journal article·2022-12-29Open access

Strongly correlated itinerant magnetism near superconductivity in NiTa4Se8

Nikola Maksimovic, Ryan Day, Alex Liebman-Peláez, Fanghui Wan, Na-Hyun Jo, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Sinead Griffin, John Singleton, James G. Analytis

Physical Review B· Volume 106· Issue 22

Abstract

Metallic ferromagnets with strongly interacting electrons often exhibit remarkable electronic phases such as ferromagnetic superconductivity, complex spin textures, and nontrivial topology. In this report, we discuss the synthesis of a layered magnetic metal $\mathrm{Ni}{\mathrm{Ta}}4{\mathrm{Se}}8$ (or ${\mathrm{Ni}}1/4\mathrm{Ta}{\mathrm{Se}}2$) with a Curie temperature of 58 Kelvin. Magnetization data and density functional theory calculations indicate that the nickel atoms host uniaxial ferromagnetic order of about $0.7{\ensuremath{\mu}}B$ per atom, while an even smaller moment is generated in the itinerant tantalum conduction electrons. Strong correlations are evident in flat bands near the Fermi level, a high heat capacity coefficient, and a high Kadowaki-Woods ratio. Density functional theory calculations suggest that electron and hole Fermi surfaces in the ferromagnetic phase are associated with opposite spin polarization. When the system is diluted of magnetic ions, the samples become superconducting below about 2 Kelvin. We discuss possible mechanisms for superconductivity in this family.
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Research context

OpenAlex topics: Iron-based superconductors research · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics

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

Affiliations

Department of Physics, University of California, Berkeley, California 94720, USA and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Department of Physics, University of California, Berkeley, California 94720, USA; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA; and CIFAR Quantum Materials, CIFAR, Toronto, Ontario M5G 1M1, Canada

Funding

U.S. Department of Energy · Office of Science · National High Magnetic Field Laboratory · National Science Foundation · Florida Department of State · Advanced Light Source

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