Electronic-grade epitaxial (111) KTaO3 heterostructures

Jieun Kim, Muqing Yu, Jung Woo Lee, Shun Li Shang, Gi Yeop Kim, Pratap Pal, Jinsol Seo, Neil Campbell, Kitae Eom, Ranjani Ramachandran, Mark S. Rzchowski, Sang Ho Oh, Si Young Choi, Zi Kui Liu, Jeremy Levy, Chang Beom Eom

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

KTaO3 heterostructures have recently attracted attention as model systems to study the interplay of quantum paraelectricity, spin-orbit coupling, and superconductivity. However, the high and low vapor pressures of potassium and tantalum present processing challenges to creating heterostructure interfaces clean enough to reveal the intrinsic quantum properties. Here, we report superconducting heterostructures based on high-quality epitaxial (111) KTaO3 thin films using an adsorption-controlled hybrid PLD to overcome the vapor pressure mismatch. Electrical and structural characterizations reveal that the higher-quality heterostructure interface between amorphous LaAlO3 and KTaO3 thin films supports a two-dimensional electron gas with substantially higher electron mobility, superconducting transition temperature, and critical current density than that in bulk single-crystal KTaO3-based heterostructures. Our hybrid approach may enable epitaxial growth of other alkali metal-based oxides that lie beyond the capabilities of conventional methods.

Original languageEnglish (US)
Article numberadk4288
JournalScience Advances
Volume10
Issue number21
DOIs
StatePublished - May 24 2024

All Science Journal Classification (ASJC) codes

  • General

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