journal article·2024-02-21Open access

Scanning SQUID study of ferromagnetism and superconductivity in infinite-layer nickelates

Ruby A. Shi, Bai Yang Wang, Yusuke Iguchi, Motoki Osada, Kyuho Lee, Berit H. Goodge, Lena F. Kourkoutis, Harold Y. Hwang, Kathryn A. Moler

Physical Review Materials· Volume 8· Issue 2

Abstract

This work studied superconductivity and magnetism in infinite-layer nickelate films with scanning SQUID and cross-sectional STEM. The authors found a landscape of superparamagnetism from NiOx nanoparticles that are extrinsic to the superconductivity. They imaged superconducting vortices and determined the penetration depth. They measured the local diamagnetism, finding a consistent value of the penetration depth. The superfluid density exhibits nearly T-linear dependence, suggesting possible $d$-wave superconductivity. Using scanning SQUID to image the various sources of magnetism in superconducting nickelates paves the way for further studies of vortex dynamics and flux quantization in these recently discovered superconductors.
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Research context

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides · Physics of Superconductivity and Magnetism

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025-7015, USA

Department of Physics, Stanford University, California 94305-4045, USA

Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA

Department of Material Science and Engineering, Stanford University, Stanford, California 94305-4045, USA

School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853-3501, USA

Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853-3501, USA

Department of Applied Physics, Stanford University, California 94305-4045, USA

Funding

U.S. Department of Energy · Office of Science · Basic Energy Sciences · Gordon and Betty Moore Foundation · U.S. Department of Defense · Air Force Office of Scientific Research · David and Lucile Packard Foundation · National Science Foundation · Cornell University · Kavli Institute at Cornell, Cornell University

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