Alkali-fulleride superconductors: Synthesis, composition, and diamagnetic shielding

Károly Holczer; Oliviér Klein; Shiou Mei Huang; Richard B. Kaner; Ke Jian Fu; Robert L. Whetten; François Diederich

doi:10.1126/science.252.5009.1154

Alkali-fulleride superconductors: Synthesis, composition, and diamagnetic shielding

Károly Holczer, Oliviér Klein, Shiou Mei Huang, Richard B. Kaner, Ke Jian Fu, Robert L. Whetten, François Diederich

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Abstract

The recent report of a superconductivity onset near the critical temperature T_c = 18 K in potassium-doped C₆₀ raises questions concerning the composition and stability of the superconducting phase. The effects of mixing and heat treatment of K_x C₆₀ 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 K₃C₆₀. 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_xC₆₀ 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.

Original language	English (US)
Pages (from-to)	1154-1157
Number of pages	4
Journal	Science
Volume	252
Issue number	5009
DOIs	https://doi.org/10.1126/science.252.5009.1154
State	Published - May 24 1991
Externally published	Yes

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title = "Alkali-fulleride superconductors: Synthesis, composition, and diamagnetic shielding",

abstract = "The recent report of a superconductivity onset near the critical temperature Tc = 18 K in potassium-doped C60 raises questions concerning the composition and stability of the superconducting phase. The effects of mixing and heat treatment of Kx C60 samples prepared over a wide range of initial compositions on the superconducting transition was determined from shielding diamagnetism measurements. A single superconducting phase (Tc = 19.3 K) occurs for which the composition is K3C60. 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 RbxC60 sample prepared and analyzed in an analogous way exhibited evidence for superconductivity with Tc = 30 K and a diamagnetic shielding of 7 percent could be obtained.",

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AU - Holczer, Károly

AU - Klein, Oliviér

AU - Huang, Shiou Mei

AU - Kaner, Richard B.

AU - Fu, Ke Jian

AU - Whetten, Robert L.

AU - Diederich, François

PY - 1991/5/24

Y1 - 1991/5/24

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AB - The recent report of a superconductivity onset near the critical temperature Tc = 18 K in potassium-doped C60 raises questions concerning the composition and stability of the superconducting phase. The effects of mixing and heat treatment of Kx C60 samples prepared over a wide range of initial compositions on the superconducting transition was determined from shielding diamagnetism measurements. A single superconducting phase (Tc = 19.3 K) occurs for which the composition is K3C60. 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 RbxC60 sample prepared and analyzed in an analogous way exhibited evidence for superconductivity with Tc = 30 K and a diamagnetic shielding of 7 percent could be obtained.

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Alkali-fulleride superconductors: Synthesis, composition, and diamagnetic shielding

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