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Microwave intermodulation distortion of MgB2 thin films.

Lamura, G*; Purnell, A J*; Cohen, L F*; Andreone, A*; Chiarella, F*; Di Gennaro, E*; Vagilo, R*; Hao, L; Gallop, J C (2003) Microwave intermodulation distortion of MgB2 thin films. Appl. Phys. Lett., 82 (25). pp. 4525-4527.

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The two-tone intermodulation arising in MgB2 thin films deposited in situ by planar magnetron sputtering on sapphire substrates is studied. Samples are characterized using an open-ended dielectric puck resonator operating at 8.8 GHz. The experimental results show that the third-order products increase with the two-tone input power with a slope ranging between 1.5 abd 2.3. The behavior can be understood introducing a mechanism of vortex penetration in grain boundaries as a most plausible source of nonlinearities in these films. This assumption is confirmed by the analysis of the field dependence of the surface resistance, that show a linear behavior at all temperatures under test.

Item Type: Article
Subjects: Quantum Phenomena
Last Modified: 02 Feb 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/2694

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