منابع مشابه
Field dependence of harmonic responses and their anisotropy in YBa2Cu3O7+δ thin films
The electrodynamic behaviour of the high-temperature superconductors is strongly affected by the anisotropy of these layered materials. When a pair of coils is positioned on opposite sides of a superconducting thin film, measurements of their mutual inductance can be used to infer the anisotropy of the superconductor. The fundamental and higher harmonic responses of YBa2Cu3O7+δ (YBCO) thin film...
متن کاملNon-thermally activated noise power spectral density in YBa2Cu3O7−δ thin films
The low-frequency noise power spectral density (PSD) of highly c-axis oriented YBa2Cu3O7−δ thin-film microbridges is measured in the temperature range 77–300 K. At room temperature, the value of the Hooge parameter, γ , is 1.8 × 10−3, which is in the range of ordinary metal films. In the normal state, the noise PSD shows the generic ‘1/f noise’ behaviour and decreases as the temperature is decr...
متن کاملPenetration depth measurement in high quality YBa2Cu3O7−x thin films
The parallel plate resonator method has been used for measuring high quality YBa2Cu3O7−x (YBCO) thin films, which have low temperature residual losses comparable to those previously obtained in single crystals. The surface resistance and the real part of the conductivity show a non-monotonic behaviour with a broad peak around 45 K. The penetration depth and the real part of the conductivity var...
متن کاملVortex liquid entanglement in irradiated YBa2Cu3O7 thin films
Z. Sefrioui, D. Arias,* E. M. González, C. León, J. Santamaria, and J. L. Vicent GFMC, Departamento de Fisica Aplicada III, Facultad de Fisica, Universidad Complutense de Madrid, 28040 Madrid, Spain Departamento de Fisica de Materiales, Facultad de Fisica, Universidad Complutense de Madrid, 28040 Madrid, Spain ~Received 12 April 2000; revised manuscript received 11 July 2000; published 18 Janua...
متن کاملDynamics of the dendritic flux instability in YBa2Cu3O7-δ films
– We have studied the dynamics of magnetic-flux avalanches in superconducting YBa2Cu3O7−δ films by means of a fast magneto-optic pump-probe technique. Two regimes of propagation are found: in regime I, directly after the nucleation of the avalanches by a femtosecond laser pulse, the velocity v of the flux dendrites depends strongly on the magnetic field, and values of v up to 180 km/s are obser...
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ژورنال
عنوان ژورنال: Acta Physica Polonica A
سال: 2009
ISSN: 0587-4246,1898-794X
DOI: 10.12693/aphyspola.115.69