Abstract
We report on dc and microwave experiments of the low-dimensional organic conductors and along the , , and directions. In the normal state of below , the dc resistivity follows a power law with and proportional to while . Above the exponents extracted from the data for the and axes are consistent with what is to be expected for a system of coupled one-dimensional chains (Luttinger liquid) and a dimensional crossover at a temperature of about . The axis shows anomalous exponents that could be attributed to a large crossover between these two regimes. The contactless microwave measurements of single crystals along the axis reveal an anomaly between 25 and which is not understood yet. The organic superconductor is more a two-dimensional metal with an anisotropy of approximately 2 at all temperatures. Such a low anisotropy is unexpected in view of the transfer integrals. Slight indications to one-dimensionality are found in the temperature dependent transport only above . Even along the least conducting direction no region with semiconducting behavior is revealed up to room temperature.
3 More- Received 13 September 2004
DOI:https://doi.org/10.1103/PhysRevB.71.075104
©2005 American Physical Society