Phase diagram of a lattice of pancake vortex molecules |
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| Authors: | Y Tanaka A Crisan DD Shivagan A Iyo PM Shirage K Tokiwa T Watanabe N Terada |
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| Institution: | aNational Institute of Advanced Industrial Science and Technology, Tsukuba, Japan;bUniversity of Birmingham, Birmingham, United Kingdom;cNational Institute of Materials Physics, Bucharest, Romania;dTokyo University of Science, Noda, Japan;eKagoshima University, Kagoshima, Japan |
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| Abstract: | On a superconducting bi-layer with thickness much smaller than the penetration depth, λ, a vortex molecule might form. A vortex molecule is composed of two fractional vortices and a soliton wall. The soliton wall can be regarded as a Josephson vortex missing magnetic flux (degenerate Josephson vortex) due to an incomplete shielding. The magnetic energy carried by fractional vortices is less than in the conventional vortex. This energy gain can pay a cost to form a degenerate Josephson vortex. The phase diagram of the vortex molecule is rich because of its rotational freedom. |
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| Keywords: | Superconducting bi-layer Vortex molecule Fractional vortex i-soliton |
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