scholarly journals Critical Behavior in Tricritical Phase Transition. I: Critical Exponents ( ,  ,  ,  ,  )

1977 ◽  
Vol 58 (2) ◽  
pp. 516-525 ◽  
Author(s):  
Y. Yamazaki ◽  
M. Suzuki
Keyword(s):  
Phase Transition ◽  
Critical Behavior ◽  
Critical Exponents

CRITICAL BEHAVIOR IN THE MODEL OF RANDOM SURFACES WITH DYNAMICAL HOLES EMBEDDED IN −2- AND 1-DIMENSIONAL SPACES

1991 ◽  
Vol 06 (01) ◽  
pp. 79-87 ◽  
Author(s):  
D.V. BOULATOV
Keyword(s):  
Phase Transition ◽  
Critical Behavior ◽  
Critical Exponents ◽  
Random Surfaces ◽  
Scalar Particles ◽  
Exactly Solvable ◽  
The Mean

The model of discretized random surfaces with dynamical holes recently proposed by V.A. Kazakov for D=0 is considered for nontrivial embeddings, the cases D=−2 and 1 being exactly solvable. The model has two new parameters: the fugacity for the number of the holes ξ and a mass of scalar particles moving along their borders m. At m=mc the mean length of the borders and the mean number of the holes undergo the phase transition — related to an explosion of the holes — becoming singular at ξ=0. The singularity still exists for m<mc where the phase of “completely torn” surfaces takes place. The correspondent critical exponents are calculated.

scholarly journals Phase transition, critical behavior, and critical exponents of Myers-Perry black holes

2013 ◽  
Vol 88 (2) ◽  
Author(s):  
Mohammad Bagher Jahani Poshteh ◽  
Behrouz Mirza ◽  
Zeinab Sherkatghanad
Keyword(s):  
Phase Transition ◽  
Black Holes ◽  
Critical Behavior ◽  
Critical Exponents

scholarly journals Structure, Magnetocaloric Effect and Critical Behavior of the Fe60Co12Gd4Mo3B21 Amorphous Ribbons

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 34
Author(s):  
Agnieszka Łukiewska ◽  
Piotr Gębara
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Critical Behavior ◽  
Critical Exponents ◽  
Amorphous Structure ◽  
X Ray ◽  
Amorphous Ribbons ◽  
Spectroscopy Studies ◽  
Arrott Plots ◽  
Second Order Phase Transition

The aim of the paper was to study the structure, magnetic properties and critical behavior of the Fe60Co12Gd4Mo3B21 alloy. The X-ray diffractometry and the Mössbauer spectroscopy studies confirmed amorphous structure. The analysis of temperature evolution of the exponent n (ΔSM = C·(Bmax)n) and the Arrott plots showed the second order phase transition in investigated material. The analysis of critical behavior was carried out in order to reveal the critical exponents and precise TC value. The ascertained critical exponents were used to determine the theoretical value of the exponent n, which corresponded well with experimental results.

scholarly journals Determination of Phase Transition and Critical Behavior of the As-Cast GdGeSi-(X) Type Alloys (Where X = Ni, Nd and Pr)

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 185
Author(s):  
Piotr Gębara ◽  
Mariusz Hasiak
Keyword(s):  
Phase Transition ◽  
Order Phase Transition ◽  
Critical Behavior ◽  
Critical Exponents ◽  
Second Order ◽  
Experimental Result ◽  
First Order Phase Transition ◽  
First Order Phase ◽  
Second Order Phase Transition

The aim of the paper is to present a study of the magnetocaloric effect and the nature of phase transition in the Gd80Ge15Si5 (S1), Gd75Ge15Si5Ni5 (S2), Gd75Ge15Si5Pr5 (S3) and Gd75Ge15Si5Nd5 (S4) alloys. The magnetic entropy changes determined for studied samples, under external magnetic field ~3T, were 11.91, 12.11, 5.08 and 4.71 J/(kg K) for S1, S2, S3 and S4, respectively. The values of refrigerant capacity (under ~3T) were 164, 140, 160 and 140 J/kg for S1, S2, S3 and S4, respectively. The first order phase transition was detected for samples S1 and S2, while specimens S3 and S4 manifested the second order phase transition at the Curie point (TC). The analysis of temperature evolution of the exponent n (ΔSM = C·(Bmax)n) showed the validity of this method in detecting either the first or the second order phase transition and the structural transition. The analysis of critical behavior was carried out for samples S3 and S4. The critical exponents and precise TC values were calculated. The ascertained critical exponents were used to determine the theoretical value of the exponent n, which corresponded well with experimental result.

scholarly journals Study of physical properties of a ferrimagnetic spinel Cu1.5Mn1.5O4: spin dynamics, magnetocaloric effect and critical behavior

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25664-25676
Author(s):  
Abir Hadded ◽  
Jalel Massoudi ◽  
Sirine Gharbi ◽  
Essebti Dhahri ◽  
A. Tozri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Physical Properties ◽  
Magnetocaloric Effect ◽  
Phase Transition Temperature ◽  
Magnetic Phase Transition ◽  
Critical Behavior ◽  
Magnetic Phase ◽  
Spin Dynamics ◽  
Critical Behaviour

The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4.

scholarly journals Magnetic-field induced quantum phase transition and critical behavior in a gapped spin system

2007 ◽  
Vol 310 (2) ◽  
pp. 1352-1354 ◽  
Author(s):  
F. Yamada ◽  
T. Ono ◽  
M. Fujisawa ◽  
H. Tanaka ◽  
T. Sakakibara
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Phase Transition ◽  
Spin System ◽  
Critical Behavior ◽  
Quantum Phase

Non-Equilibrium Critical Relaxation of Heisenberg Ferromagnets with Long-Range Correlated Defects

2012 ◽  
Vol 190 ◽  
pp. 39-42
Author(s):  
M. Medvedeva ◽  
Pavel V. Prudnikov
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Critical Behavior ◽  
Critical Exponents ◽  
Heisenberg Model ◽  
Three Dimensional ◽  
Initial State ◽  
Short Time ◽  
Theoretic Description ◽  
Good Agreement

The dynamic critical behavior of the three-dimensional Heisenberg model with longrangecorrelated disorder was studied by using short-time Monte Carlo simulations at criticality.The static and dynamic critical exponents are determined. The simulation was performed fromordered initial state. The obtained values of the exponents are in a good agreement with resultsof the field-theoretic description of the critical behavior of this model in the two-loopapproximation.

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