Jeong Rae Kim, Sandra Glotzer, Evan Krysko, Matthew R. Barone, Jinkwon Kim, Salva Salmani-Rezaie, Adrian Llanos, Joseph Falson
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Superconducting Vacancy-Ordered Rock-Salt NbO Films
We report molecular beam epitaxy synthesis of vacancy-ordered rock-salt NbO thin films that display superconductivity. The unique lattice structure and Nb 2+ oxidation state trigger structural and chemical instabilities in the epitaxial growth process. A comparative study of substrates identifies Al2O3 (0001) as the optimal platform for realizing high-quality, single-phase films when growing at temperatures exceeding 1000 °C. The controlled NbO films exhibit superconductivity with critical temperatures up to Tc = 1.37 K, comparable to bulk single crystals. This work addresses the fundamental bottlenecks encountered in the high-temperature epitaxy of transition-metal suboxide compounds while expanding the scope of available thin-film superconductors.
期刊介绍:
The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.