Exchange Splitting of Electron Spins in Copper-Based Kondo Alloys

1972 ◽  
Vol 50 (17) ◽  
pp. 1999-2011 ◽  
Author(s):  
P. T. Coleridge ◽  
G. B. Scott ◽  
I. M. Templeton
Keyword(s):  
Bound States ◽  
Zeeman Splitting ◽  
Solute Concentration ◽  
Exchange Energy ◽  
Spin Splitting ◽  
Electron Spins ◽  
Conduction Electrons ◽  
Scattering Effects ◽  
Effective Exchange ◽  
Cr System

Modification of the Zeeman splitting of conduction-electron spins by an s–d exchange interaction has been studied in the de Haas – van Alphen effect at fields up to 50 kG and temperatures of order 1 K in very dilute copper-based alloys of Cr, Mn, Fe, and Co. In Cu(Cr) there is a linear relationship between an effective exchange energy and solute concentration, and the results indicate an antiferromagnetic interaction between conduction electrons and polarized impurity spins with very little Kondo screening. The effects of increasing field or decreasing temperature are consistent with a simple polarization of the impurity spins. The variation of the exchange energy from orbit to orbit is explained by the variation over the copper Fermi surface of the d-like part of the wave function. The occurrence of clean spin-splitting zeros in the Cu(Cr) system is believed to be a fortuitous result of a symmetrical positioning of the Friedel virtual bound states relative to the Fermi energy. In Cu(Mn) the exchange energy effects are similar to those in Cu(Cr) but involve also a differential scattering of the two spin components in the de Haas – van Alphen oscillations which results in spin-splitting minima rather than zeros. In Cu(Fe) and Cu(Co) differential scattering effects are also observed, but in Cu(Fe) the exchange energy is markedly reduced and in Cu(Co) it is almost completely eliminated by spin compensation of the impurity moment by conduction electrons.

scholarly journals Zeeman gyrotropic scatterers

2018 ◽  
Vol 8 ◽  
pp. 184798041880808 ◽  
Author(s):  
Constantinos Valagiannopoulos ◽  
S Ali Hassani Gangaraj ◽  
Francesco Monticone
Keyword(s):  
Zeeman Splitting ◽  
Core Shell ◽  
Anomalous Scattering ◽  
Important Class ◽  
Fano Resonances ◽  
The Past ◽  
Scattering Effects ◽  
Full Analysis ◽  
The Subject ◽  
Scattered Fields

Anomalous scattering effects (invisibility, superscattering, Fano resonances, etc) enabled by complex media and metamaterials have been the subject of intense efforts in the past couple of decades. In this article, we present a full analysis of the unusual and extreme scattering properties of an important class of complex scatterers, namely, gyrotropic cylindrical bodies, including both homogeneous and core–shell configurations. Our study unveils a number of interesting effects, including Zeeman splitting of plasmonic scattering resonances, tunable gyrotropy-induced rotation of dipolar radiation patterns as well as extreme Fano resonances and non-radiating eigenmodes (embedded eigenstates) of the gyrotropic scatterer. We believe that these theoretical findings may enable new opportunities to control and tailor scattered fields beyond what is achievable with isotropic reciprocal objects, being of large significance for different applications, from tunable directive nano-antennas to selective chiral sensors and scattering switches, as well as in the context of nonreciprocal and topological metamaterials.

scholarly journals Spin Splitting Spectroscopy of Heavy Quark and Antiquarks Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hesham Mansour ◽  
Ahmed Gamal ◽  
M. Abolmahassen
Keyword(s):  
Mass Spectra ◽  
Bound States ◽  
Good Accuracy ◽  
Theoretical Calculations ◽  
Spin Splitting ◽  
Energy Eigenvalues ◽  
Central Case ◽  
Nu Method ◽  
Better Than ◽  
Good Agreement

Phenomenological potentials describe the quarkonium systems like c c ¯ , b b , ¯   and   b ¯ c where they give a good accuracy for the mass spectra. In the present work, we extend one of our previous works in the central case by adding spin-dependent terms to allow for relativistic corrections. By using such terms, we get better accuracy than previous theoretical calculations. In the present work, the mass spectra of the bound states of heavy quarks   c c ¯ , b b ¯ , and 𝐵𝑐 mesons are studied within the framework of the nonrelativistic Schrödinger equation. First, we solve Schrödinger’s equation by Nikiforov-Uvarov (NU) method. The energy eigenvalues are presented using our new potential. The results obtained are in good agreement with the experimental data and are better than the previous theoretical estimates.

