Abstract
Abstract C60 powder samples of varying impurity content have been investigated by neutron scattering techniques. For Q > 2.5 Å−1 (Q = transferred momentum) strong elastic diffuse scattering is found below Tc ~ 260 K providing evidence of static disorder in the low temperature phase. The elastic scattering increases on cooling from Tc to 150 K but remains virtually constant below this temperature. There is no marked dependence on the impurity level. For Q > 2.5 Å−1 elastic diffuse scattering obeying a sin(QR)/(QR) law is observed both above and below the phase transition (R= radius of C60 molecule). This scattering is nearly independent of temperature, however, depends strongly on the amount of impurities in the sample. In order to account for the unusually strong elastic diffuse scattering intensity model calculations have been performed which relate orientational disorder in C60 to the elastic scattering observed in powder samples.
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