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Primitive description for Hall oscillations in the extreme quantum limit of (TMTSF)(2)ClO4

机译：Primitive description for Hall oscillations in the extreme quantum limit of (TMTSF)(2)ClO4

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(TMTSF)(2)ClO4 undergoes a cascade of Field Induced Spin Density Wave (FISDW) transitions as magnetic field are increased at low temperature. Each phase corresponds to a different integer quantum Hall state, nu, with rho(xy) = h/2ve(2). However, after a "final" transition at similar to 26 T there remain non quantized oscillations in transport and thermodynamic properties as particularly evident in recent Hall measurements. The nature of this high field state is unknown at present. In (TMTSF)(2)ClO4 an anion ordering transition leads to two Fermi surfaces. Here we introduce a simple description where one of the two Fermi surfaces is gapped by an FISDW at k(F1), nu = 0 while the other Fermi Surface lacks an FISDW gap. Satellite gaps (with index nu') at magnetic wave vectors G (G = eBb/h, b the interchain lattice constant), i.e. at k(F1) + nu'G, gaps are swept past the second Fermi surface at k(F2). This causes Hall sign changes at a frequency given by nu'G = k(F2) - k(F1) (or nh omega(c) = 2t(b): the transverse bandwidth) as observed. (C) 2007 Elsevier Ltd. All rights reserved.

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