Electron localization in the strongly correlated organic systemκ−(BEDT−TTF)2Xprobed with nuclear magnetic resonanceC13−NMR
- 31 August 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 70 (6), 060510
- https://doi.org/10.1103/physrevb.70.060510
Abstract
salts exhibit a wide range of properties from superconductivity to magnetic ordering. The phase diagram of this system has been understood as the competition between anti-ferromagnetic insulating behavior and superconductivity. The system has been well explained using a parameter, U/W, as well as the high cuprates. , however, behaved as an insulator without magnetic ordering. This salt cannot be described by the phase diagram described by the competition between superconductivity and magnetism. It is interesting to explore the nature of this insulating phase with an eye toward understanding the universal phase diagram of the system. Magnetic frustration due to the triangular spin lattice has recently been reported for from -nuclear magnetic resonance (NMR) study. To investigate the insulating properties of this salt, we characterized it using . In contrast to previous studies, at low temperatures, we observed line broadenings that were proportional to the hyperfine coupling constants, which suggested inhomogeous electron localization. We also observed antiferromagnetic fluctuations which, as is the case with other salts, intensified with decreasing temperature. To understand the electronic properties of system, in addition to the U/W, the electron localization effect from the relatively narrow bandwidth is important.
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