Epitaxial stabilization of (111)-oriented frustrated quantum pyrochlore thin films

Fangdi Wen; Tsung-Chi Wu; Xiaoran Liu; Michael Terilli; Mikhail Kareev; Jak Chakhalian

doi:10.1063/5.0035702

paper

Epitaxial stabilization of (111)-oriented frustrated quantum pyrochlore thin films

arXiv:2010.16379 · doi:10.1063/5.0035702

Abstract

Frustrated rare-earth pyrochlore titanates, Yb $_{2}$ Ti $_{2}$ O $_{7}$ , and Tb $_{2}$ Ti $_{2}$ O $_{7}$ have been proposed as promising candidates to realize quantum spin ice (QSI). Multiple exotic quantum phases, including Coulombic ferromagnet, quantum valence-bond solid, and quadrupolar ordering, have been predicted to emerge in the QSI state upon application of a (111)-oriented external magnetic field. Here, we report on the primal successful layer-by-layer growth of ultra-thin films of frustrated quantum pyrochlores, R $_{2}$ Ti $_{2}$ O $_{7}$ (R = Er, Yb, and Tb), along the (111) direction. We confirm their high crystallinity and proper chemical composition by a combination of methods, including in-situ RHEED, x-ray diffraction, reciprocal space mapping, and x-ray photoelectron spectroscopy. The availability of large area (111)-oriented QSI structures with planar geometry offers a new complementary to the bulk platform to explore strain and magnetic field dependent properties in the quasi-2D limit.

Epitaxial stabilization of (111)-oriented frustrated quantum pyrochlore thin films

Abstract

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