Abstract
Motivated by the unexplored complexity of phases present in the multiorbital Hubbard model, we analyze in this work the behavior of a degenerate two-orbital anisotropic Hubbard model at half-filling where both orbitals have equal bandwidths and one orbital is constrained to be paramagnetic (PM), while the second one is allowed to have an antiferromagnetic (AF) solution. Such a model may be relevant for a large class of correlated materials with competing magnetic states in different orbitals such as the recently discovered Fe-based superconductors. Using a dynamical cluster approximation we observe that unique orbital selective phase transitions appear regardless of the strength of the Ising Hund's rule coupling Jz. Moreover, the PM orbital undergoes a transition from a Fermi liquid (FL) to a Mott insulator through a non-FL phase while the AF orbital shows a transition from a FL to an AF insulator through an AF metallic phase. We discuss the implications of the results in the context of the Fe-based superconductors.
| Original language | English |
|---|---|
| Article number | 020401 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 84 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jul 7 2011 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Orbital-selective phase transition induced by different magnetic states : A dynamical cluster approximation study. / Lee, Hunpyo; Zhang, Yu Zhong; Jeschke, Harald Olaf; Valentí, Roser.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 2, 020401, 07.07.2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Orbital-selective phase transition induced by different magnetic states
T2 - A dynamical cluster approximation study
AU - Lee, Hunpyo
AU - Zhang, Yu Zhong
AU - Jeschke, Harald Olaf
AU - Valentí, Roser
PY - 2011/7/7
Y1 - 2011/7/7
N2 - Motivated by the unexplored complexity of phases present in the multiorbital Hubbard model, we analyze in this work the behavior of a degenerate two-orbital anisotropic Hubbard model at half-filling where both orbitals have equal bandwidths and one orbital is constrained to be paramagnetic (PM), while the second one is allowed to have an antiferromagnetic (AF) solution. Such a model may be relevant for a large class of correlated materials with competing magnetic states in different orbitals such as the recently discovered Fe-based superconductors. Using a dynamical cluster approximation we observe that unique orbital selective phase transitions appear regardless of the strength of the Ising Hund's rule coupling Jz. Moreover, the PM orbital undergoes a transition from a Fermi liquid (FL) to a Mott insulator through a non-FL phase while the AF orbital shows a transition from a FL to an AF insulator through an AF metallic phase. We discuss the implications of the results in the context of the Fe-based superconductors.
AB - Motivated by the unexplored complexity of phases present in the multiorbital Hubbard model, we analyze in this work the behavior of a degenerate two-orbital anisotropic Hubbard model at half-filling where both orbitals have equal bandwidths and one orbital is constrained to be paramagnetic (PM), while the second one is allowed to have an antiferromagnetic (AF) solution. Such a model may be relevant for a large class of correlated materials with competing magnetic states in different orbitals such as the recently discovered Fe-based superconductors. Using a dynamical cluster approximation we observe that unique orbital selective phase transitions appear regardless of the strength of the Ising Hund's rule coupling Jz. Moreover, the PM orbital undergoes a transition from a Fermi liquid (FL) to a Mott insulator through a non-FL phase while the AF orbital shows a transition from a FL to an AF insulator through an AF metallic phase. We discuss the implications of the results in the context of the Fe-based superconductors.
UR - http://www.scopus.com/inward/record.url?scp=79961185619&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79961185619&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.84.020401
DO - 10.1103/PhysRevB.84.020401
M3 - Article
AN - SCOPUS:79961185619
VL - 84
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 2
M1 - 020401
ER -