An adaptive algorithm for n-body field expansions
Weinberg, Martin D.
1998-05-28
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124 records were found.
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: Journal reference 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
