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Comment: 4 pages, 4 figures
Comment: To be published in proceedings of the Notre Dame Workshop on the Possibility of Room Temperature Superconductivity, June 2005 v.2: an apposite epigraph added
Comment: This correspondence concerns a paper by M. M. Qazilbash, et al, Nature Phys. 5, 647 (2009)
Comment: Final version accepted for publication
A newly discovered family of the Fe-based superconductors is isostructural with the so-called 122 family of Fe pnictides, but has a qualitatively different doping state. Early experiments indicate that superconductivity is nodeless, yet prerequisites for the $s_\pm$ nodeless state (generally believed to be realized in Fe superconductors) are missing. It is tempting to assign a $d-$ wave symmetry to the new materials, and it does seem at first glance that such a state may be nodeless. Yet a more careful analysis shows that it is not possible, given the particular 122 crystallography, and that the possible choice of admissible symmetries is severly limited: it is either a conventional single-sign $s_{+}$ state, or another $s_\pm$ state, different from the one believed to be present in other Fe-based superconductors.
Comment: 4 pages, ps figs embedded
Comment: 4 pages, no figs
Comment: 4 pages, embedded postscript figires
Comment: 4 pages, 6 figs
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