Experimental observation of spontaneous spin polarization of electrons in hybridized states of transition element impurities in semiconductors

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.

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Nuclear Spin Polarization by Optical Pumping of Nitrogen Impurities in Semiconductors

Materials Science Forum ◽

10.4028/www.scientific.net/msf.83-87.1141 ◽

1992 ◽

Vol 83-87 ◽

pp. 1141-1146 ◽

Cited By ~ 1

Author(s):

Kouichi Murakami ◽

Kazusato Hara ◽

Kohzoh Masuda

Keyword(s):

Spin Polarization ◽

Nuclear Spin ◽

Optical Pumping ◽

Nuclear Spin Polarization ◽

Impurities In Semiconductors

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

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.233-234.456 ◽

2015 ◽

Vol 233-234 ◽

pp. 456-459 ◽

Cited By ~ 9

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.

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Experimental Observation of Electron Spin Polarization in Reactions

Chemically Induced Magnetic Polarization ◽

10.1007/978-94-010-1265-2_6 ◽

1977 ◽

pp. 107-118

Author(s):

K. A. McLauchlan

Keyword(s):

Experimental Observation ◽

Spin Polarization ◽

Electron Spin ◽

Electron Spin Polarization

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Generation of 4H and 6H Structures During the Hexagonal-Rhombohedral Transformation in Dy2Co17

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100113810 ◽

1975 ◽

Vol 33 ◽

pp. 38-39

Author(s):

C. W. Allen ◽

D. L. Kuruzar

Keyword(s):

Elevated Temperatures ◽

Layer Structure ◽

Transition Element ◽

Temperature Structure ◽

Allotropic Transformation ◽

Layer Plane ◽

Planar Defects ◽

Topologically Close Packed ◽

Transformation Mechanisms ◽

Shear Transformation

The rare earth/transition element intermetallics R2T17 are essentially topologically close packed phases for which layer structure models have already been presented. Many of these compounds are known to undergo allotropic transformation of the type at elevated temperatures. It is not unexpected that shear transformation mechanisms are involved in view of the layering character of the structures. The transformations are evidently quite sluggish, illustrated in furnace cooled Dy2Co17 by the fact that only rarely has the low temperature rhombohedral form been seen. The more usual structures observed so far in furnace cooled alloys include 4H and 6H in Dy2Co17 (Figs. 1 and 2) . In any event it is quite clear that the general microstructure is very complicated as a consequence of the allotropy, illustrated in Fig. 3. Numerous planar defects in the layer plane orientation are evident as are non-layer plane defects inherited from a high temperature structure.

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