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Title: Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Cl.

Abstract

Fluctuation spectroscopy is used to investigate the organic bandwidth-controlled Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 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{sub 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.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); DFG
OSTI Identifier:
952414
Report Number(s):
ANL/MSD/JA-64127
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US200913%%499
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 102; Journal Issue: 2009; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; MAGNETIC FIELDS; SPECTRA; SPECTROSCOPY; SUPERCONDUCTIVITY; BEDT-TTF; COPPER COMPLEXES; TRANSITION TEMPERATURE

Citation Formats

Mueller, J, Brandenberg, J, Schlueter, J A, Materials Science Division, and Max Planck Inst. for Chemical Physics of Solids. Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Cl.. United States: N. p., 2009. Web. doi:10.1103/PhysRevLett.102.047004.
Mueller, J, Brandenberg, J, Schlueter, J A, Materials Science Division, & Max Planck Inst. for Chemical Physics of Solids. Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Cl.. United States. https://doi.org/10.1103/PhysRevLett.102.047004
Mueller, J, Brandenberg, J, Schlueter, J A, Materials Science Division, and Max Planck Inst. for Chemical Physics of Solids. 2009. "Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Cl.". United States. https://doi.org/10.1103/PhysRevLett.102.047004.
@article{osti_952414,
title = {Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Cl.},
author = {Mueller, J and Brandenberg, J and Schlueter, J A and Materials Science Division and Max Planck Inst. for Chemical Physics of Solids},
abstractNote = {Fluctuation spectroscopy is used to investigate the organic bandwidth-controlled Mott system {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 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{sub 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.},
doi = {10.1103/PhysRevLett.102.047004},
url = {https://www.osti.gov/biblio/952414}, journal = {Phys. Rev. B},
issn = {0031-9007},
number = 2009,
volume = 102,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2009},
month = {Thu Jan 01 00:00:00 EST 2009}
}