Observation of signatures of subresolution defects in two-dimensional superconductors with a scanning SQUID

Hilary Noad, Christopher A. Watson, Hisashi Inoue, Minu Kim, Hiroki K. Sato, Christopher Bell, Harold Y. Hwang, John R. Kirtley, Kathryn A. Moler

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The diamagnetic susceptibility of a superconductor is directly related to its superfluid density. Mutual inductance is a highly sensitive method for characterizing thin films, however, in traditional mutual inductance measurements, the measured response is a nontrivial average over the area of the mutual inductance coils, which are typically of millimeter size. Here we measure localized, isolated features in the diamagnetic susceptibility of Nb superconducting thin films with lithographically defined through holes, δ-doped SrTiO3, and the two-dimensional electron system at the interface between LaAlO3 and SrTiO3, using scanning superconducting quantum interference device susceptometry, with spatial resolution as fine as 0.7μm. We show that these features can be modeled as locally suppressed superfluid density, with a single parameter that characterizes the strength of each feature. This method provides a systematic means of finding and quantifying submicron defects in two-dimensional superconductors.

本文言語English
論文番号064510
ジャーナルPhysical Review B
98
6
DOI
出版ステータスPublished - 2018 8月 21
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「Observation of signatures of subresolution defects in two-dimensional superconductors with a scanning SQUID」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル