Статья

Alkali-Fulleride Superconductors: Synthesis, Composition, and Diamagnetic Shielding

K. HolczerDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569O. KleinDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569Shiou‐Mei HuangDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569Richard B. KanerDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569Ke-Jian FuDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569Robert L. WhettenDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569François DiederichDepartments of Physics and of Chemistry and Biochemistry and Solid State Science Center, University of California, Los Angeles, CA 90024-1569

1991en

ABI

Аннотация

The recent report of a superconductivity onset near the critical temperature T c = 18 K in potassium-doped C 60 raises questions concerning the composition and stability of the superconducting phase. The effects of mixing and heat treatment of K χ C 60 samples prepared over a wide range of initial compositions on the superconducting transition was determined from shielding diamagnetism measurements. A single superconducting phase ( T c = 19.3 K) occurs for which the composition is K 3 C 60 . The shielding reaches a maximum of greater than 40 percent of the perfect diamagnetism, a high value for a powder sample, in samples prepared from 3:1 mixtures. A Rb χ C 60 sample prepared and analyzed in an analogous way exhibited evidence for superconductivity with T c = 30 K and a diamagnetic shielding of 7 percent could be obtained.

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Идентификаторы

DOI: 10.1126/science.252.5009.1154

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Цитирований: 3Использованных источников: 0

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