Surface superconductivity and twinning-plane superconductivity in aluminum |
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Authors: | I N Khlyustikov |
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Institution: | (1) Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117973, Russia;(2) Institute of Microelectronic Technology and Ultra-High-Purity Materials, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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Abstract: | The critical supercooling field H sc is measured in aluminum single crystals and twinned bicrystals in a temperature range slightly below T c0 (T c0 ? 0.055 K < T < T c0), where T c0 is the critical superconducting transition temperature. It is found that, even in this small temperature range, the H sc(H c) dependence, which is considered to be identical to the H c3(H c) dependence for single crystals, is substantially nonlinear. The H sc(H c) dependences of the twinned bicrystals and single crystals are shown to be significantly different. The qualitative features of the phase diagram of the twinned aluminum bicrystals coincide with those of the phase diagram of twinning-plane superconductivity obtained earlier for tin in 1]. These findings allow the conclusion that the phenomenon of twinning-plane superconductivity also exists in face-centered cubic crystal lattices. |
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