Enhanced Superconductivity in TiO Epitaxial Thin Films

Abstract

Titanium oxides have many fascinating optical and electrical properties, such as the superconductivity at 2.0 K in cubic titanium monoxide TiO polycrystalline bulk. However, the lack of TiO single crystals or epitaxial films has prevented systematic investigations on its superconductivity. Here, we report the basic superconductivity characterizations of cubic TiO films epitaxially grown on (0001)-oriented Al2O3 substrates. The magnetic and electronic transport measurements confirmed that TiO is a type-II superconductor and the record high Tc is about 7.4 K. The lower critical field (Hc1) at 1.9 K, the extrapolated upper critical field Hc2(0) and coherence length are about 18 Oe, 13.7 T and 4.9 nm, respectively. With increasing pressure, the value of Tc shifts to lower temperature while the normal state resistivity increases. Our results on the superconducting TiO films confirm the strategy to achieve higher Tc in epitaxial films, which may be helpful for finding more superconducting materials in various related systems.

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• Charge Localization Dynamics induced by Oxygen Vacancies on the Titania TiO${}_2$(110) Surface
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Cited by in corpus (11)

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• Doubling of the superconducting transition temperature in ultra-clean wafer-scale aluminum nanofilms
• Two-Dimensional Superconductivity at the Titanium Sesquioxide Heterointerface
• Growth and characterization of large (Y,La)TiO${}_3$ and (Y,Ca)TiO${}_3$ single crystals
• Superconducting Phase of $\mathrm{T}{\mathrm{i}}_{\mathrm{x}}{\mathrm{O}}_{\mathrm{y}}$ Thin Films Grown by Molecular Beam Epitaxy
• Epitaxial stabilization of an orthorhombic Mg-Ti-O superconductor
• Bipolar conduction and giant positive magnetoresistance in doped metallic titanium oxide heterostructures
• In-situ scattering studies of superconducting vacancy-ordered monoclinic TiO thin films