Abstract
AbstractWe present a detailed transport study in the organic superconductor κ‐(BEDT‐TTF)2Cu[N(CN)2]Br that is irradiated by X‐rays. Weak molecular disorder introduced by X‐ray irradiation induces the Anderson‐type localization insulating state from the strongly correlated metallic/superconducting state. The hydrostatic pressure to the localization insulator restores the metallic properties. These observations indicate that the stronger electron correlations upon approaching the Mott transition enhance Anderson‐type electron localization due to disorder introduced by X‐ray irradiation. In the metallic state with weak disorder or under pressure, the resistivity shows a T2 dependence, which suggests that the dominant electron scattering comes from the electron–electron correlations of a Fermi‐liquid metal. The coefficient A of the T2 term, however, seems not to follow the Fermi‐liquid theory fully as the origin of the T2 dependence in a case of the disorder effect. Further studies of the competition and/or cooperation of the Mott and Anderson transitions close to the Mott critical point are important for understanding the critical behavior of the electrons in real materials.
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