TY - JOUR
T1 - Orbital ordering induces structural phase transition and the resistivity anomaly in iron pnictides
AU - Lv, Weicheng
AU - Wu, Jiansheng
AU - Phillips, Philip
PY - 2009/12/11
Y1 - 2009/12/11
N2 - We attribute the structural phase transition (SPT) in the parent compounds of the iron pnictides to orbital ordering. Due to the anisotropy of the dxz and dyz orbitals in the xy plane, a ferro-orbital ordering makes the orthorhombic structure more energetically favorable, thus inducing the SPT. In this orbital-ordered system, the sites with orbitals that do not order have higher energies. Scattering of the itinerant electrons by these localized two-level systems causes a resistivity anomaly upon the onset of the SPT. The proposed orbital ordering also leads to stripelike antiferromagnetism and anisotropy of the magnetic exchange couplings. This model is quantitatively consistent with available experimental observations.
AB - We attribute the structural phase transition (SPT) in the parent compounds of the iron pnictides to orbital ordering. Due to the anisotropy of the dxz and dyz orbitals in the xy plane, a ferro-orbital ordering makes the orthorhombic structure more energetically favorable, thus inducing the SPT. In this orbital-ordered system, the sites with orbitals that do not order have higher energies. Scattering of the itinerant electrons by these localized two-level systems causes a resistivity anomaly upon the onset of the SPT. The proposed orbital ordering also leads to stripelike antiferromagnetism and anisotropy of the magnetic exchange couplings. This model is quantitatively consistent with available experimental observations.
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U2 - 10.1103/PhysRevB.80.224506
DO - 10.1103/PhysRevB.80.224506
M3 - Article
AN - SCOPUS:76249103961
SN - 1098-0121
VL - 80
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 22
M1 - 224506
ER -