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Localization and pair breaking parameter in superconducting molybdenum nitride thin films.

Takuya Tsuneoka1, Kazumasa Makise2, Sho Maeda1

  • 1Department of Physics, Kumamoto University, 2-39-1 Kurokami Chuo-ku, Kumamoto 860-8555, Japan.

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|November 11, 2016
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Summary

We studied the superconductor-insulator transition in molybdenum nitride films. Our findings suggest a critical sheet resistance exists, explained by localization theory but with some deviations in thermal fluctuation analysis.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Thin Film Technology

Background:

  • Superconductor-insulator transitions are crucial for understanding quantum phenomena in materials.
  • Molybdenum nitride films are promising candidates for studying these transitions due to their tunable properties.

Purpose of the Study:

  • To investigate the superconductor-insulator transition in molybdenum nitride films.
  • To analyze the role of localization theory and thermal fluctuations in this transition.

Main Methods:

  • Fabrication of molybdenum nitride films via deposition onto MgO substrates.
  • Measurement of critical temperature (Tc) and normal state sheet resistance (R_sheet).
  • Analysis using Finkel'stein formula, localization theory, and thermal fluctuation correction terms (Aslamazov-Larkin and Maki-Thompson).

Main Results:

  • Superconducting transition temperature (Tc) depression was observed with increasing sheet resistance, consistent with Finkel'stein formula.
  • A critical sheet resistance (R_c) for the transition was identified.
  • Excess conductance due to thermal fluctuations agreed well with theoretical models, despite some deviations in specific dependencies.

Conclusions:

  • Localization theory provides a good framework for understanding the superconductor-insulator transition in these films.
  • Deviations observed in thermal fluctuation analysis warrant further investigation.
  • The study contributes to the understanding of quantum phase transitions in thin film superconductors.