Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-02-16
Phys. Rev. B80, 020505(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4+ pages, 3 figures, final version
Scientific paper
Some of the high Tc iron pnictides contain magnetic rare-earth elements, raising the question of how the existence and tunability of a d-electron antiferromagnetic order influences the heavy fermion behavior of the f-moments. With CeOFeP and CeOFeAs in mind as prototypes, we derive an extended Anderson lattice model appropriate for these quaternary systems. We show that the Kondo screening of the f-moments are efficiently suppressed by the d-electron ordering. We also argue that, inside the d-electron ordered state (as in CeOFeAs), the f-moments provide a rare realization of a quantum frustrated magnet with competing J1-J2-J3 interactions in an effective square lattice. Implications for the heavy fermion physics in broader contexts are also discussed.
Dai Jianhui
Si Qimiao
Zhu Jian-Xin
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