Journal ArticleDOI
Origin of Magnetic Anisotropy Energy of Fe7S8 and Fe7Se8
K. Adachi,K. Sato +1 more
TLDR
Based on the electronic energy state of Fe2+ ion in the crystalline fields in Fe7S8 and Fe7Se8 (4c) with a pseudo NiAs structure, the expression of magnetic anisotropy energy were derived by perturbation method under an appropriate approximation.Abstract:
Based on the electronic energy state of Fe2+ ion in the crystalline fields in Fe7S8 and Fe7Se8 (4c) with a pseudo NiAs structure, the expression of magnetic anisotropy energy were derived by perturbation method under an appropriate approximation. Then the experimental results of magnetization curves were analyzed from this theory and the physical constants for the anisotropy energy, such as orbital angular momentum in the lowest state and the anisotropy energies of the second‐ and the fourth‐order, were estimated. Using these constants, the experimental results of the temperature dependence on the spin angle (the second‐order transformation) without magnetic field were well explained. On the other hand, a possibility of the occurrence of the first‐order phase transformation for spin angle appearing in Fe7Se8 (3c) and FeS (α‐point) was discussed from the same basis of the theory, and was given an explanation for the nuclear quadrupole shift at this transformation point in the Mossbauer experiment.read more
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Journal ArticleDOI
Magnetic Properties of Cobalt and Nickel Dichalcogenide Compounds with Pyrite Structure
TL;DR: The magnetic properties of dichalcogenide compounds, CoS 2, CoSe 2, NiS 2, NiSe 2 and the system Co(S x Se 1- x ) 2, were studied by means of magnetic measurement, neutron diffraction and NMR as discussed by the authors.
Journal ArticleDOI
Magnetic susceptibility of single-crystal Fe1−xS
TL;DR: In this paper, the magnetic susceptibilities of very nearly stoichiometric FeS have been obtained, in the temperature range 80 to 600°K, on single crystals of several compositions of Fe1−xS for 0 ⩽ x⩽ 0.07.
Journal ArticleDOI
Electric anomalies at the phase transition in FeS
TL;DR: The conductivity and thermoelectric power of single crystals of Fe 0.996 S have been recorded at temperatures between 80° and 530°K as discussed by the authors, and it appears to be a p-type semiconductor with band-gap 0.04 eV at low temperatures and a not-well-behaved metal above the phase transition at T α ≅420°K.
Journal ArticleDOI
Neutron Diffraction Study of Fe 7 Se 8 . II
References
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Journal ArticleDOI
Electrical Conduction in Nickel Ferrous Ferrites
T. Kohane,B. D. Silverman +1 more
TL;DR: The radio emission from solar flares is of special interest in the study of geomagnetic storms and solar cosmic rays because it gives a direct indication oi the passage of ionized streams of gas through the Sun's atmosphere as discussed by the authors.
Journal ArticleDOI
Magnetic anisotropy energy in nickel arsenide type crystals.
TL;DR: In this article, the magnetic anisotropy energy of magnetic compounds with a nickel arsenide type crystal structure was studied, assuming the ionic constitution of transition metal elements, from the stand point of one ion approximation.
Journal ArticleDOI
The Magnetic Properties of Iron Selenide Single Crystals
TL;DR: In this paper, large single crystals of Fe 7 Se 8 and Fe 3 Se 4 were prepared, and their magnetic properties below the Curie point were investigated by a torque magneto meter.
Journal ArticleDOI
Mössbauer Study of Hyperfine Field, Quadrupole Interaction, and Isomer Shift of Fe 57 in FeS 1.00 , FeS 1.05 and FeS 1.07
TL;DR: In this paper, the hyperfine structures of Fe 57 in FeS 1.00, FeS1.05 and FeS 2.07 have been investigated by the method of the Mossbauer absorption.
Journal Article
Excess negative charge of electron-photon shower and the coherent radiation originating from it. radiorecording of showers under the ground and on the moon
TL;DR: In this article, the Cerenkov radiation from electron-photon showers connected with positron annihilation in flight and with the contribution of compton and delta electrons in the cascade is considered.