Monoclinic LaSb${}_2$ Superconducting Thin Films

Abstract

Rare-earth diantimondes exhibit coupling between structural and electronic orders which are tunable under pressure and temperature. Here we present the discovery of a new polymorph of LaSb${}_2$ stabilized in thin films synthesized using molecular beam epitaxy. Using diffraction, electron microscopy, and first principles calculations we identify a YbSb${}_2$-type monoclinic lattice as a yet-uncharacterized stacking configuration. The material hosts superconductivity with a $T_{\mathrm{c}}$ = 2 K, which is enhanced relative to the bulk ambient phase, and a long superconducting coherence length of 140 nm. This result highlights the potential thin film growth has in stabilizing novel stacking configurations in quasi-two dimensional compounds with competing layered structures.

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Cited by in corpus (2)

• Stacking-Selective Epitaxy of Rare-Earth Diantimonides
• Linear non-saturating magnetoresistance and superconductivity in epitaxial thin films of YbSb${}_2$