Tunable polar distortions and magnetism in Gd𝑥⁢La1−𝑥⁢PtSb epitaxial films

Du, Dongxue; Zhang, Chenyu; Wei, Jingrui; Teng, Yujia; Genser, Konrad T.; Voyles, Paul M.; Rabe, Karin M.; Kawasaki, Jason K.

doi:10.1103/PhysRevMaterials.8.104413

Tunable polar distortions and magnetism in Gd_𝑥⁢La_1−𝑥⁢PtSb epitaxial films

Journal Article · Tue Oct 29 00:00:00 EDT 2024 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.8.104413· OSTI ID:2568307

Du, Dongxue ^[1]; ^[1]; Wei, Jingrui ^[1]; ^[2]; Genser, Konrad T. ^[2]; ^[1]; ^[2]; ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Rutgers Univ., New Brunswick, NJ (United States)

Hexagonal 𝐴⁢𝐵⁢𝐶 intermetallics are predicted to have tunable ferroelectric, topological, and magnetic properties as a function of the polar buckling of 𝐵⁢𝐶 atomic planes. Here, we report the impact of isovalent lanthanide substitution on the buckling, structural phase transitions, and electronic and magnetic properties of Gd_𝑥⁢La_1−𝑥⁢PtSb films grown by molecular beam epitaxy (MBE) on 𝑐 plane sapphire substrates. The Gd_𝑥⁢La_1−𝑥⁢PtSb films form a solid solution from 𝑥=0 to 𝑥=1 and retain the polar hexagonal structure (𝑃⁢6₃⁢𝑚⁢𝑐) out to 𝑥 ≤ 0.95. With increasing 𝑥, the PtSb buckling increases and the out-of-plane lattice constant 𝑐 decreases due to the lanthanide contraction. While hexagonal LaPtSb is a highly conductive polar metal, the carrier density decreases with 𝑥 until an abrupt phase transition to a zero band overlap semimetal is found for cubic GdPtSb at 𝑥=1. The magnetic susceptibility peaks at small but finite 𝑥, which we attribute to Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between localized 4⁢𝑓 moments, whose concentration increases with 𝑥, and free carriers that decrease with 𝑥. Samples with 𝑥≥0.3 show antiferromagnetic Curie-Weiss behavior and a Neel temperature that increases with 𝑥. The Gd_𝑥⁢La_1−𝑥⁢PtSb system provides opportunities to dramatically alter the polar buckling and concentration of local 4⁢𝑓 moments.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0023958

OSTI ID:: 2568307

Alternate ID(s):: OSTI ID: 2477076

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 10 Vol. 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Tunable polar distortions and magnetism in Gd𝑥⁢La1−𝑥⁢PtSb epitaxial films

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