Harmonic generation studies in laser ablated YBCO thin film grown on 〈100〉 MgO |
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| Authors: | Neeraj Khare J R Buckley R M Bowman G B Donaldson C M Pegrum |
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| Institution: | (1) National Physical Laboratory, Superconductivity Group, 110 012 New Delhi, India;(2) Department of Physics and Applied Physics, University of Strathclyde, G4 ONG Glasgow, Scotland |
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| Abstract: | The generation of harmonics in a laser ablated YBCO film deposited on a 〈100〉 MgO substrate is reported. Higher odd harmonics
appeared when the film was subjected to an ac field. The presence of a dc field induces only the second harmonic with a small
value of slope ofV
2−H
dc curve (δV
2/δH
dc) compared to bulk YBCO. The variation of the amplitude of third harmonic (V
3) withH
ac and temperature was studied. These results are explained in terms of a critical state model. The observation of only a small
amplitude of second harmonic (V
2) with a smallδV
2/δH
dc is explained in terms of a special kind of clean grain boundary present in YBCO laser ablated films on 〈100〉 MgO. |
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| Keywords: | Harmonic generation thin film YBCO laser ablation |
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