Low Ordered Magnetic Moment by Off-Diagonal Frustration in Undoped Parent Compounds to Iron-Based High-Tc Superconductors

J. P. Rodriguez; E. H. Rezayi

doi:10.1103/PhysRevLett.103.097204

← Back to search

Low Ordered Magnetic Moment by Off-Diagonal Frustration in Undoped Parent Compounds to Iron-Based High-Tc Superconductors

J. P. Rodriguez, E. H. Rezayi

DOI 10.1103/PhysRevLett.103.097204 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

A Heisenberg model over the square lattice recently introduced by Si and Abrahams to describe local-moment magnetism in the new class of Fe-As high-Tc superconductors is analyzed in the classical limit and on a small cluster by exact diagonalization. In the case of spin-1 iron atoms, large enough Heisenberg exchange interactions between neighboring spin-1/2 moments on different iron 3d orbitals that frustrate true magnetic order lead to hidden magnetic order that violates Hund’s rule. It accounts for the low ordered magnetic moment observed by elastic neutron diffraction in an undoped parent compound to Fe-As superconductors. We predict that low-energy spin-wave excitations exist at wave numbers corresponding to either hidden Néel or hidden ferromagnetic order.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaOFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown