TY - JOUR
T1 - Pressure evolution of the structure of (NH3)K3C60
AU - Margadonna, S.
AU - Prassides, K.
AU - Simoda, H.
AU - Iwasa, Y.
AU - Mézouar, M.
PY - 2001/10/1
Y1 - 2001/10/1
N2 - 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.
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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U2 - 10.1209/epl/i2001-00481-1
DO - 10.1209/epl/i2001-00481-1
M3 - Article
AN - SCOPUS:0035471047
VL - 56
SP - 61
EP - 66
JO - Journal de Physique (Paris), Lettres
JF - Journal de Physique (Paris), Lettres
SN - 0295-5075
IS - 1
ER -