Time evolution of the microwave second-harmonic response of MgB2 superconductor

The 2nd and 3rd order nonlinear microwave response of a superconducting YBa 2 Cu 3 O 7 thin film resonator was synchronously measured using three input tones. This technique permits the local measurement, and hence mapping, of intermodulation distortion (IMD) inside the resonator. 2nd and 3rd order IMD measured with a fixed probe relaxed in remarkably different ways after the removal of a static magnetic field. The 2nd order IMD relaxed by two different magnetic processes, a fast process that appears related to bulk remanent magnetization, and a slow process that fits the description of Bean and Livingston. The 3rd order IMD relaxes by only one process which is distinct from the two processes controlling 2nd order relaxation.

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Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed state

Gallitto

Giunchi

Vigni

et al. 2005

Eur. Phys. J. B

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Abstract. We report on transient effects in the microwave second-order response of different type of superconductors in the mixed state. The samples have contemporarily been exposed to a dc magnetic field, varying with a constant rate of 60 Oe/s, and a pulsed microwave magnetic field. The time evolution of the signal radiated at the second-harmonic frequency of the driving field has been measured for about 500 s from the instant in which the dc-field sweep has been stopped, with sampling time of ∼ 0.3 s. We show that the second-harmonic signal exhibits two relaxation regimes; an initial exponential decay, which endures roughly 10 s, and a logarithmic decay in the time scale of minutes. Evidence is given that the decay in the time scale of minutes is ruled by magnetic relaxation over the surface barrier.PACS. 74.25.Ha Magnetic properties -74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) -74

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Time evolution of the microwave second-harmonic response of MgB2 superconductor

Cited by 3 publications

References 10 publications

Influence of columnar defects on magnetic relaxation of microwave nonlinearity in superconducting YBCO resonator devices

Influence of columnar defects on magnetic relaxation of microwave nonlinearity in superconducting YBCO resonator devices

Relaxation of Microwave Nonlinearity in a Cuprate Superconducting Resonator

Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed state

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