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Perspective on solid-phase epitaxy as a method for searching novel topological phases in pyrochlore iridate thin films

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Title
Perspective on solid-phase epitaxy as a method for searching novel topological phases in pyrochlore iridate thin films
Author(s)
Kim, Woo Jin; Jeongkeun Song; Li, Yangyang; Tae Won Noh
Publication Date
2022-08
Journal
APL Materials, v.10, no.8
Publisher
American Institute of Physics Inc.
Abstract
© 2022 Author(s).Pyrochlore iridates exhibit various novel topological phenomena due to their topology and electron correlation. Notably, pyrochlore iridate was the first proposed material system shown to host the time-reversal symmetry broken Weyl semimetal phase. After this profound theoretical proposal, extensive experimental attempts have been made to synthesize high-quality samples in both bulk and film forms. In particular, adjusting thin film geometry represents a practical way to tune the U/t (U: Coulomb interaction and t: for hopping parameter) and identify the various topological phases in the regime U ∼λ (λ: spin-orbit interaction). However, the instability of pyrochlore iridates at high temperature and low oxygen pressure has long been a barrier to growing pyrochlore iridate thin films by conventional film growth methods. To overcome this, pyrochlore iridate films have often been grown by the solid-phase epitaxy method, which uses a metastable amorphous layer grown at low temperature. During a high temperature post-annealing process, the layer in contact with a single crystalline substrate will crystallize epitaxially in the solid state by rearranging atoms at the interface. Here, we present a perspective on the solid-phase epitaxy as a method to synthesize epitaxial pyrochlore iridate thin films and a way to search for novel correlated phenomena.
URI
https://pr.ibs.re.kr/handle/8788114/12771
DOI
10.1063/5.0097608
ISSN
2166-532X
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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