金刚石超导量子干涉装置。

The diamond superconducting quantum interference device.

机构信息

Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France.

出版信息

ACS Nano. 2011 Sep 27;5(9):7144-8. doi: 10.1021/nn2018396. Epub 2011 Aug 4.

DOI:10.1021/nn2018396

Abstract

Diamond is an electrical insulator in its natural form. However, when doped with boron above a critical level (∼0.25 atom %) it can be rendered superconducting at low temperatures with high critical fields. Here we present the realization of a micrometer-scale superconducting quantum interference device (μ-SQUID) made from nanocrystalline boron-doped diamond (BDD) films. Our results demonstrate that μ-SQUIDs made from superconducting diamond can be operated in magnetic fields as large as 4 T independent of the field direction. This is a decisive step toward the detection of quantum motion in a diamond-based nanomechanical oscillator.

摘要

钻石在其自然形态下是电的绝缘体。然而，当掺杂硼的浓度超过临界水平（约 0.25 原子%）时，它可以在低温下表现出超导性，并具有高临界场。在这里，我们展示了一种由纳米晶掺硼金刚石（BDD）薄膜制成的微米级超导量子干涉器件（μ-SQUID）的实现。我们的结果表明，由超导金刚石制成的μ-SQUID 可以在高达 4T 的磁场中独立于磁场方向进行操作。这是朝着在基于金刚石的纳米机械振荡器中检测量子运动迈出的决定性一步。