One-sign order parameter in iron based superconductor

Details One-sign order parameter in iron based superconductor One-sign order parameter in iron based superconductor

2011-10-31

arxiv.org/abs/1110.6922v2

Symmetry 2012, 4, 251-264

Physics

Condensed Matter

Superconductivity

SI added, references re-arranged, 14 pages, PDF format, Related work: http://www.ifw-dresden.de/institutes/iff/research/SC/arp

Scientific paper

10.3390/sym4010251

The onset of superconductivity at the transition temperature is marked by the onset of order, which is characterized by an energy gap. Most models of the iron-based superconductors find a sign-changing (s\pm) order parameter [1-6], with the physical implication that pairing is driven by spin fluctuations. Recent work, however, has indicated that LiFeAs has a simple isotropic order parameter [7-9] and spin fluctuations are not necessary [7,10], contrary to the models [1-6]. The strength of the spin fluctuations has been controversial [11,12], meaning that the mechanism of superconductivity cannot as yet be determined. Here we report the momentum dependence of the superconducting energy gap, where we find an anisotropy that rules out coupling through spin fluctuations and the sign change. The results instead suggest that orbital fluctuations assisted by phonons [13,14] are the best explanation for superconductivity.

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