Retraction to: Nature

This article has been retracted at the request of the authors Nathan Dasenbrock-Gammon, Elliot Snider, Raymond McBride, Hiranya Pasan, Dylan Durkee, Sachith E. Dissanayake, Keith V. Lawler and Ashkan Salamat. They have expressed the view as researchers who contributed to the work that the published paper does not accurately reflect the provenance of the investigated materials, the experimental measurements undertaken and the data-processing protocols applied. The above-named authors have concluded that these issues undermine the integrity of the published paper.

In addition, and separately, concerns have been independently raised with the journal regarding the reliability of the electrical resistance data presented in the paper. An investigation by the journal and post-publication review have concluded that these concerns are credible, substantial and remain unresolved.

Nugzari Khalvashi-Sutter, Sasanka Munasinghe and Ranga P. Dias have not stated whether they agree or disagree with this retraction.