Diamond is an electrical insulator in its natural form. However, when doped with boron above a critical level (~0.25 at.%) 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 4T independent on the field direction. This is a decisive step towards the detection of quantum motion in a diamond based nanomechanical oscillator.
@article{arxiv.1110.0102,
title = {The Diamond SQUID},
author = {Soumen Mandal and Tobias Bautze and Oliver A. Williams and Cécile Naud and Étienne Bustarret and Franck Omnès and Pierre Rodière and Tristan Meunier and Christopher Bäuerle and Laurent Saminadayar},
journal= {arXiv preprint arXiv:1110.0102},
year = {2011}
}