Abstract
This work presents and analyzes electrical resistivity data on the organic superconductor and their anion-substituted alloys along the least conducting axis. Nonmagnetic disorder introduced by finite size domains of anion ordering on non-Fermi-liquid character of resistivity is investigated near the conditions of quantum criticality taking place at . The evolution of the -linear resistivity term with anion disorder shows a limited decrease in contrast with the complete suppression of the critical temperature as expected for unconventional superconductivity beyond a threshold value of . The resulting breakdown of scaling between both quantities is compared to the theoretical predictions of a linearized Boltzmann equation combined to the scaling theory of umklapp scattering in the presence of disorder-induced pair breaking for the carriers. The theory shows that quantum antiferromagnetic fluctuations, which are at the core of unconventional Cooper pairing and inelastic scattering of -linear resistivity in these systems, are weakly affected by disorder while the phase coherence responsible for a finite can be completely suppressed.
1 More- Received 17 June 2018
- Revised 21 August 2018
DOI:https://doi.org/10.1103/PhysRevB.98.115111
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