Domains in multiband superconductors |
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| Authors: | Y Tanaka T Yanagisawa A Crisan PM Shirage A Iyo K Tokiwa T Nishio A Sundaresan N Terada |
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| Institution: | 1. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken 305-8568, Japan;2. University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom;3. National Institute of Materials Physics, P.O. Box MG-7, Bucharest 077125, Romania;4. Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan;5. Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan;6. Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560 064, India;7. Kagoshima University, Korimoto 1-21-24, Kagoshima-shi, Kagoshima-ken 890-8580, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | Multiband superconductors can have several types of domains that are inhibited in conventional single-band superconductors. These domains are phase domains and chiral domains and their domain wall are an interband phase difference soliton. In a superconductor with an odd number of electronic bands (five or more) and with positive interband Josephson interactions, we find other types of domains with different interband phase differences. We call these domains configuration domains because pseudo-order parameters for each band are dispersed in the complex plain and several configurations, which have several local minima. Fractional vortices serve as hubs for phase difference solitons (configuration domain walls). The divergence of the number of configurations with local minima would pose a serious problem for the stability of superconductivity. |
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