scholarly journals Determination of the properties of vector mesons in external magnetic field by quenched SU(3) lattice QCD

2017 ◽  
Vol 2017 (9) ◽  
Author(s):  
E.V. Luschevskaya ◽  
O.E. Solovjeva ◽  
O.V. Teryaev
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Lattice Qcd ◽  
Vector Mesons

scholarly journals Magnetic structure of vector mesons in lattice QCD

2018 ◽  
Vol 182 ◽  
pp. 02077
Author(s):  
E.V. Luschevskaya ◽  
O.E. Solovjeva ◽  
O.V. Teryaev ◽  
M.S. Prokudin
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Lattice Qcd ◽  
Magnetic Structure ◽  
Significant Contribution ◽  
Spin Projection ◽  
Vector Mesons ◽  
G Factor ◽  
Magnetic Polarizability ◽  
The Magnetic Field

We have explored the response of the charged vector mesons on the external magnetic field. The g-factor of the charged vector ρ and K* mesons has been found. For the charged vector ρ meson the magnetic polarizability and hyperpolarizability have been calculated depending on the spin projection on the the magnetic field. We have estimated the intervals of the magnetic field for which the nonlinear terms in field give a significant contribution to the meson energy.

scholarly journals A model of the response of GMR of metallic multilayers to external magnetic field

2015 ◽  
Vol 33 (4) ◽  
pp. 835-840
Author(s):  
J.I. Uba ◽  
A.J. Ekpunobi ◽  
P.I. Ekwo
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Giant Magnetoresistance ◽  
Ion Beam ◽  
Interface Roughness ◽  
Total Density ◽  
Metallic Multilayers ◽  
Interface Quality ◽  
Qualitative Measure

AbstractIt has not been possible to transform resistivity models in terms of magnetic field in order to account for variation of giant magnetoresistance (GMR) with external magnetic field, which would have led to determination of material properties. This problem is approached mathematically via variation calculus to arrive at an exponential function that fits observed GMR values. Using this model in free electron approximation, the mean Fermi vector, susceptibility and total density of states of a number of metallic multilayers are determined from their reported GMR values. Susceptibility is found to depend on interface roughness and antiferromagnetic (AF) coupling; thus, it gives qualitative measure of interface quality and AF coupling. Comparison of susceptibilities and GMRs of electrodeposited and ion beam sputtered Co/Cu structures shows that a rough interface suppresses GMR in the former but enhances it in the latter.

Whistler emission through transition radiation by a modulated electron beam spiralling in a magnetoplasma

2000 ◽  
Vol 63 (3) ◽  
pp. 285-295 ◽  
Author(s):  
M. STARODUBTSEV ◽  
C. KRAFFT
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
External Magnetic Field ◽  
Transition Radiation ◽  
Physical Processes ◽  
Phase Velocities ◽  
Electric Dipoles ◽  
Wave Emission ◽  
Loop Antennas

Transition radiation from the zone of injection of a modulated electron beam spiralling into a magnetoplasma has been identified as whistler waves propagating quasiparallel to the external magnetic field. The characteristics of the radiation are similar to the emission by localized sources, such as loop antennas and electric dipoles: resonance-cone structures at low plasma densities and energy flow along the external magnetic field at higher densities, with a diverging radiation pattern and with whistler phase velocities inversely proportional to the plasma frequency. These studies should contribute to a wider understanding of the physical processes connected with the injection of charges in a magnetoplasma – either from a gun on board a spacecraft or in a plasma chamber – and thus allow the determination of appropriate radiator characteristics in order to control, to some extent, plasma perturbations and wave emission in the region of the injector.

Numerical investigation of influence of ionic space charge and flexoelectric polarization on measurements of elastic constants in nematic liquid crystals

2009 ◽  
Vol 17 (2) ◽  
Author(s):  
M. Buczkowska ◽  
G. Derfel ◽  
M. Konowalski
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
External Magnetic Field ◽  
Space Charge ◽  
Elastic Constants ◽  
High Concentration ◽  
Light Passing ◽  
The Magnetic Field

AbstractDeformations of nematic layers caused by magnetic field allow determination of the elastic constants of liquid crystal. In this paper, we simulated numerically the deformations of planar and homeotropic nematic layers. The flexoelectric properties of the nematic and presence of ions were taken into account. Our aim was to show the influence of flexoelectricity on the results of the real measurement of the elastic constants k33 and k11. In these simulations, we calculated the optical phase difference ΔΦ between the ordinary and extraordinary rays of light passing through the layer placed between crossed polarizers as a function of the magnetic field induction B. One of the elastic constants can be calculated from the magnetic field threshold for deformation. The ratio k33/k11 can be found by means of fitting theoretical ΔΦ(B) dependence to the experimental results. The calculations reveal that the flexoelectric properties influence the deformations induced by the external magnetic field. In the case of highly pure samples, this may lead to false results of measurement of the elastic constants ratio k33/k11. This influence can be reduced if the nematic material contains ions of sufficiently high concentration. These results show that the flexoelectric properties may play an important role, especially in well purified samples.

Determination of Texture Degree of NdFeB-Magnets by Means of Neutron Diffraction

2010 ◽  
Vol 168-169 ◽  
pp. 161-164 ◽  
Author(s):  
A.E. Teplykh ◽  
S.G. Bogdanov ◽  
Yong Choi ◽  
Nikolai V. Kudrevatykh ◽  
A.N. Pirogov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Neutron Diffraction ◽  
Quantitative Determination ◽  
Permanent Magnets ◽  
Reflection And Transmission ◽  
Ndfeb Magnets ◽  
Texture Degree

Six samples of Nd-Fe-B-permanent magnets, distinguished in the texture degree, have been measured by neutron diffraction in the reflection and transmission regimes. The texture in the samples was formed by application of impulses of external magnetic field 0H = 4 T. Analysis of the obtained neutron diagrams by means of the Fullprof program allowed quantitative determination of the texture degree and conclusion to be made that the texture degree grows with an increase in numbers of magnetic field impulses.

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