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[en] The positron lifetime is related to the temperature in C60, namely, the positron lifetime increases as a function of increasing temperature between 10 and 300K. In this paper we adopted the extended Su-Schrieffer-Heeger (SSH) model, by using the method of the Green's function at finite temperature, then we deduced a relation of the positron lifetime and temperature. The results show that the theoretical calculation may be in accordance with experiment. (orig.)
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