Local quantum criticality of an iron-pnictide tetrahedron

T. Tzen Ong, Piers Coleman

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Motivated by the close correlation between transition temperature (T c) and the tetrahedral bond angle of the As-Fe-As layer observed in the iron-based superconductors, we study the interplay between spin and orbital physics of an isolated iron-arsenide tetrahedron embedded in a metallic environment. Whereas the spin-Kondo effect is suppressed to low temperatures by Hund's coupling, the orbital degrees of freedom are expected to quantum mechanically quench at high temperatures, giving rise to an overscreened, non-Fermi liquid ground state. Translated into a dense environment, this critical state may play an important role in the superconductivity of these materials.

Original languageEnglish (US)
Article number107201
JournalPhysical review letters
Issue number10
StatePublished - Mar 5 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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