Photochromism-induced amplification of critical current density in superconducting boron-doped diamond with an azobenzene molecular layer

Keisuke Natsui, Takashi Yamamoto, Miku Akahori, Yasuaki Einaga

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A key issue in molecular electronics is the control of electronic states by optical stimuli, which enables fast and high-density data storage and temporal-spatial control over molecular processes. In this article, we report preparation of a photoswitchable superconductor using a heavily boron-doped diamond (BDD) with a photochromic azobenzene (AZ) molecular layer. BDDs electrode properties allow for electrochemical immobilization, followed by copper(I)-catalyzed alkyne-azide cycloaddition (a click reaction). Superconducting properties were examined with magnetic and electrical transport measurements, such as field-dependent isothermal magnetization, temperature-dependent resistance, and the low-temperature voltage-current response. These measurements revealed reversible amplification of the critical current density by 55% upon photoisomerization. This effect is explained as the reversible photoisomerization of AZ inducing an inhomogeneous electron distribution along the BDD surface that renormalizes the surface pinning contribution to the critical current.

Original languageEnglish
Pages (from-to)887-894
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number1
DOIs
Publication statusPublished - 2015 Jan 14

Keywords

  • Azobenzene
  • Boron-doped diamond
  • Click chemistry
  • Critical current density
  • Electrochemistry
  • Photoswitching

ASJC Scopus subject areas

  • Materials Science(all)

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