YBa2Cu3O7-(YBCO) superconducting ring resonators with a YBCO ground plane were fabricated using double-side YBCO films deposited on LaAlO3 (LAO) substrates. The temperature dependent London penetration depth, Δλ = λ(T)-λ(5K), was systematically studied by varying the oxygen content of the same resonator structure. For fully oxygenated condition (δ = 0.05), the resonator exhibits a quality factor Q > 104 at 16K, and Δλ(T) displays a linear behavior over a wide range of temperatures. With increasing δ (e.g. δ = 0.2), although Δλ is still linear in temperature, the slope changes by more than a factor of 2. As δ is further increased, Δλ(T) changes from T- to T2-dependence. The results suggest that in the underdoped regime, the incoherent scattering of charged carriers may become increasingly prominent.
|Number of pages||2|
|Journal||Physica C: Superconductivity and its applications|
|State||Published - 1 Jan 2000|
|Event||International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA|
Duration: 20 Feb 2000 → 25 Feb 2000