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Ong TT, Coleman P. Local quantum criticality of an iron-pnictide tetrahedron. Phys Rev Lett. 2012;108(10):107201doi: 10.1103/PhysRevLett.108.107201.
Ong, T. T., & Coleman, P. (2012). Local quantum criticality of an iron-pnictide tetrahedron. Physical review letters, 108(10), 107201. https://doi.org/10.1103/PhysRevLett.108.107201
Ong, T Tzen, and Coleman, Piers. "Local quantum criticality of an iron-pnictide tetrahedron." Physical review letters vol. 108,10 (2012): 107201. doi: https://doi.org/10.1103/PhysRevLett.108.107201
Ong TT, Coleman P. Local quantum criticality of an iron-pnictide tetrahedron. Phys Rev Lett. 2012 Mar 09;108(10):107201. doi: 10.1103/PhysRevLett.108.107201. Epub 2012 Mar 05. PMID: 22463447.
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Phys Rev Lett. 2012 Mar 09;108(10):107201. doi: 10.1103/PhysRevLett.108.107201. Epub 2012 Mar 05.

Local quantum criticality of an iron-pnictide tetrahedron.

Physical review letters

T Tzen Ong, Piers Coleman

Affiliations

  1. Center for Materials Theory, Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

PMID: 22463447 DOI: 10.1103/PhysRevLett.108.107201

Abstract

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.

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