Superconductivity in sodium-and lithium-containing alkali-metal fullerides

K. Tanigaki; I. Hirosawa; T. W. Ebbesen; J. Mizuki; Y. Shimakawa; Y. Kubo; J. S. Tsai; S. Kuroshima

doi:10.1038/356419a0

Superconductivity in sodium-and lithium-containing alkali-metal fullerides

K. Tanigaki, I. Hirosawa, T. W. Ebbesen, J. Mizuki, Y. Shimakawa, Y. Kubo, J. S. Tsai, S. Kuroshima

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Abstract

THE discovery¹ of superconductivity, with a transition temperature T_c of 18 K, in potassium-doped C₆₀ was followed by the synthesis of other superconducting M₃C₆₀ phases: Rb₃C₆₀ (T_c = 28K and 30 K; refs 2, 3), CsRb₂C₆₀ (T_c = 31K; ref. 4) and Cs₂RbC₆₀ (Tc = 33 K; ref. 4). A monotonic relationship is observed⁵ between Tc and lattice constant a₀ for these face-centred cubic M₃C₀ compounds, all of which have a₀ values larger than that of pure C₆₀. Here we study this relationship over a wider range using mixed alkali compounds incorporating sodium (Na₂MC₆₀, where M is K, Rb or Cs) and lithium (Li₂CsC₆₀). The Na₂MC₆₀ compounds have face-centred cubic structures and are superconducting, with T_c = 12 K (M = Cs), 2.5 K (M = Rb) and 2.5 K (M = K); these Tc_s are lower than those predicted on the basis of high-pressure studies^6-8. This departure from the previous relationship between T_c and a₀ for lattice parameters smaller than that of pristine C₆₀ may provide new insights into what controls superconductivity in these materials.

Original language	English
Pages (from-to)	419-421
Number of pages	3
Journal	Nature
Volume	356
Issue number	6368
DOIs	https://doi.org/10.1038/356419a0
Publication status	Published - 1992
Externally published	Yes

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title = "Superconductivity in sodium-and lithium-containing alkali-metal fullerides",

abstract = "THE discovery1 of superconductivity, with a transition temperature Tc of 18 K, in potassium-doped C60 was followed by the synthesis of other superconducting M3C60 phases: Rb3C60 (Tc = 28K and 30 K; refs 2, 3), CsRb2C60 (Tc = 31K; ref. 4) and Cs2RbC60 (Tc = 33 K; ref. 4). A monotonic relationship is observed5 between Tc and lattice constant a0 for these face-centred cubic M3C0 compounds, all of which have a0 values larger than that of pure C60. Here we study this relationship over a wider range using mixed alkali compounds incorporating sodium (Na2MC60, where M is K, Rb or Cs) and lithium (Li2CsC60). The Na2MC60 compounds have face-centred cubic structures and are superconducting, with Tc = 12 K (M = Cs), 2.5 K (M = Rb) and 2.5 K (M = K); these Tcs are lower than those predicted on the basis of high-pressure studies6-8. This departure from the previous relationship between Tc and a0 for lattice parameters smaller than that of pristine C60 may provide new insights into what controls superconductivity in these materials.",

author = "K. Tanigaki and I. Hirosawa and Ebbesen, {T. W.} and J. Mizuki and Y. Shimakawa and Y. Kubo and Tsai, {J. S.} and S. Kuroshima",

year = "1992",

doi = "10.1038/356419a0",

language = "English",

volume = "356",

pages = "419--421",

journal = "Nature",

issn = "0028-0836",

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T1 - Superconductivity in sodium-and lithium-containing alkali-metal fullerides

AU - Tanigaki, K.

AU - Hirosawa, I.

AU - Ebbesen, T. W.

AU - Mizuki, J.

AU - Shimakawa, Y.

AU - Kubo, Y.

AU - Tsai, J. S.

AU - Kuroshima, S.

PY - 1992

Y1 - 1992

N2 - THE discovery1 of superconductivity, with a transition temperature Tc of 18 K, in potassium-doped C60 was followed by the synthesis of other superconducting M3C60 phases: Rb3C60 (Tc = 28K and 30 K; refs 2, 3), CsRb2C60 (Tc = 31K; ref. 4) and Cs2RbC60 (Tc = 33 K; ref. 4). A monotonic relationship is observed5 between Tc and lattice constant a0 for these face-centred cubic M3C0 compounds, all of which have a0 values larger than that of pure C60. Here we study this relationship over a wider range using mixed alkali compounds incorporating sodium (Na2MC60, where M is K, Rb or Cs) and lithium (Li2CsC60). The Na2MC60 compounds have face-centred cubic structures and are superconducting, with Tc = 12 K (M = Cs), 2.5 K (M = Rb) and 2.5 K (M = K); these Tcs are lower than those predicted on the basis of high-pressure studies6-8. This departure from the previous relationship between Tc and a0 for lattice parameters smaller than that of pristine C60 may provide new insights into what controls superconductivity in these materials.

AB - THE discovery1 of superconductivity, with a transition temperature Tc of 18 K, in potassium-doped C60 was followed by the synthesis of other superconducting M3C60 phases: Rb3C60 (Tc = 28K and 30 K; refs 2, 3), CsRb2C60 (Tc = 31K; ref. 4) and Cs2RbC60 (Tc = 33 K; ref. 4). A monotonic relationship is observed5 between Tc and lattice constant a0 for these face-centred cubic M3C0 compounds, all of which have a0 values larger than that of pure C60. Here we study this relationship over a wider range using mixed alkali compounds incorporating sodium (Na2MC60, where M is K, Rb or Cs) and lithium (Li2CsC60). The Na2MC60 compounds have face-centred cubic structures and are superconducting, with Tc = 12 K (M = Cs), 2.5 K (M = Rb) and 2.5 K (M = K); these Tcs are lower than those predicted on the basis of high-pressure studies6-8. This departure from the previous relationship between Tc and a0 for lattice parameters smaller than that of pristine C60 may provide new insights into what controls superconductivity in these materials.

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Superconductivity in sodium-and lithium-containing alkali-metal fullerides

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