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 |
|---|---|
| Article number | 224511 |
| Journal | Physical Review B |
| Volume | 96 |
| Issue number | 22 |
| DOIs | |
| State | Published - 26 Dec 2017 |
Bibliographical note
Publisher Copyright:© 2017 American Physical Society.
Funding
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. 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.
| Funders | Funder number |
|---|---|
| NSF-funded | |
| National Science Foundation | 1263316 |
| University of Minnesota | |
| Materials Research Science and Engineering Center, Harvard University | DMR-140013 |
| Norsk Sykepleierforbund | |
| National Science Foundation | DMR-12663316 |
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