Abstract
The quasi-one-dimensional organic Bechgaard salt displays spin-density-wave (SDW) order and superconductivity in close proximity in the temperature-pressure phase diagram. We have measured its normal-state electrical resistivity as a function of temperature and pressure, in the limit. At the critical pressure where SDW order disappears, down to the lowest measured temperature (0.1 K). With increasing pressure, acquires a curvature that is well described by , where the strength of the linear term, measured by the coefficient, is found to scale with the superconducting transition temperature . This correlation between and strongly suggests that scattering and pairing in have a common origin, most likely rooted in the antiferromagnetic spin fluctuations associated with SDW order. Analysis of published resistivity data on the iron-pnictide superconductor reveals a detailed similarity with , suggesting that antiferromagnetic fluctuations play a similar role in the pnictides.
- Received 19 August 2009
DOI:https://doi.org/10.1103/PhysRevB.80.214531
©2009 American Physical Society