WEAK FERROMAGNETIC FLUCTUATIONS IN GdSr2RuCu2O8 COMPOUND

2003 ◽  
Vol 17 (04n06) ◽  
pp. 602-607
Author(s):  
M. R. CIMBERLE ◽  
M. CUOCO ◽  
C. NOCE ◽  
A. VECCHIONE ◽  
M. GOMBOS ◽  
...  
Keyword(s):  
Critical Exponent ◽  
Mode Coupling ◽  
Magnetic Response ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Magnetic Instability ◽  
Spin Mode ◽  
Cuprate Oxide ◽  
Weak Ferromagnetic

It has been investigated the static magnetic response of the polycrystalline rutheno-cuprate oxide GdSr 2 RuCu 2 O 8. The susceptibility χ shows an upturn at T C ~ 134 K which indicates the onset of a magnetic instability. Above that transition we have analyzed within a spin mode coupling theory the dependence of χ-1 in the form of ~ (T - TC)γ. The main finding is that the value of the critical exponent γ can be understood as mainly due ferromagnetic fluctuations, assuming that the system is close to its quantum paramagnetic instability and that the magnetization comes primarily from itinerant moments, rather than moments localized to the atomic sites.

scholarly journals Hard discs under steady shear: comparison of Brownian dynamics simulations and mode coupling theory

2009 ◽  
Vol 367 (1909) ◽  
pp. 5033-5050 ◽  
Author(s):  
Oliver Henrich ◽  
Fabian Weysser ◽  
Michael E. Cates ◽  
Matthias Fuchs
Keyword(s):  
Brownian Dynamics ◽  
Mode Coupling ◽  
Transition Density ◽  
Two Dimensions ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Stationary Structure ◽  
Homogeneous Shear Flow ◽  
Dynamics Simulations ◽  
Brownian Dynamics Simulations

Brownian dynamics simulations of bidisperse hard discs moving in two dimensions in a given steady and homogeneous shear flow are presented close to and above the glass transition density. The stationary structure functions and stresses of shear-melted glass are compared quantitatively to parameter-free numerical calculations of monodisperse hard discs using mode coupling theory within the integration through transients framework. Theory qualitatively explains the properties of the yielding glass but quantitatively overestimates the shear-driven stresses and structural anisotropies.

Application of mode-coupling theory to solvation dynamics

1996 ◽  
Vol 54 (3) ◽  
pp. 2786-2796 ◽  
Author(s):  
Jangseok Ma ◽  
David Vanden Bout ◽  
Mark Berg
Keyword(s):  
Mode Coupling ◽  
Solvation Dynamics ◽  
Coupling Theory ◽  
Mode Coupling Theory

scholarly journals Mode-coupling analysis of residual stresses in colloidal glasses

Soft Matter ◽  
2014 ◽  
Vol 10 (27) ◽  
pp. 4822-4832 ◽  
Author(s):  
S. Fritschi ◽  
M. Fuchs ◽  
Th. Voigtmann
Keyword(s):  
Glass Transition ◽  
Shear Flow ◽  
Residual Stresses ◽  
Mode Coupling ◽  
Nonlinear Response ◽  
Density Fluctuations ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Coupling Analysis ◽  
Soft Glasses

Soft glasses produced after the cessation of shear flow exhibit persistent residual stresses. Mode coupling theory of the glass transition explains their history dependence in terms of nonequilibrium, nonlinear-response relaxation of density fluctuations.

scholarly journals Critical Slowing Down Exponents of Mode Coupling Theory

2012 ◽  
Vol 108 (8) ◽  
Author(s):  
F. Caltagirone ◽  
U. Ferrari ◽  
L. Leuzzi ◽  
G. Parisi ◽  
F. Ricci-Tersenghi ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Critical Slowing Down ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Slowing Down

scholarly journals Nonequilibrium mode-coupling theory for dense active systems of self-propelled particles

Soft Matter ◽  
2017 ◽  
Vol 13 (41) ◽  
pp. 7609-7616 ◽  
Author(s):  
Saroj Kumar Nandi ◽  
Nir S. Gov
Keyword(s):  
Liquid State ◽  
Mode Coupling ◽  
Statistical Physics ◽  
Active Particle ◽  
Scaling Relations ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Current Interest ◽  
Active Systems ◽  
Dense Liquid

The physics of active systems of self-propelled particles, in the regime of a dense liquid state, is an open puzzle of great current interest, both for statistical physics and because such systems appear in many biological contexts. We obtain a nonequilibrium mode-coupling theory for such systems and present analytical scaling relations through mapping with a simpler model of a single trapped active particle.

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