Electronic signatures of successive itinerant, antiferromagnetic transitions in hexagonal La2Ni7

Kyungchan Lee; Na Hyun Jo; Lin-Lin Wang; R A Ribeiro; Yevhen Kushnirenko; Ben Schrunk; Paul C Canfield; Adam Kaminski

doi:10.1088/1361-648X/acc629

Electronic signatures of successive itinerant, antiferromagnetic transitions in hexagonal La₂Ni₇

J Phys Condens Matter. 2023 Apr 3;35(24). doi: 10.1088/1361-648X/acc629.

Authors

Kyungchan Lee^{1

2}, Na Hyun Jo^{1

2}, Lin-Lin Wang^{1

2}, R A Ribeiro^{1

2}, Yevhen Kushnirenko^{1

2}, Ben Schrunk^{1

2}, Paul C Canfield^{1

2}, Adam Kaminski^{1

2}

Affiliations

¹ Department of Physics and Astronomy, Iowa State University, Ames, IA 50014, United States of America.
² Ames Laboratory US Department of Energy, Ames, IA 50011, United States of America.

PMID: 36944256
DOI: 10.1088/1361-648X/acc629

Abstract

We use high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations to study the electronic and magnetic properties of La₂Ni₇, an itinerant magnetic system with a series of three magnetic transition temperatures upon cooling, which end in a weak antiferromagnetic ground state. Our APRES data reveal several electron and hole pockets that have hexagonal symmetry near the Γ point. We observe significant reconstruction of the band structure upon successive magnetic transitions atT₁∼ 61 K,T₂∼ 57 K andT₃∼ 42 K. Several features observed in ARPES data were reasonably well reproduced by DFT calculations, while others were not. In particular, the flat band nearE_Fpredicted by DFT in antiferromagnet (AFM) state, was seemingly absent in ARPES data. Our results detail the effects of magnetic ordering on the electronic structure in a Ni-based weak AFM and highlight challenges of current computational methods.

Keywords: angle resolved photoemission spectroscopy; electronic structure; fragile magnetism.

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