1/f noise in the superconducting state of quasi-two-dimensional organic conductors (BEDT-TTF){sub 2}X - a comparative study.
We report on resistance noise spectroscopy measurements in the superconducting state of two quasi-two-dimensional organic superconductors. The superconducting state of {beta}{double_prime}-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} is homogeneous, whereas {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Cl under pressure is located in the inhomogeneous region of the phase diagram, where antiferromanetic/insulating and superconducting phases coexist. For the latter material, the finite noise level even well below T{sub c} is understood in the framework of a random resistor network. Furthermore, the noise provides evidence for percolation-type superconductivity. For homogeneous {beta}{double_prime}-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}, however, no indications of percolation effects are found: the noise in the superconducting state vanishes and the normalized noise level S{sub R}/R{sup 2} is generally one order of magnitude lower.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); German Research Foundation (DFG)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 985149
- Report Number(s):
- ANL/MSD/JA-67214; TRN: US201016%%1823
- Journal Information:
- Physica B, Vol. 405, Issue 2010
- Country of Publication:
- United States
- Language:
- ENGLISH
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