Magnetic properties of the three-band Hubbard model

Th Maier; M. B. Zölfl; Th Pruschke; J. Keller

doi:10.1007/s100510050625

Magnetic properties of the three-band Hubbard model

Th Maier, M. B. Zölfl, Th Pruschke, J. Keller

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

We present magnetic properties of the three-band Hubbard model in the para- and antiferromagnetic phase on a hypercubic lattice calculated with the Dynamical Mean-Field Theory (DMFT). To allow for solutions with broken spin-symmetry we extended the approach to lattices with AB-like structure. Above a critical sublattice magnetization m_d ≈ 0.5 one can observe rich structures in the spectral-functions similar to the t-J model which can be related to the well known bound states for one hole in the Neél-background. In addition to the one-particle properties we discuss the static spin-susceptibility in the paramagnetic state at the points q = 0 and q = (π, π, π, ⋯) for different dopings δ. The δ-T-phase-diagram exhibits an enhanced stability of the antiferromagnetic state for electron-doped systems in comparison to hole-doped. This asymmetry in the phase diagram is in qualitative agreement with experiments for high-T_c materials.

Original language	English
Pages (from-to)	377-383
Number of pages	7
Journal	Zeitschrift für Physik B Condensed Matter
Volume	7
Issue number	3
DOIs	https://doi.org/10.1007/s100510050625
State	Published - Feb 1 1999
Externally published	Yes

Keywords

71.27.+a Strongly correlated electron systems
71.30.+h Metal-insulator transitions and other electronic transitions
75.10.-b General theory and models of magnetic ordering

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10.1007/s100510050625

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title = "Magnetic properties of the three-band Hubbard model",

abstract = "We present magnetic properties of the three-band Hubbard model in the para- and antiferromagnetic phase on a hypercubic lattice calculated with the Dynamical Mean-Field Theory (DMFT). To allow for solutions with broken spin-symmetry we extended the approach to lattices with AB-like structure. Above a critical sublattice magnetization md ≈ 0.5 one can observe rich structures in the spectral-functions similar to the t-J model which can be related to the well known bound states for one hole in the Ne{\'e}l-background. In addition to the one-particle properties we discuss the static spin-susceptibility in the paramagnetic state at the points q = 0 and q = (π, π, π, ⋯) for different dopings δ. The δ-T-phase-diagram exhibits an enhanced stability of the antiferromagnetic state for electron-doped systems in comparison to hole-doped. This asymmetry in the phase diagram is in qualitative agreement with experiments for high-Tc materials.",

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AU - Maier, Th

AU - Zölfl, M. B.

AU - Pruschke, Th

AU - Keller, J.

PY - 1999/2/1

Y1 - 1999/2/1

N2 - We present magnetic properties of the three-band Hubbard model in the para- and antiferromagnetic phase on a hypercubic lattice calculated with the Dynamical Mean-Field Theory (DMFT). To allow for solutions with broken spin-symmetry we extended the approach to lattices with AB-like structure. Above a critical sublattice magnetization md ≈ 0.5 one can observe rich structures in the spectral-functions similar to the t-J model which can be related to the well known bound states for one hole in the Neél-background. In addition to the one-particle properties we discuss the static spin-susceptibility in the paramagnetic state at the points q = 0 and q = (π, π, π, ⋯) for different dopings δ. The δ-T-phase-diagram exhibits an enhanced stability of the antiferromagnetic state for electron-doped systems in comparison to hole-doped. This asymmetry in the phase diagram is in qualitative agreement with experiments for high-Tc materials.

AB - We present magnetic properties of the three-band Hubbard model in the para- and antiferromagnetic phase on a hypercubic lattice calculated with the Dynamical Mean-Field Theory (DMFT). To allow for solutions with broken spin-symmetry we extended the approach to lattices with AB-like structure. Above a critical sublattice magnetization md ≈ 0.5 one can observe rich structures in the spectral-functions similar to the t-J model which can be related to the well known bound states for one hole in the Neél-background. In addition to the one-particle properties we discuss the static spin-susceptibility in the paramagnetic state at the points q = 0 and q = (π, π, π, ⋯) for different dopings δ. The δ-T-phase-diagram exhibits an enhanced stability of the antiferromagnetic state for electron-doped systems in comparison to hole-doped. This asymmetry in the phase diagram is in qualitative agreement with experiments for high-Tc materials.

KW - 71.27.+a Strongly correlated electron systems

KW - 71.30.+h Metal-insulator transitions and other electronic transitions

KW - 75.10.-b General theory and models of magnetic ordering

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JO - Zeitschrift für Physik B Condensed Matter

JF - Zeitschrift für Physik B Condensed Matter

IS - 3

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Magnetic properties of the three-band Hubbard model

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