Flux pinning properties of InN
Author:
Affiliation:

1.Akio Yamamoto3 ,KANG Ting-Ting2,4*;(1.East China Normal University, Shanghai 200062, China;2.State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;3.University of Fukui, Fukui, 910-8507, Japan;4.Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China)

Clc Number:

O472;O469;O511

Fund Project:

Supported by the National Natural Science Foundation of China (11204334, 61475178)

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    Abstract:

    The superconductivity in InN is the foundation for the all III-V semiconductor based superconductor/semiconductor integration. To study the flux pinning properties of InN superconductor, the I-V relationships, R-B transitions, and R-T transitions are investigated. The scaling results of I-V curves indicate there is a vortex glass-liquid transition. The R-T curves are well fitted by thermally activated flux flow (TAFF) model. The TAFF activated energy satisfies a power-law relationship with magnetic field, but it has two different exponents under the low magnetic field and high magnetic field. We explain it as the result of a transition from single flux pinning to collective flux pinning which also leads to the rapid attenuation of critical current as the magnetic field increases. By analyzing the temperature dependence of critical current, we found the dominant δL-pinning mechanism. Furthermore, the dependence of pinning force on magnetic field is analyzed using the Dew-Hughes model, and the results show that the main pinning center is the point pinning. Our work paves the way for studying III-nitrides based hybrid superconductor-semiconductor devices.

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songzhiyong,,,, and. Flux pinning properties of InN[J]. Journal of Infrared and Millimeter Waves,2021,40(3):321~328

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History
  • Received:July 07,2020
  • Revised:May 05,2021
  • Adopted:September 24,2020
  • Online: April 27,2021
  • Published: June 25,2021