Phase transitions in the quantum Ising and rotor models with a long-range interaction

2001 ◽  
Vol 64 (18) ◽  
Author(s):  
Amit Dutta ◽  
J. K. Bhattacharjee
Keyword(s):  
Phase Transitions ◽  
Long Range ◽  
Range Interaction ◽  
Long Range Interaction

MICROSCOPIC MODELS OF PHASE TRANSITIONS IN THE CsHSO4 TYPE CRYSTALS

1991 ◽  
Vol 05 (17) ◽  
pp. 1147-1160
Author(s):  
K. A. RUSTAMOV ◽  
N. A. JAVADOV
Keyword(s):  
Phase Transitions ◽  
Phase Diagrams ◽  
Long Range ◽  
Brillouin Zone ◽  
Symmetry Analysis ◽  
Type Model ◽  
Slater Type ◽  
Range Interaction ◽  
Microscopic Models ◽  
Long Range Interaction

Microscopic models for the phase transitions described by two wave vectors (corresponding to the centre and the boundary of the Brillouin zone) in the CsHSO 4 type crystals are presented. On the basis of the symmetry analysis, obtained recently, molecular field and cluster approximations are considered. Limitation of this analysis is related to the large number of parameters. Possible phase diagrams within the MFA are presented. In the case of CA within the Slater type model in KDP the necessity of taking into account the parameter of long range interaction is shown.

Phase transitions in Josephson-junction arrays with long-range interaction

1993 ◽  
Vol 47 (2) ◽  
pp. 967-974 ◽  
Author(s):  
L. L. Sohn ◽  
M. S. Rzchowski ◽  
J. U. Free ◽  
M. Tinkham
Keyword(s):  
Phase Transitions ◽  
Josephson Junction ◽  
Long Range ◽  
Range Interaction ◽  
Josephson Junction Arrays ◽  
Long Range Interaction ◽  
Junction Arrays

scholarly journals ONE-DIMENSIONAL NON-SYMMETRIC WIDOM–ROWLINSON MODEL WITH LONG-RANGE INTERACTION

2007 ◽  
Vol 21 (09) ◽  
pp. 559-566 ◽  
Author(s):  
AZER KERIMOV
Keyword(s):  
Phase Transitions ◽  
Long Range ◽  
Symmetric Case ◽  
Range Interaction ◽  
One Dimensional ◽  
Long Range Interaction

The absence of phase transitions in one-dimensional Widom–Rowlinson model with long-range interaction is established in the non-symmetric case when different particles have different activity parameters.

Phase transformation and Raman spectra in BaTiO3 nanocrystals

2002 ◽  
Vol 718 ◽  
Author(s):  
Jian Yu ◽  
X. J. Meng ◽  
J.L. Sun ◽  
G.S. Wang ◽  
J.H. Chu
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Low Temperature ◽  
Long Range ◽  
Lattice Expansion ◽  
Inversion Symmetry ◽  
Range Interaction ◽  
Cooperative Phenomena ◽  
Long Range Interaction ◽  
Hydrothermal Methods

AbstractIn this paper, size-induced ferroelectricit yweakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) deriv ed b y low temperature hydrothermal methods, and they are w ellunderstood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalen t ionic nanocrystals. In cubic nc-BaTiO3, five modes centerd at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 modes found to be closely associated with OH - absorbed on grain boundaries.

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