scholarly journals Особенности поведения ионов Mn-=SUP=-2+-=/SUP=- в 3D-дираковском полуметалле alpha-Cd-=SUB=-3-=/SUB=-As-=SUB=-2-=/SUB=- по данным ЭПР

2021 ◽  
Vol 63 (2) ◽  
pp. 199
Author(s):  
Ю.В. Горюнов ◽  
А.Н. Натепров
Keyword(s):  
Magnetic Field ◽  
Free Electron ◽  
Bound States ◽  
High Manganese ◽  
Contact Potential ◽  
Conduction Electrons ◽  
Europium Doping ◽  
Dirac Semimetal ◽  
Electromagnetic Measurements ◽  
The Magnetic Field

The behavior of the manganese impurity in the 3D Dirac semimetal Cd3As2 has been studied by EPR and electromagnetic measurements. It was found that, in contrast to doping with europium, doping with manganese, as well as with iron, does not lead to a change in the sign of the magnetoresistance, which is almost completely suppressed at high manganese concentrations. In this case, a change in the type of the influence of the magnetic field on the contact potential is manifested. The g-factors measured in EPR coincide with the g-factor of a free electron at all temperatures, which, taking into account the fluctuation behavior of the EPR linewidth and the reduced magnetic moment on Mn2 +, indicates the formation of short-lived bound states of the Mn2 + ion and conduction electrons - antiferromagnetic polarons.

The magneto-optical properties of Cd3As2 exposed to circularly polarized radiation: interband transitions

1987 ◽  
Vol 65 (3) ◽  
pp. 199-203 ◽  
Author(s):  
H. El Alaoui Lamrani ◽  
M. J. Aubin
Keyword(s):  
Valence Band ◽  
Heavy Hole ◽  
Transition Probabilities ◽  
Spin Splitting ◽  
Interband Transitions ◽  
Circularly Polarized ◽  
Conduction Electrons ◽  
Hole Band ◽  
Circularly Polarized Radiation ◽  
Polarized Radiation

The first measurements of the interband magnetotransmission of Cd3As2 using circularly polarized radiation are reported. The single crystals were mounted in the Faraday configuration at 10 K. An analysis of the experimental results on the basis of the Bodnar model shows that spin splitting of the conduction electrons has been observed. A further analysis of the model shows, however, that it predicts an unrealistic behavior of the valence-band Landau levels (this constitutes the first reported results concerning this band). Thus, it is not possible to fit the data to the model, but by assuming a flat heavy-hole band, a reasonable fit is obtained. A calculation of the transition probabilities also leads to consistent results. It is concluded that changes in the Bodnar model are necessary to describe the valence band correctly.

scholarly journals Out-of-equilibrium spin transport in mesoscopic superconductors

2018 ◽  
Vol 376 (2125) ◽  
pp. 20150342 ◽  
Author(s):  
C. H. L. Quay ◽  
M. Aprili
Keyword(s):  
Bound States ◽  
Degrees Of Freedom ◽  
Spin Transport ◽  
Energy Gap ◽  
Particle Density ◽  
Zeeman Splitting ◽  
Quasi Particle ◽  
Particle Spin ◽  
Superconducting Energy Gap ◽  
Mesoscopic Superconductors

The excitations in conventional superconductors, Bogoliubov quasi-particles, are spin- fermions but their charge is energy-dependent and, in fact, zero at the gap edge. Therefore, in superconductors (unlike normal metals) spin and charge degrees of freedom may be separated. In this article, we review spin injection into conventional superconductors and focus on recent experiments on mesoscopic superconductors. We show how quasi-particle spin transport and out-of-equilibrium spin-dependent superconductivity can be triggered using the Zeeman splitting of the quasi-particle density of states in thin-film superconductors with small spin-mixing scattering. Finally, we address the spin dynamics and the feedback of quasi-particle spin imbalances on the amplitude of the superconducting energy gap. This article is part of the theme issue ‘Andreev bound states’.

Zeeman splitting of conduction electrons in nickel-doped palladium

1976 ◽  
Vol 20 (11) ◽  
pp. 1085-1088 ◽  
Author(s):  
S.P. Hörnfeldt ◽  
M. Dronjak ◽  
L. Nordborg
Keyword(s):  
Zeeman Splitting ◽  
Conduction Electrons

Zeeman Splitting of Anomalous Shallow Bound States in ZnO

1972 ◽  
Vol 28 (25) ◽  
pp. 1637-1639 ◽  
Author(s):  
Kenneth J. Button ◽  
Daniel R. Cohn ◽  
Michael von Ortenbert ◽  
Benjamin Lax ◽  
E. Mollwo ◽  
...  
Keyword(s):  
Bound States ◽  
Zeeman Splitting
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