Year: 2026
Type: article
Abstract: We report the epitaxial stabilization of GdAuSb films and GdAuSb/LaAuSb superlattices via molecular beam epitaxy on (0001)-oriented ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ substrates. GdAuSb crystallizes in the Au-Au dimerized YPtAs structure type (space group $P{6}_{3}/mmc$), the same structure as the Dirac semimetal LaAuSb. Angle-resolved photoemission spectroscopy (ARPES) measurements show similar near ${E}_{F}$ bandstructures for GdAuSb and LaAuSb, plus a rigid band shift for GdAuSb toward more holelike behavior and corelike Gd $4f$ states $\ensuremath{\sim}9\phantom{\rule{0.16em}{0ex}}\mathrm{eV}$ below the Fermi energy. LaAuSb/GdAuSb superlattices exhibit sharp superlattice fringes by x-ray diffraction and atomically precise interfaces by scanning transmission electron microscopy. Superlattices display two transitions in temperature-dependent resistvity, compared to a single N\'eel temperature for thick GdAuSb films. Superlattices of $Ln\mathrm{AuSb}$ materials ($Ln=$ rare earth) with atomically abrupt interfaces offer an epitaxial platform for control of magnetic and topological order via tunable intralayer exchange and reduced dimensionality.
Source: Physical Review Materials
DOI: 10.1103/18lw-9dl1
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Gordon and Betty Moore Foundation, University of Wisconsin-Madison, College of Agricultural and Life Sciences, Office of Science, Materials Research Science and Engineering Center, Harvard University, Division of Materials Research, Army Research Office, Argonne National Laboratory
Awards: G102163711, G107546177, G1313983767, G1664757510, G187035202, Wisconsin MRSEC, G2287611682, G262962599, G2810298860, G3075337988, G3589692066, G498139845, G513797252, QUANTUM PROBES OF THE MATERIALS ORIGINS OF DECOHERENCE, G6168157521, G6304442258, G6420496198, G6647919573, G6832210154, G6848031779, G6918803902, G7452299184, G8642141694, G961986765, G969889393, G993149817
OpenAlex ID: W7134233227
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