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

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

doi:10.1103/physrevmaterials.8.024802

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

Journal Article · Wed Feb 21 00:00:00 EST 2024 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.8.024802· OSTI ID:2310377

^[1]; ^[2]; ^[2]; ^[2]; Lee, Kyuho ^[2]; ^[3]; Kourkoutis, Lena F. ^[3]; Hwang, Harold Y. ^[2]; ^[2]

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford University, CA (United States); Stanford University
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford University, CA (United States)
Cornell University, Ithaca, NY (United States); Cornell University, Ithaca, NY (United States). Kavli Institute at Cornell for Nanoscale Science

Infinite-layer nickelates R_1-xSr_xNiO₂ (R = La, Pr, Nd) are a class of superconductors with structural similarities to cuprates. Although long-range antiferromagnetic order has not been observed for these materials, magnetic effects such as antiferromagnetic spin fluctuations and spin-glass behavior have been reported. Different experiments have drawn different conclusions about whether the pairing symmetry is s or d wave. In this paper, we applied a scanning superconducting quantum interference device (SQUID) to probe the magnetic behavior of film samples of three infinite-layer nickelates (La_0.85Sr_0.15NiO₂, Pr_0.8Sr_0.2NiO₂, and Nd_0.775Sr_0.225NiO₂) grown on SrTiO₃ (STO), each with a nominal thickness of 20 unit cells. In all three films, we observed a ferromagnetic background. We also measured the magnetic susceptibility above the superconducting critical temperature in Pr_0.8Sr_0.2NiO₂ and La_0.85Sr_0.15NiO₂ and identified a non-Curie-Weiss dynamic susceptibility. Both magnetic features are likely due to NiO_x nanoparticles. We investigated superconductivity in Pr_0.8Sr_0.2NiO₂ and Nd_0.775Sr_0.225NiO₂, which exhibited inhomogeneous diamagnetic screening. The superfluid density inferred from the diamagnetic susceptibility in relatively homogeneous regions shows T-linear behavior in both samples. Finally, we observed superconducting vortices in Nd_0.775Sr_0.225NiO₂. We determined a Pearl length of 330 µm for Nd_0.775Sr_0.225NiO₂ at 300 mK, both from the strength of the diamagnetism and from the size and shape of the vortices. These results highlight the importance of considering NiO_x particles when interpreting experimental results for these films.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)

Sponsoring Organization:: Air Force Office of Scientific Research (AFOSR); Gordon and Betty Moore Foundation; National Science Foundation (NSF); Packard Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2310377

Alternate ID(s):: OSTI ID: 2325091

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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

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