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

Jens Müller, Jens Brandenburg, and John A. Schlueter
Phys. Rev. Lett. 102, 047004 – Published 28 January 2009

Abstract

Fluctuation spectroscopy is used to investigate the organic bandwidth-controlled Mott system κ(BEDTTTF)2Cu[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 Tc(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.

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  • Received 3 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.047004

©2009 American Physical Society

Authors & Affiliations

Jens Müller* and Jens Brandenburg

  • Max Planck Institute for Chemical Physics of Solids, Nöthnitzer-Strasse 40, 01187 Dresden, Germany

John A. Schlueter

  • Argonne National Laboratory, Materials Science Division, Argonne, Illinois 60439, USA

  • *mueller@cpfs.mpg.de

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Vol. 102, Iss. 4 — 30 January 2009

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