scholarly journals Спонтанный спиновый магнетизм донорных электронов проводимости гибридизированных состояний кристалла, образованных системой примесных атомов 3d-элементов низкой концентрации (<1 at.%)

2022 ◽  
Vol 64 (1) ◽  
pp. 60
Author(s):  
Т.Е. Говоркова ◽  
В.И. Окулов
Keyword(s):  
Spin Polarization ◽  
Transition Element ◽  
Electron System ◽  
Experimental Proof ◽  
Theoretical Concepts ◽  
Conduction Electrons ◽  
Impurity Atoms ◽  
Mercury Selenide ◽  
The Given ◽  
The Magnetic Field

The given work is devoted to the experimental proof of existing the spontaneous spin polarization of the donor electron system of 3d-transition element impurity atoms of low concentration (<1 at.%) in a mercury selenide crystal. For this purpose there have been measured the dependences of the magnetization on the magnetic field strength. As a result of the analysis of the obtained dependences, there were extracted the impurity contributions, which are described by the magnetization curves typical of the ferromagnets, and by the magnetic parameters conforming to the spontaneous magnetism of the systems under study, which are unambiguously related to the donor conduction electrons of the outer d-shells of impurity atoms. By its nature, according to the developed theoretical concepts, the spontaneous spin polarization manifests itself in exchange interaction, taking place in hybridizing the electronic states of the impurity atom and the conduction band ones of the crystal.

Anomalous Galvanomagnetic Effects due to Spontaneous Spin Polarization of Electrons in Crystal with Low Concentration of 3d-Transition Element Impurities

2015 ◽  
Vol 233-234 ◽  
pp. 456-459 ◽  
Author(s):  
A.T. Lonchakov ◽  
Vsevolod I. Okulov ◽  
E.A. Pamyatnykh ◽  
T.E. Govorkova ◽  
M.A. Andriichuk ◽  
...  
Keyword(s):  
Hall Effect ◽  
Spin Polarization ◽  
Room Temperature ◽  
Transition Element ◽  
Anomalous Hall Effect ◽  
Theoretical Interpretation ◽  
Electron Systems ◽  
Relative Contribution ◽  
Galvanomagnetic Effects ◽  
The Magnetic Field

The results of experimental observations at room temperature of anomalous Hall effect associated with existence of a spontaneous spin polarization of conduction electrons in mercury selenide crystals doped with chromium and vanadium in the concentration range from 1·1018 to 1·1019 sm-3 are reported. Comparison of the experimental data together with the previously reported results related to crystals with iron, cobalt and nickel impurities shows that the relative contribution to the anomalous Hall effect is maximal for vanadium impurity (≈ 13%) and minimal for iron impurity (≈ 5%). Also, transverse magnetoresistance with a characteristic dependence on the magnetic field strength, on which an unusual hysteresis in the field dependence was observed, was found in investigated crystals at room temperature. Theoretical interpretation of the observed effects is developed based on the concepts of thermodynamic nature of anomalous galvanomagnetic phenomena in electron systems with spontaneous spin polarization.

New data and developments pertaining to ideas about the electron system of hybridized states of cobalt impurity atoms in a mercury selenide crystal

2017 ◽  
Vol 43 (4) ◽  
pp. 508-514 ◽  
Author(s):  
T. E. Govorkova ◽  
I. V. Zhevstovskikh ◽  
A. T. Lonchakov ◽  
V. I. Okulov ◽  
K. A. Okulova ◽  
...  
Keyword(s):  
Electron System ◽  
Impurity Atoms ◽  
Mercury Selenide

Experimental study of manifestations of resonance scattering of conduction electrons on transition-element impurities in mercury selenide

2005 ◽  
Vol 31 (10) ◽  
pp. 872-879 ◽  
Author(s):  
V. I. Okulov ◽  
A. V. Gergert ◽  
T. E. Govorkova ◽  
A. V. Korolyov ◽  
A. T. Lonchakov ◽  
...  
Keyword(s):  
Experimental Study ◽  
Transition Element ◽  
Resonance Scattering ◽  
Conduction Electrons ◽  
Mercury Selenide

Формирование изображений электрических сигналов преобразователя магнитного поля при гистерезисной интерференции для контроля металлов в импульсных магнитных полях

2020 ◽  
pp. 38-45
Author(s):  
В.В. Павлюченко ◽  
Е.С. Дорошевич
Keyword(s):  
Magnetic Field ◽  
Aluminum Plate ◽  
Thickness Variation ◽  
Magnetic Carrier ◽  
Electric Voltage ◽  
Total Strength ◽  
Magnetic Field Transducer ◽  
The Given ◽  
The Magnetic Field

Based on the developed methods of hysteresis interference, the calculated dependences U(x) of the electric voltage taken from the magnetic field transducer on the x coordinate were obtained. A magnetic carrier with an arctangent characteristic was exposed to a series of bipolar pulses of the magnetic field of a linear inductor of one, two, three, four, five and fifteen pulses. An algorithm is presented for the sequence of changes in the magnitude of the total strength of the magnetic field pulses on the surface of an aluminum plate, which provides the same amplitude of hysteresis oscillations of the electric voltage and makes it possible to obtain a linear difference dependence U(x) for wedge-shaped and flat aluminum samples. The results obtained make it possible to increase the accuracy and efficiency of control of the thickness of the object and its thickness variation in the given directions, as well as the defects of the object.

Neutron inelastic-scattering experiments on semimetallic actinide compounds

1995 ◽  
Vol 73 (11-12) ◽  
pp. 718-725 ◽  
Author(s):  
G. H. Lander ◽  
W. G. Stirling ◽  
B. R. Cooper
Keyword(s):  
Crystal Structure ◽  
Magnetic Material ◽  
Inelastic Scattering ◽  
National Laboratory ◽  
Theoretical Concepts ◽  
Neutron Inelastic Scattering ◽  
Conduction Electrons ◽  
Dynamical Properties

This paper traces the development of the study of the dynamical properties of the semimetallic actinide compounds that have a NaCl crystal structure (monopnictides and monochalcogenides) from the first experiment with a triple-axis spectrometer at Chalk River National Laboratory in 1976. The important realization that the excitations could be overdamped even in an ordered magnetic material, such as UN, because of the interaction between the 5f and conduction electrons remains one of the unique aspects of the physics of these materials. Later experiments on UTe and the transuranium material PuSb are discussed, together with the theoretical concepts that have allowed these results to be understood in terms of the hybridization between the 5f and conduction electrons.

scholarly journals Spin Polarization Oscillations and Coherence Time in the Random Interaction Approach

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
P. Pereyra
Keyword(s):  
Magnetic Field ◽  
Time Evolution ◽  
Spin Polarization ◽  
Energy Levels ◽  
Coherence Time ◽  
Environment Interaction ◽  
Interaction Picture ◽  
Gaussian Orthogonal Ensemble ◽  
Interaction Approach ◽  
The Magnetic Field

We study the time evolution of the survival probability and the spin polarization of a dissipative nondegenerate two-level system in the presence of a magnetic field in the Faraday configuration. We apply the Extended Gaussian Orthogonal Ensemble approach to model the stochastic system-environment interaction and calculate the survival and spin polarization to first and second order of the interaction picture. We present also the time evolution of the thermal average of these quantities as functions of the temperature, the magnetic field, and the energy-levels density, for ρ(ϵ)∝ϵs, in the subohmic, ohmic, and superohmic dissipation forms. We show that the behavior of the spin polarization calculated here agrees rather well with the time evolution of spin polarization observed and calculated, recently, for the electron-nucleus dynamics of Ga centers in dilute (Ga,N)As semiconductors.

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