High-Supercurrent-Density Contacts and Josephson Effect of Strontium Ruthenate
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概要
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We have developed a process of fabricating high-supercurrent-density contacts to Sr2RuO4 as a key technology for the development of topological quantum computing. To minimize degradation, the niobium contacts were formed on crushed surfaces of Sr2RuO4 crystals by an in situ process. A critical supercurrent density as high as 10^{7} A/m2 was achieved, a value two to three orders of magnitude greater than those reported previously. However, the unexpectedly small magnitude of the product of the critical current and the normal resistance indicates the existence of a fundamental limitation arising from Josephson coupling between spin-singlet and spin-triplet superconductivities.
- 2012-11-25
著者
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Maeno Yoshiteru
Department Of Physics Faculty Of Science Hiroshima University
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KASHIWAYA Satoshi
National Institute of Advanced Industrial Science and Technology
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KASHIWAYA Hiromi
National Institute of Advanced Industrial Science and Technology (AIST)
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Tanaka Yukio
Department Of Applied Physics Nagoya University
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Mawatari Yasunori
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Saitoh Kohta
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Koyanagi Masao
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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