Emergent anisotropic three-phase order in critically doped superconducting diamond films

Two decades since its discovery, superconducting heavily boron-doped diamond (HBDD) still poses fundamental questions that need to be answered to unlock its full potential for quantum applications. We use electrical magnetotransport measurements of critically doped homoepitaxial single crystal HBDD films to reveal signatures of intrinsically granular superconductivity. By studying the dependence of electrical resistivity on temperature and magnetic field vector, we infer that this granularity arises from doping induced disorder. We observe an unexpected three-phase anisotropy in the magnetoresistance, accompanied by a spontaneous transverse voltage (Hall anomaly). Our findings indicate the emergence of an anisotropic order in an otherwise isotropic single crystal HBDD film, offering insights into the mechanism of superconductivity in this quantum material.

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Publication Details

Journal
Proceedings of the National Academy of Sciences
Published
2026-05-11
DOI
https://doi.org/10.1073/pnas.2607730123
Primary Topic
Diamond and Carbon-based Materials Research
Type
preprint
Field-Weighted Citation Impact
0.00

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preprint

Emergent anisotropic three-phase order in critically doped superconducting diamond films

Anthony Richardella, Kalana D. Halanayake, D. D. Awschalom, Luke A. M. Lyle et al.
Proceedings of the National Academy of Sciences
Diamond and Carbon-based Materials Research
preprint

Emergent anisotropic three-phase order in critically doped superconducting diamond films

Anthony Richardella, Kalana D. Halanayake, D. D. Awschalom, Luke A. M. Lyle, Gabriel A. Vázquez-Lizardi, Jyotirmay Dwivedi, Saurav Islam, F. Joseph Heremans, David W. Snyder, Nazar Delegan, Jake Morris, Nitin Samarth, Danielle Reifsnyder Hickey
preprint en

Abstract

Two decades since its discovery, superconducting heavily boron-doped diamond (HBDD) still poses fundamental questions that need to be answered to unlock its full potential for quantum applications. We use electrical magnetotransport measurements of critically doped homoepitaxial single crystal HBDD films to reveal signatures of intrinsically granular superconductivity. By studying the dependence of electrical resistivity on temperature and magnetic field vector, we infer that this granularity arises from doping induced disorder. We observe an unexpected three-phase anisotropy in the magnetoresistance, accompanied by a spontaneous transverse voltage (Hall anomaly). Our findings indicate the emergence of an anisotropic order in an otherwise isotropic single crystal HBDD film, offering insights into the mechanism of superconductivity in this quantum material.

Proceedings of the National Academy of SciencesVol. 123(20)
Argonne National Laboratory (US), Pennsylvania State University (US), University of Chicago (US), Advanced Materials and Devices (United States) (US)
National Science Foundation, U.S. Department of Energy, Pennsylvania State University
Openalex Percentile: Top 99%
Diamond and Carbon-based Materials Research
DOIOpen Access PDFOpenAlex
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