Heavy-anion solvation of polarity fluctuations in pnictidesG. A. Sawatzky1, I. S. Elfimov1, J. van den Brink2, 3 and J. Zaanen2
1 Department of Physics and Astronomy, University of British Columbia - Vancouver, BC V6T-1Z1, Canada
2 Institute Lorentz for Theoretical Physics, Leiden University - P.O. Box 9506, 2300 RA Leiden, The Netherlands, EU
3 Institute for Molecules and Materials, Radboud Universiteit Nijmegen - P.O. Box 9010, 6500 GL Nijmegen, The Netherlands, EU
received 16 January 2009; accepted in final form 15 March 2009; published April 2009
published online 22 April 2009
Once again the world of condensed matter has been surprised by the discovery of yet another class of high-temperature superconductors. The first reactions would of course be that these iron-pnictide– and iron-chalcogenide–based materials must in some way be related to the copper-oxide–based superconductors for which a large number of theories exist although a general consensus regarding the correct theory has not yet been reached. Here, we point out that the basic physical paradigm of the new iron-based superconductors is entirely different from the cuprates. Their fundamental properties, structural and electronic, are dominated by the exceptionally large pnictide electronic polarizabilities.
71.10.-w - Theories and models of many-electron systems.
74.20.-z - Theories and models of superconducting state.
© EPLA 2009