Epitaxial alpha-tantalum grown directly on c-plane sapphire shows a large, power-independent microwave loss that disappears when a niobium interlayer or a damaged sapphire surface prevents direct epitaxial Ta/sapphire contact.
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Interface-sensitive microwave loss in superconducting tantalum films sputtered on c-plane sapphire
Epitaxial alpha-tantalum grown directly on c-plane sapphire shows a large, power-independent microwave loss that disappears when a niobium interlayer or a damaged sapphire surface prevents direct epitaxial Ta/sapphire contact.