Abstract

Magnetization measurements prove that the magnetic properties of large-angle $(\ensuremath{\theta}>30\ifmmode^\circ\else\textdegree\fi{})$ bismuth bicrystals with a crystallite interface (CI) of twisting types essentially differ from well-known results on single-crystalline specimens. Two superconducting phases with ${T}_{c}\ensuremath{\sim}8.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and $\ensuremath{\sim}4.3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ were observed at the CI of bicrystals while ordinary rhombohedral Bi is not a superconductor. We conclude that these phases have to do with the central part and the adjacent layers of the CI of bicrystals.

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