Excitation mode characteristics in Bi2212 rectangular mesa structures

Kashiwagi, T. et al. (2012) Excitation mode characteristics in Bi2212 rectangular mesa structures. Journal of Physics: Conference Series, 400(2), 022050. (doi: 10.1088/1742-6596/400/2/022050)

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The rectangular mesa structure of single crystalline Bi2Sr2CaCu2O8+δ with the dimensions of 64 × 135 × 1.35 μm3 was fabricated by using Ar-ion milling with a metallic mask and focused ion beam. From this mesa, the radiation frequencies of 24.226 cm−1 and 17.296 cm−1 were observed at the different temperatures of 25 K and 40 K, respectively. The change of the radiation frequencies is also obviously reflected in the radiation pattern measurement. The radiation pattern observed at lower temperature seems to have an asymmetric shape and its intensity as a whole is slightly weak. In the higher temperature, however, the radiation intensity increases and the radiation pattern becomes almost symmetric shape. The radiation characteristics observed at higher temperature is well explained by the fundamental cavity resonance mode expected from the width of the mesa. This result may give us not only the suggestion of the existence of the adequate matching condition between the geometrical cavity and the ac Josephson current in the mesa but also the guide for the designing of the high efficiency of the radiation.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Delfanazari, Dr Kaveh
Authors: Kashiwagi, T., Deguchi, K., Tsujimoto, M., Koike, T., Orita, N., Delfanazari, K., Nakayama, R., Kitamura, T., Hagino, S., Sawamura, M., Yamamoto, T., Minami, H., and Kadowaki, K.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Physics: Conference Series
Publisher:IOP Publishing
ISSN (Online):1742-6596

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