scholarly journals Ferromagnetism in the Highly-Correlated Hubbard Model

2010 ◽  
Vol 168-169 ◽  
pp. 469-472 ◽  
Author(s):  
Valentin Yu. Irkhin ◽  
Alexander V. Zarubin
Keyword(s):  
Hubbard Model ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Strong Correlations ◽  
Cubic Lattices ◽  
Simple Cubic ◽  
Regions Of Stability ◽  
Highly Correlated ◽  
The Many

The Hubbard model with strong correlations is treated in the many-electron representation of the Hubbard's operators. The regions of stability of saturated and non-saturated ferromagnetism in the n–U plane for the square and simple cubic lattices are calculated. The role of the singularities of bare density of states for the magnetic phase diagram is discussed. A comparison with the results of previous works is performed.

scholarly journals Incommensurate Spin-Density Wave in Two-Dimensional Hubbard Model

2012 ◽  
Vol 190 ◽  
pp. 67-70 ◽  
Author(s):  
M.A. Timirgazin ◽  
Anatoly K. Arzhnikov ◽  
A.V. Vedyayev
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Ground State ◽  
Magnetic Phase ◽  
Density Wave ◽  
Spin Density Wave ◽  
Magnetic Phase Diagram ◽  
Two Dimensional ◽  
Magnetic Phases ◽  
Model Relation

We consider the magnetic phase diagram of the two-dimensional Hubbard model ona square lattice.We take into account both spiral and collinear incommensurate magnetic states.The possibility of phase separation of spiral magnetic phases is taken into consideration as well.Our study shows that all the listed phases appear to be the ground state at certain parametersof the model. Relation of the obtained results to real materials, e.g. Cu-based high-temperaturesuperconductors, is discussed.

Magnetic phase diagram of the anisotropic multi-band Hubbard model

2007 ◽  
Vol 244 (7) ◽  
pp. 2331-2337 ◽  
Author(s):  
P. G. J. van Dongen ◽  
C. Knecht ◽  
N. Blümer
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Multi Band

scholarly journals The role of mitosis in LDL transport through cultured endothelial cell monolayers

2011 ◽  
Vol 300 (3) ◽  
pp. H769-H776 ◽  
Author(s):  
Limary M. Cancel ◽  
John M. Tarbell
Keyword(s):  
Endothelial Cell ◽  
Water Flux ◽  
Bovine Aortic Endothelial Cell ◽  
Strong Correlations ◽  
Cell Monolayers ◽  
Ldl Transport ◽  
Dividing Cells ◽  
Highly Correlated ◽  
Mitosis Rate

We ( 7 ) have previously shown that leaky junctions associated with dying or dividing cells are the dominant pathway for LDL transport under convective conditions, accounting for >90% of the transport. We ( 8 ) have also recently shown that the permeability of bovine aortic endothelial cell monolayers is highly correlated with their rate of apoptosis and that inhibiting apoptosis lowers the permeability of the monolayers to LDL. To explore the role of mitosis in the leaky junction pathway, the microtubule-stabilizing agent paclitaxel was used to alter the rate of mitosis, and LDL flux and water flux ( Jv) were measured. Control monolayers had an average mitosis rate of 0.029%. Treatment with paclitaxel (2.5 μM) for 1.5, 3, 4.5, or 6 h yielded increasing rates of mitosis ranging from 0.099% to 1.03%. The convective permeability of LDL (Pe) increased up to fivefold, whereas Jv increased up to threefold, over this range of mitosis rates. We found strong correlations between the mitosis rate and both Pe and Jv. However, compared with our previous apoptosis study ( 8 ), we found that mitosis was only half as effective as apoptosis in increasing Pe. The results led us to conclude that while mitotsis-related leaky junctions might play a role in the initial infiltration of LDL into the artery wall, the progression of atherosclerosis might be more closely correlated with apoptosis-related leaky junctions.

DC Magnetic Susceptibility of CeCoGe2.36Si0.64 under High Pressure

2012 ◽  
Vol 190 ◽  
pp. 405-408
Author(s):  
J.J. Larrea ◽  
J. Teyssier ◽  
H. Ronnow ◽  
M. Müller ◽  
A. Sidorenko ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Susceptibility ◽  
Heavy Fermion ◽  
Pressure Range ◽  
Magnetic Phase ◽  
Ambient Pressure ◽  
Quantum Critical Point ◽  
Magnetic Phase Diagram ◽  
Antiferromagnetic Order

We report an investigation of the magnetic phase diagram of the heavy fermion com-pound CeCoGe2.36Si0.64 using DC magnetic susceptibility measurements under high pressure upto 10 kbar. The antiferromagnetic order that develops at ambient pressure below about 5.5 Kremains essentially unaffected by pressure in the investigated pressure range up to 10 kbar. Onthe other hand, moderate magnetic fields appear to induce a quantum critical point in a sam-ple subject to a pressure of 2 kbar. We discuss the role of disorder in the series of compoundsCeCoGe3−xSix.

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