Pressure evolution of the structure of (NH3)K3C60

S. Margadonna; K. Prassides; H. Simoda; Y. Iwasa; M. Mézouar

doi:10.1209/epl/i2001-00481-1

Pressure evolution of the structure of (NH₃)K₃C₆₀

S. Margadonna, K. Prassides, H. Simoda, Y. Iwasa, M. Mézouar

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The structural features of the ammoniated (NH₃)K₃C₆₀ fulleride are studied by synchrotron X-ray powder diffraction as a function of pressure to 6.7 GPa. A superstructure appears at ∼1 GPa as a result of orientational ordering of both the C₆₀ and K⁺_-NH₃ units (orthorhombic symmetry, space group Fddd). The pressure evolution of the lattice constants reveals a highly compressible, strongly anisotropic structure. The centre-to-centre interfullerene separations of ∼10.40 Å in the basal plane are comparable to those in the superconducting cubic analogue, RbCs₂C₆₀ and evidently sufficiently short to drive the system superconducting, despite its low crystal symmetry.

Original language	English
Pages (from-to)	61-66
Number of pages	6
Journal	Europhysics Letters
Volume	56
Issue number	1
DOIs	https://doi.org/10.1209/epl/i2001-00481-1
Publication status	Published - 2001 Oct 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Margadonna, S.

AU - Prassides, K.

AU - Simoda, H.

AU - Iwasa, Y.

AU - Mézouar, M.

PY - 2001/10/1

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AB - The structural features of the ammoniated (NH3)K3C60 fulleride are studied by synchrotron X-ray powder diffraction as a function of pressure to 6.7 GPa. A superstructure appears at ∼1 GPa as a result of orientational ordering of both the C60 and K+-NH3 units (orthorhombic symmetry, space group Fddd). The pressure evolution of the lattice constants reveals a highly compressible, strongly anisotropic structure. The centre-to-centre interfullerene separations of ∼10.40 Å in the basal plane are comparable to those in the superconducting cubic analogue, RbCs2C60 and evidently sufficiently short to drive the system superconducting, despite its low crystal symmetry.

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Pressure evolution of the structure of (NH₃)K₃C₆₀

Abstract

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