No abstract

No abstract

Magnetization measurements prove that the magnetic properties of large-angle ͑ Ͼ 30°͒ bismuth bicrystals with a crystallite interface ͑CI͒ of twisting types essentially differ from well-known results on single-crystalline specimens. Two superconducting phases with T c ϳ 8.4 K and ϳ4.3 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.

No abstract

No abstract