Abstract
We investigate the phase diagram of a two-band frustrated Hubbard model in the framework of dynamical mean-field theory. While a first-order phase transition occurs from a paramagnetic (PM) metal to an antiferromagnetic (AF) insulator when both bands are equally frustrated, an intermediate AF metallic phase appears in each band at different Uc values if only one of the two bands is frustrated, resulting in continuous orbital-selective phase transitions from PM metal to AF metal and AF metal to AF insulator, regardless of the strength of the Ising Hund's coupling. We argue that our minimal-model calculations capture the frustration behavior in the undoped iron-pnictide superconductors as well as local quantum-fluctuation effects and that the intermediate phases observed in our results are possibly related to the puzzling AF metallic state with small staggered magnetization observed in these systems as well as to the pseudogap features observed in optical experiments.
| Original language | English |
|---|---|
| Article number | 220506 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 81 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - Jun 24 2010 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Possible origin of the reduced ordered magnetic moment in iron pnictides : A dynamical mean-field theory study. / Lee, Hunpyo; Zhang, Yu Zhong; Jeschke, Harald Olaf; Valentí, Roser.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 22, 220506, 24.06.2010.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Possible origin of the reduced ordered magnetic moment in iron pnictides
T2 - A dynamical mean-field theory study
AU - Lee, Hunpyo
AU - Zhang, Yu Zhong
AU - Jeschke, Harald Olaf
AU - Valentí, Roser
PY - 2010/6/24
Y1 - 2010/6/24
N2 - We investigate the phase diagram of a two-band frustrated Hubbard model in the framework of dynamical mean-field theory. While a first-order phase transition occurs from a paramagnetic (PM) metal to an antiferromagnetic (AF) insulator when both bands are equally frustrated, an intermediate AF metallic phase appears in each band at different Uc values if only one of the two bands is frustrated, resulting in continuous orbital-selective phase transitions from PM metal to AF metal and AF metal to AF insulator, regardless of the strength of the Ising Hund's coupling. We argue that our minimal-model calculations capture the frustration behavior in the undoped iron-pnictide superconductors as well as local quantum-fluctuation effects and that the intermediate phases observed in our results are possibly related to the puzzling AF metallic state with small staggered magnetization observed in these systems as well as to the pseudogap features observed in optical experiments.
AB - We investigate the phase diagram of a two-band frustrated Hubbard model in the framework of dynamical mean-field theory. While a first-order phase transition occurs from a paramagnetic (PM) metal to an antiferromagnetic (AF) insulator when both bands are equally frustrated, an intermediate AF metallic phase appears in each band at different Uc values if only one of the two bands is frustrated, resulting in continuous orbital-selective phase transitions from PM metal to AF metal and AF metal to AF insulator, regardless of the strength of the Ising Hund's coupling. We argue that our minimal-model calculations capture the frustration behavior in the undoped iron-pnictide superconductors as well as local quantum-fluctuation effects and that the intermediate phases observed in our results are possibly related to the puzzling AF metallic state with small staggered magnetization observed in these systems as well as to the pseudogap features observed in optical experiments.
UR - http://www.scopus.com/inward/record.url?scp=77956316160&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77956316160&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.81.220506
DO - 10.1103/PhysRevB.81.220506
M3 - Article
AN - SCOPUS:77956316160
VL - 81
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 22
M1 - 220506
ER -