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arxiv: cond-mat/0011357 · v1 · submitted 2000-11-21 · ❄️ cond-mat.supr-con

Field-induced metal-insulator transition in a two-dimensional organic superconductor

J. Wosnitza (1) , S. Wanka (1) , J. Hagel (1) , H. v. Loehneysen (1) , J. S. Qualls (2) , J. S. Brooks (2) , E. Balthes (3) , J. A. Schlueter (4)
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U. Geiser (4) J. Mohtasham (5) R. W. Winter (5) G. L. Gard (5) ((1)Physikalisches Institut Univ. Karlsruhe Germany (2)NHMFL Florida State Univ. Tallahassee (3)High Magnetic Field Lab. MPI-Festkoerperforschung CNRS Grenoble France (4)Chem. Mat. Sci. Div. Argonne Nat. Lab. Illinois (5)Dep. of Chemistry Portland State University Oregon)
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classification ❄️ cond-mat.supr-con
keywords magnetoresistancemetal-insulatororganicoscillationssuperconductortransitionallowalphen
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The quasi-two-dimensional organic superconductor beta-(BEDT-TTF)_2SF_5CH_2CF_2SO_3 (T_c approx 4.4 K)shows very strong Shubnikov-de Haas (SdH) oscillations which are superimposed on a highly anomalous steady background magnetoresistance, R_b. Comparison with de Haas- van Alphen oscillations allow a reliable estimate of R_b which is crucial for the correct extraction of the SdH signal. At low temperatures and high magnetic fields insulating behavior evolves. The magnetoresistance data violate Kohler's rule, i.e., cannot be described within the framework of semiclassical transport theory, but converge onto a universal curve appropriate for dynamical scaling at a metal-insulator transition.

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