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Magnetic-Field Induced Crossover of Superconducting Percolation Regimes in the Layered Organic Mott System κ-(BEDT-TTF)2Cu[N(CN)2]Cl

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Müller,  J.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Brandenburg,  J.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Müller, J., Brandenburg, J., & Schlueter, J. A. (2009). Magnetic-Field Induced Crossover of Superconducting Percolation Regimes in the Layered Organic Mott System κ-(BEDT-TTF)2Cu[N(CN)2]Cl. Physical Review Letters, 102: 047004, pp. 047004-1-047004-4. doi:10.1103/PhysRevLett.102.047004.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-259E-3
Abstract
Fluctuation spectroscopy is used to investigate the organic bandwidth-controlled Mott system kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl. We find evidence for percolative-type superconductivity in the spatially inhomogeneous coexistence region of antiferromagnetic insulating and superconducting states. When the superconducting transition is driven by a magnetic field, percolation seems to be dominated by instable superconducting clusters upon approaching T-c(B) from above, before a "classical" type of percolation is resumed at low fields, dominated by the fractional change of superconducting clusters. The 1/f noise is resolved into Lorentzian spectra in the crossover region, where the action of an individual fluctuator is enhanced, pointing to a mesoscopic phase separation.