Shubnikov-de Haas oscillations and nontrivial topological states in Weyl semimetal candidate SmAlSi.

The RAlX (R = Light rare earth; X = Ge, Si) compounds, as a family of magnetic Weyl semimetal, have recently attracted growing attention due to the tunability of Weyl nodes and its interactions with diverse magnetism by rare-earth atoms. Here, we report the magnetotransport evidence and electronic structure calculations on nontrivial band topology of SmAlSi, a new member of this family. At low temperatures, SmAlSi exhibits large non-saturated magnetoresistance (MR) (as large as ∼5500% at 2 K and 48 T) and distinct Shubnikov-de Haas (SdH) oscillations.

Structure and Magnetic Properties of Melilite-Type Compounds REBeGeO (RE = Pr, Nd, Gd-Yb) with Rare-Earth Ions on Shastry-Sutherland Lattice.

Rare-earth (RE)-based frustrated magnets, such as typical systems of combining strong spin-orbit coupling (SOC), geometric frustration, and anisotropic exchange interaction, can give rise to diverse exotic magnetic ground states such as quantum spin liquid. The discovery of new RE-based frustrated materials is crucial for exploring the exotic magnetic phases. Herein, we report the synthesis, structure, and magnetic properties of a family of melilite-type REBeGeO (RE = Pr, Nd, and Gd-Yb) compounds crystallized in a tetragonal 4̅2 structure, where magnetic RE ions lay out on the Shastry-Sutherland lattice (SSL) within the plane and are well separated by nonmagnetic [GeBeO] polyhedrons along the -axis.

A comparative study on magnetic order and field-induced magnetic transition in double perovskite iridates: REZnIrOand REMgIrO(RE = Pr, Nd, Sm, Eu, Gd).

We perform a comparative magnetic study on two series of rare-earth (RE) based double perovskite iridates REBIrO(RE = Pr, Nd, Sm-Gd; B = Zn, Mg), which show Mott insulating state with tunable charge energy gap from ∼330 meV to ∼560 meV by changing RE cations. For nonmagnetic RE = Eu cations, EuMgIrOshows antiferromagnetic (AFM) order and field-induced spin-flop transitions below Néel temperature () in comparison with the ferromagnetic (FM)-like behaviors of EuZnIrOat low temperatures. For magnetic-moment-containing RE ions, GdBIrOshow contrasting magnetic behaviors with FM-like transition (B = Zn) and AFM order (B = Mg), respectively.

The effect of carrier doping on magnetism and electronic behavior in double perovskite LaZnIrO.

Tuning of spin-orbit coupling and electron correlation effects in iridates by introducing electron or hole carriers can produce interesting physical phenomena. In this work, we experimentally investigate the electron/hole doping effect on magnetism and electrical transport in the canted antiferromagnetic (AFM) double perovskite LaZnIrO, where hole/electron doping are realized in two serial LaZn Li IrO (0  ⩽  x  ⩽  0.35) and LaZnGa IrO (0  ⩽  y   ⩽  0.