scholarly journals The study of magnetic dendrimer models by the Wang-Landau method

2019 ◽  
pp. 1-12
Author(s):  
Magomed Magomedov ◽  
Akai Murtazaev ◽  
M.M. Isaeva
Keyword(s):  
Heat Capacity ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Exchange Interaction ◽  
Density Of States ◽  
Ground State ◽  
System Size ◽  
System Behavior

By the Wang-Landau algorithm of the entropy Monte Carlo method the thermodynamic properties of the magnetic dendrimers at different values of the exchange interaction are studied. The density of states of the system are calculated and the magnetic structure of the ground state defined. The temperature dependence of the various thermodynamic parameters, such as the magnetization m, entropy S, the internal energy E and the heat capacity C are calculated. It is shown that in the studied model dendrimer magnetic influence of surface units in the overall picture of the system behavior with increasing system size unabated.

scholarly journals Исследование моделей магнитных дендримеров методом Ванга--Ландау

2020 ◽  
Vol 62 (5) ◽  
pp. 705
Author(s):  
М.А. Магомедов ◽  
М.М. Исаева
Keyword(s):  
Heat Capacity ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Ground State ◽  
State Density ◽  
System State ◽  
Surface Sites ◽  
The Monte Carlo Method ◽  
Temperature Dependences ◽  
Ground State Structures

Abstract The thermodynamic properties of the models of magnetic dendrimers were studied by the Monte Carlo method. The system state density is calculated; the ground state structures are determined. The temperature dependences of magnetization m , entropy S , internal energy E , and heat capacity C are calculated. It is shown that in the investigated model of dendrimer, the effect of the surface sites on the general behavior of the system does not become weaker with growing sizes of the system.

DENSITY-OF-STATES MONTE CARLO METHOD FOR SIMULATION OF TWO-DIMENSIONAL RANDOM BOND POTTS MODEL

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2745-2751
Author(s):  
YOU YU ◽  
HE-PING YING ◽  
QING-HU CHEN ◽  
ZHENG-QUAN PAN
Keyword(s):  
Phase Transition ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Thermodynamic Properties ◽  
Density Of States ◽  
Potts Model ◽  
Bimodal Distribution ◽  
The Self ◽  
Two Dimensional ◽  
Finite Lattices

Softening of the phase transition and critical phenomena for the 2D random-bond Potts ferromagnet is investigated by using the density-of-states Monte Carlo method to calculate the thermodynamic properties with a variety of the quenched bond-randomness characterized by a disorder amplitude r=Ks/Kw. The numerical results show that the crossover from the 1st- to 2nd-order transition was induced at finite lattices for the self-dual bimodal distribution.

GLASSY BEHAVIOR OF YBa2Cu3O7

1988 ◽  
Vol 02 (11n12) ◽  
pp. 1327-1333 ◽  
Author(s):  
A. SAHLING ◽  
S. SAHLING
Keyword(s):  
Heat Capacity ◽  
Temperature Dependence ◽  
Density Of States ◽  
Equilibrium Temperature ◽  
Amorphous Solids ◽  
Acoustic Measurements ◽  
Rapid Cooling ◽  
Glassy Behavior ◽  
Long Time ◽  
Two Level Systems

Long time power released in YBa 2 Cu 3 O 7 after rapid cooling from equilibrium temperature T1 (2.35 K≤T≤15.11 K ) to T0=1.5 K and heat capacity (1.2 K ≤T≤100 K ) were measured. The observed time and temperature dependence of the power release is similar to those of amorphous solids. The resulting density of states of two-level systems is close to the values obtained from heat capacity and acoustic measurements.

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