopping in a conventional superconducting film

Abstract

Bibliographical note

MRSEC Support

Publisher link

Find It

Other files and links

Fingerprint

Projects

MRSEC IRG-1: Electrostatic Control of Materials

University of Minnesota MRSEC (DMR-1420013)

Datasets

Resistance vs Temperature of an Indium Oxide thin film sample "6.7E-5" at a range of magnetic fields

Cite this