Thin Bi single-crystal wires down to ~0.2 Μm in diameter were prepared by pressing liquid Bi into fine Pyrex capillaries. Electron microphotographs were taken to determine the diameter of the wires. Anisotropic magnetoresistance together with Shubnikov-de Haas oscillations were observed at helium temperatures. An anomalous drop in resistivity ϱ(T) was found at T < 50 K. Possible explanations are considered, including one based on the quantum size effect.
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Gurvitch, M. Resistivity anomaly in thin Bi wires: Possibility of a one-dimensional quantum size effect. J Low Temp Phys 38, 777–791 (1980). https://doi.org/10.1007/BF00115503
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DOI: https://doi.org/10.1007/BF00115503