Transverse Zeeman effect for ions in uniaxial crystals

1976 ◽  
Vol 352 (1668) ◽  
pp. 91-108 ◽  
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
External Magnetic Field ◽  
Optical Spectrum ◽  
Zeeman Effect ◽  
Approximate Symmetry ◽  
Crystal Axis ◽  
Large Intensity ◽  
Intensity Changes ◽  
Point Groups

The theory of the Zeeman effect for ions in crystals at sites of uniaxial symmetry has been developed for intra-configuration transitions with the external magnetic field H perpendicular to the crystal axis c . Variations in the axial optical spectrum that occur when the crystal is rotated about c are described in terms of the types A and B of the upper and lower states involved in the transition. Large intensity changes can occur for ions at sites of D 4 , C 4v or D 2d symmetry for those transitions that appear only in the σ spectrum. Analogous variations can only take place for D 6 , C 6v and D 3h in those cases where H is sufficiently large to mix neighbouring crystal-field states. Other uniaxial point groups are considered as cases of approximate symmetry. The theory is developed with particular reference to U 5+ in zircon, to CoCs 3 Cl 5 , and to the rare-earth ethylsulphates.

Optimization of Semimagnetic Semiconductor-Based Nanostructures for Spintronic Applications

2006 ◽  
Vol 518 ◽  
pp. 35-40
Author(s):  
J. Radovanović ◽  
V. Milanović ◽  
Z. Ikonić ◽  
D. Indjin
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Simulated Annealing Algorithm ◽  
Structural Parameters ◽  
Zeeman Effect ◽  
Parameters Optimization ◽  
Potential Barriers ◽  
Annealing Algorithm ◽  
Electrical Bias ◽  
Spin Filtering

We have analyzed the spin-filtering effects of the electron current in asymmetric ZnSe/Zn1-xMnxSe multilayer structures, under the influence of both an external magnetic field and a bias voltage. In this type of semiconductor systems, conduction band electrons interact with 3d electrons of the magnetic Mn2+ ions. Because of this sp-d exchange interaction, an external magnetic field modulates the effective potential profile seen by spin-up and spin-down electrons, giving rise to a large Zeeman effect. It is found that the degree of spin polarization changes significantly when the electrical bias is switched from forward to reverse, thus the proposed structure displays obvious behavior of spin-filter diode. This originates from the effective “lifting” of the potential for spin-up electrons, which tunnel through actual potential barriers. Structural parameters optimization, with the goal of maximizing the spin-filtering coefficient, was performed by using simulated annealing algorithm. The described effect may be important for designing new tunable spin-based multifunctional semiconductor devices.

Magnetic alignment in 2212 Bi-based superconducting system: Part I. Magnetic orientation of Bi2Sr2Ca1−x(RE)xCu2O8−y [(RE) = Gd, Dy, Ho, Er] powder dispersed in epoxy resin at room temperature

1996 ◽  
Vol 11 (5) ◽  
pp. 1082-1085 ◽  
Author(s):  
S. Stassen ◽  
R. Cloots ◽  
Ph. Vanderbemden ◽  
P. A. Godelaine ◽  
H. Bougrine ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
External Magnetic Field ◽  
Magnetic Anisotropy ◽  
Epoxy Resin ◽  
Room Temperature ◽  
Magnetic Alignment ◽  
Magnetic Orientation ◽  
System Part ◽  
The Rare Earth

The magnetic anisotropy of rare-earth substituted 2212 materials (Bi2Sr2Ca0.8RE0.2Cu2Ox with RE = Gd, Dy, Ho, Er) is put into evidence. Superconducting powder dispersed in epoxy resin is oriented under an external magnetic field (4 T) in a direction that depends on the nature of the rare-earth used in the substitution. Both directions of observation (parallel or perpendicular to the field) were investigated. Splitting of (00l) peaks is neatly observed and discussed.

Neutron diffraction studies of rare earth compound Nd7Ni3 in an external magnetic field

1999 ◽  
Vol 60 (8-9) ◽  
pp. 1209-1212 ◽  
Author(s):  
X Xu ◽  
S Kawano ◽  
T Tsutaoka ◽  
Y Andoh ◽  
M Kurisu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
External Magnetic Field ◽  
Neutron Diffraction ◽  
Rare Earth Compound

scholarly journals Наблюдение когерентного пленения населенности в ансамблях NV-центров в алмазе в условиях антипересечения уровней основного состояния

2019 ◽  
Vol 127 (8) ◽  
pp. 260
Author(s):  
Р.А. Ахмеджанов ◽  
И.В. Зеленский ◽  
Л.А. Гущин ◽  
В.А. Низов ◽  
Н.А. Низов ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Ground State ◽  
State Level ◽  
Coherent Population Trapping ◽  
Crystal Axis ◽  
Trapping Effect ◽  
Population Trapping ◽  
Ground State Level ◽  
Nv Centers

We realize the coherent population trapping effect in ensembles of diamond NV-centers in the ground state level anticrossing regime when the sample is placed into a strong external magnetic field along the [111] crystal axis.

scholarly journals Effect of external magnetic field on the co-existence of superconductivity and antiferromagnetism in rare earth nickel borocarbides (RNi2B2C)

2016 ◽  
Vol 30 (08) ◽  
pp. 1650044
Author(s):  
Salila Das ◽  
Prakash Chandra Padhi
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
External Magnetic Field ◽  
Energy Gap ◽  
Density Wave ◽  
Spin Density Wave ◽  
Mean Field ◽  
Antiferromagnetic Order ◽  
Superconducting Energy Gap ◽  
Nickel Borocarbides

In this paper, we have studied the effect of external magnetic field in the co-existing phase of superconducting and antiferromagnetism (AFM) of rare earth nickel borocarbides. The AFM in these systems might have originated due to both localized “f” electrons as well as itinerant electrons which are responsible for conduction. On the other hand, superconductivity (SC) is due to spin density wave, arising out of Fermi surface instability. The AFM order is mostly influenced by hybridization of the “f” electron with the conduction electron. Here, we have obtained the dependence of superconducting energy gap as well as staggered magnetic field on temperature T and energy [Formula: see text] in a framework based on mean field Hamiltonian using double time electron Green’s function. We have shown in our calculation the effect of external magnetic field on superconducting and antiferromagnetic order parameters for [Formula: see text] in the presence of hybridization. The ratio of the calculated effective gap and [Formula: see text] is close to BCS value which agrees quite well with experimental results.

scholarly journals Zeeman Effect in Phase Space

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
R. A. S. Paiva ◽  
R. G. G. Amorim ◽  
S. C. Ulhoa ◽  
A. E. Santana ◽  
F. C. Khanna
Keyword(s):  
Magnetic Field ◽  
Perturbation Theory ◽  
Phase Space ◽  
External Magnetic Field ◽  
Hydrogen Atom ◽  
Schrödinger Equation ◽  
Harmonic Oscillator ◽  
Schrodinger Equation ◽  
Zeeman Effect ◽  
Two Dimensional

The two-dimensional hydrogen atom in an external magnetic field is considered in the context of phase space. Using the solution of the Schrödinger equation in phase space, the Wigner function related to the Zeeman effect is calculated. For this purpose, the Bohlin mapping is used to transform the Coulomb potential into a harmonic oscillator problem. Then, it is possible to solve the Schrödinger equation easier by using the perturbation theory. The negativity parameter for this system is realised.

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