How to map a pseudogap?

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A pseudogap (PG) is believed to be responsible for the non Fermi-liquid normal state of cuprate superconductors. In particular, field induced PG collapse causes negative longitudinal magnetoresistance (MR), for details, see V.N. Zavaritsky, M. Springford, A.S. Alexandrov, cond-mat/0006089; cond-mat/0011192. The PG collapses because of spin-splitting of the polaron band while the orbital effects are irrelevant. Recently these conclusions, including the Zeeman relation, kBT*=gBpg, which couples the PG temperature, T*, and the PG closing field, Bpg, were reaffirmed by T. Shibauchi et al., Phys. Rev. Lett. 86, 5763 (2001). It will demonstrate that the article by T. Shibauchi et al. lacks consistency and its conclusions are based on fallacious propositions and unsupported by the authors' own experimental results.