TY - JOUR
T1 - Microwave properties of a Y0.7Ca0.3Ba 2Cu3O7-δ microstrip ring resonator with various hole concentrations
AU - Lai, L. S.
AU - Juang, Jenh-Yih
AU - Wu, Kaung-Hsiung
AU - Uen, T. M.
AU - Lin, Jiunn-Yuan
AU - Gou, Y. S.
PY - 2004/10/15
Y1 - 2004/10/15
N2 - Superconducting ring resonator with a Y0.7Ca 0.3Ba2Cu3O7-δ ground plane was fabricated by using Y0.7Ca0.3Ba2Cu 3O7-δ thin film deposited on both sides of a LaAlO3 (LAO) substrate. The resonator exhibits a high quality factor Q > 104 at T < 30 K, and from empirical relation, T c/Tc,max = 1 - 82.6(p - 0.16)2, we obtained the hole concentration p. By controlling the oxygen contents of the ring resonator, the hole concentration p was controlled from 0.218 to 0.088, determined by the empirical relation, in the same film. The temperature dependence of the resonance frequency, f(T), was then systematically studied. By using Chang's inductive formula and taking a functional form (λ(5K)/λ(T)) 2 = 1 - (T/Tc)2 at T < 0.6Tc, the London penetration depths λ(5K) for various oxygen contents at 5K were obtained, respectively. Finally, it allows us to test the Uemura relation 1/λ2(5K) ∝ Tc from the over- to the underdoped regime in the same sample.
AB - Superconducting ring resonator with a Y0.7Ca 0.3Ba2Cu3O7-δ ground plane was fabricated by using Y0.7Ca0.3Ba2Cu 3O7-δ thin film deposited on both sides of a LaAlO3 (LAO) substrate. The resonator exhibits a high quality factor Q > 104 at T < 30 K, and from empirical relation, T c/Tc,max = 1 - 82.6(p - 0.16)2, we obtained the hole concentration p. By controlling the oxygen contents of the ring resonator, the hole concentration p was controlled from 0.218 to 0.088, determined by the empirical relation, in the same film. The temperature dependence of the resonance frequency, f(T), was then systematically studied. By using Chang's inductive formula and taking a functional form (λ(5K)/λ(T)) 2 = 1 - (T/Tc)2 at T < 0.6Tc, the London penetration depths λ(5K) for various oxygen contents at 5K were obtained, respectively. Finally, it allows us to test the Uemura relation 1/λ2(5K) ∝ Tc from the over- to the underdoped regime in the same sample.
KW - Microwave ring resonators
KW - Penetration depth
KW - YCaBa CuO
UR - http://www.scopus.com/inward/record.url?scp=5144219596&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2004.08.007
DO - 10.1016/j.physc.2004.08.007
M3 - Article
AN - SCOPUS:5144219596
SN - 0921-4534
VL - 415
SP - 133
EP - 138
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 3
ER -