Magnetic phase diagram of the one-band Hubbard Hamiltonian with application to high-Tcsuperconducting oxides

<div><div><div><p>The global magnetic phase diagram for fused azulene oligomers is obtained by using a fermionic Hubbard Hamiltonian, a intermediate model between the molecular (Pariser-Parr-Pople empiric Hamiltonian) and spin-1/2 antiferromagnetic Heisenberg approaches. As a function of the on-site coulomb repulsion and the oligomer size we show that fused azulene transitions from a singlet (S = 0) to a higher-spin (S = 1, 2, 3) ground state. Near the quantum magnetic phase transition the electric dipole moment, present on fused azulene molecules, couples with the magnetic moment leading to a divergent magnetoelectric susceptibility at the boundary lines of the magnetic phase diagram. These spontaneous electric and magnetic polarizations, together with the magnetoelectric coupling between them, indicate that fuzed azulene molecules are potentially strong candidates for purely organic multiferroic materials.</p></div></div></div>

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Exact magnetic phase diagram of the one-dimensional Hubbard model

Physica B Condensed Matter ◽

10.1016/s0921-4526(99)01156-4 ◽

2000 ◽

Vol 281-282 ◽

pp. 831-833

Author(s):

C Yang ◽

A.N Kocharian ◽

Y.L Chiang

Keyword(s):

Phase Diagram ◽

Hubbard Model ◽

Magnetic Phase ◽

Magnetic Phase Diagram ◽

One Dimensional ◽

The One

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Magnetoelectric Coupling on the Fused Azulene Oligomers

10.26434/chemrxiv.14347754.v1 ◽

2021 ◽

Author(s):

Alexandra Valentim ◽

Daniel J. Garcia ◽

João A. Plascak

Keyword(s):

Phase Diagram ◽

Ground State ◽

Magnetic Phase ◽

Magnetic Phase Diagram ◽

Coulomb Repulsion ◽

Magnetoelectric Coupling ◽

Multiferroic Materials ◽

Hubbard Hamiltonian ◽

Higher Spin ◽

Boundary Lines

<div><div><div><p>The global magnetic phase diagram for fused azulene oligomers is obtained by using a fermionic Hubbard Hamiltonian, a intermediate model between the molecular (Pariser-Parr-Pople empiric Hamiltonian) and spin-1/2 antiferromagnetic Heisenberg approaches. As a function of the on-site coulomb repulsion and the oligomer size we show that fused azulene transitions from a singlet (S = 0) to a higher-spin (S = 1, 2, 3) ground state. Near the quantum magnetic phase transition the electric dipole moment, present on fused azulene molecules, couples with the magnetic moment leading to a divergent magnetoelectric susceptibility at the boundary lines of the magnetic phase diagram. These spontaneous electric and magnetic polarizations, together with the magnetoelectric coupling between them, indicate that fuzed azulene molecules are potentially strong candidates for purely organic multiferroic materials.</p></div></div></div>

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NEUTRON DIFFRACTION AND MAGNETIZATION STUDY OF THE MAGNETIC PHASE DIAGRAM OF UAs0.75Se0.25 SINGLE CRYSTAL

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19888217 ◽

1988 ◽

Vol 49 (C8) ◽

pp. C8-479-C8-480 ◽

Cited By ~ 3

Author(s):

M. Kuznietz ◽

P. Burlet ◽

J. Rossat-Mignod ◽

O. Vogt ◽

K. Mattenberger ◽

...

Keyword(s):

Phase Diagram ◽

Neutron Diffraction ◽

Single Crystal ◽

Magnetic Phase ◽

Magnetic Phase Diagram ◽

Magnetization Study

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MAGNETIC PROPERTIES OF PSEUDO-BINARY Mn1−xFexSn2 ALLOYS

International Journal of Modern Physics B ◽

10.1142/s0217979293001852 ◽

1993 ◽

Vol 07 (01n03) ◽

pp. 867-870 ◽

Cited By ~ 3

Author(s):

H. SHIRAISHI ◽

T. HORI ◽

Y. YAMAGUCHI ◽

S. FUNAHASHI ◽

K. KANEMATSU

Keyword(s):

Field Theory ◽

Phase Diagram ◽

Magnetic Properties ◽

Magnetic Susceptibility ◽

High Temperature ◽

Magnetic Structure ◽

Magnetic Phase ◽

Magnetic Phase Diagram ◽

Molecular Field ◽

Magnetic Phases

The magnetic susceptibility measurements have been made on antiferromagnetic compounds Mn1–xFexSn2 and the magnetic phase diagram was illustrated. The high temperature magnetic phases I and III, major phases, were analyzed on the basis of molecular field theory and explained the change of magnetic structure I⇌III occured at x≈0.8.

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