scholarly journals Zero- and finite-temperature mean field study of magnetic field induced electric polarization in Ba2CoGe2O7: Effect of the antiferroelectric coupling

2011 ◽  
Vol 84 (22) ◽  
Author(s):  
Judit Romhányi ◽  
Miklós Lajkó ◽  
Karlo Penc
Keyword(s):  
Magnetic Field ◽  
Field Study ◽  
Finite Temperature ◽  
Mean Field ◽  
Electric Polarization

Magnetic field and EoS of neutron star matter at finite temperature

2015 ◽  
Vol 24 (07) ◽  
pp. 1550051
Author(s):  
Qingwu Wang ◽  
Xiaofu Lü
Keyword(s):  
Magnetic Field ◽  
Neutron Star ◽  
Finite Temperature ◽  
Mean Field Theory ◽  
Mean Field ◽  
Mass Term ◽  
Baryon Density ◽  
Neutron Star Matter ◽  
Relativistic Mean Field ◽  
Inflection Points

In this paper, magnetic field and equation of state (EoS) of neutron star matter are studied under relativistic mean field theory. A nonzero mass term of magnetic field in the Lagrangian is introduced, which depends on baryon density of charged particles. The magnetic field has not been treated as external as usual and the calculations of magnetic field strength at finite temperature reveal the existence of inflection points in certain densities.

scholarly journals A beyond mean-field study of the Tavis-Cummings model

2019 ◽  
Author(s):  
C. Tejera-Centeno ◽  
P. Pérez-Fernández ◽  
J. M. Arias
Keyword(s):  
Field Study ◽  
Mean Field

scholarly journals On the dynamical interaction between overshooting convection and an underlying dipole magnetic field – I. The non-dynamo regime

2021 ◽  
Vol 503 (1) ◽  
pp. 362-375
Author(s):  
L Korre ◽  
NH Brummell ◽  
P Garaud ◽  
C Guervilly
Keyword(s):  
Magnetic Field ◽  
Turbulent Diffusion ◽  
Large Scale ◽  
Molecular Diffusion ◽  
Mean Field ◽  
Stable Region ◽  
Turbulent Regime ◽  
Poloidal Magnetic Field ◽  
Dynamical Interaction ◽  
Large Scale Field

ABSTRACT Motivated by the dynamics in the deep interiors of many stars, we study the interaction between overshooting convection and the large-scale poloidal fields residing in radiative zones. We have run a suite of 3D Boussinesq numerical calculations in a spherical shell that consists of a convection zone with an underlying stable region that initially compactly contains a dipole field. By varying the strength of the convective driving, we find that, in the less turbulent regime, convection acts as turbulent diffusion that removes the field faster than solely molecular diffusion would do. However, in the more turbulent regime, turbulent pumping becomes more efficient and partially counteracts turbulent diffusion, leading to a local accumulation of the field below the overshoot region. These simulations suggest that dipole fields might be confined in underlying stable regions by highly turbulent convective motions at stellar parameters. The confinement is of large-scale field in an average sense and we show that it is reasonably modelled by mean-field ideas. Our findings are particularly interesting for certain models of the Sun, which require a large-scale, poloidal magnetic field to be confined in the solar radiative zone in order to explain simultaneously the uniform rotation of the latter and the thinness of the solar tachocline.

scholarly journals Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

2019 ◽  
Vol 122 (12) ◽  
Author(s):  
D. Geffroy ◽  
J. Kaufmann ◽  
A. Hariki ◽  
P. Gunacker ◽  
A. Hausoel ◽  
...  
Keyword(s):  
Field Study ◽  
Mean Field ◽  
Collective Modes

Low temperature and high magnetic field study of UBe13, U0.97Th0.03Be13 and UBe12.94Cu0.06

1986 ◽  
Vol 64 (3) ◽  
pp. 299-304 ◽  
Author(s):  
H. M. Mayer ◽  
U. Rauchschwalbe ◽  
F. Steglich ◽  
G. R. Stewart ◽  
A. L. Giorgi
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Field Study ◽  
High Magnetic Field
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