Abstract
We 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.
Original language | English |
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Pages (from-to) | 947-952 |
Number of pages | 6 |
Journal | Physica Status Solidi (B) Basic Research |
Volume | 249 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2012 May |
Keywords
- Anderson insulator
- Mott transition
- Randomness
- X-ray irradiation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics