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Aspects of the magnetism of ferrous chloride; Aspects du magnetisme du chlorure ferreux

Abstract

This work is a critical review of the existing work on ferrous chloride and presents, as well, a number of new experimental results. First, a careful analysis of the level structure of ferrous ions in the crystalline field shows that the crystalline anisotropy is of the same order of magnitude as the exchange interactions, a feature which gives rise to some particular effects, such as an upward curvature of the magnetization curve at 0 K in a perpendicular magnetic field. Further, the very low temperature (T > 0.4 K) thermal variation of both the specific heat and magnetic susceptibility evidences a magnetic component in elementary excitations. This result suggests the presence of a large magneto-elastic coupling. Finally, an experimental study of the H-T phase diagram near T{sub N} and of the critical behaviour of the specific heat and parallel susceptibility was performed. (author) [French] Ce travail constitue une analyse critique des resultats obtenus a ce jour sur le chlorure ferreux et comporte en outre quelques resultats experimentaux nouveaux. Tout d'abord, une etude precise de la structure de niveaux de l'ion ferreux dans le champ cristallin montre que l'anisotropie cristalline est comparable aux interactions d'echange, ce qui produit quelques effets originaux  More>>
Authors:
Carrara, P [1] 
  1. Commissariat a l'Energie Atomique Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Mar 01, 1968
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-3535
Resource Relation:
Other Information: TH: These sciences; 60 refs; PBD: Mar 1968
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL STRUCTURE; IRON CHLORIDES; MAGNETIC SPECIFIC HEAT; MAGNETIC SUSCEPTIBILITY; NEEL TEMPERATURE; PARAMAGNETISM; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; ZEEMAN EFFECT
OSTI ID:
20523319
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Paris-11 Univ., Faculte des Sciences, 91 - Orsay (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3535091374
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[177] pages
Announcement Date:

Citation Formats

Carrara, P. Aspects of the magnetism of ferrous chloride; Aspects du magnetisme du chlorure ferreux. France: N. p., 1968. Web.
Carrara, P. Aspects of the magnetism of ferrous chloride; Aspects du magnetisme du chlorure ferreux. France.
Carrara, P. 1968. "Aspects of the magnetism of ferrous chloride; Aspects du magnetisme du chlorure ferreux." France.
@misc{etde_20523319,
title = {Aspects of the magnetism of ferrous chloride; Aspects du magnetisme du chlorure ferreux}
author = {Carrara, P}
abstractNote = {This work is a critical review of the existing work on ferrous chloride and presents, as well, a number of new experimental results. First, a careful analysis of the level structure of ferrous ions in the crystalline field shows that the crystalline anisotropy is of the same order of magnitude as the exchange interactions, a feature which gives rise to some particular effects, such as an upward curvature of the magnetization curve at 0 K in a perpendicular magnetic field. Further, the very low temperature (T > 0.4 K) thermal variation of both the specific heat and magnetic susceptibility evidences a magnetic component in elementary excitations. This result suggests the presence of a large magneto-elastic coupling. Finally, an experimental study of the H-T phase diagram near T{sub N} and of the critical behaviour of the specific heat and parallel susceptibility was performed. (author) [French] Ce travail constitue une analyse critique des resultats obtenus a ce jour sur le chlorure ferreux et comporte en outre quelques resultats experimentaux nouveaux. Tout d'abord, une etude precise de la structure de niveaux de l'ion ferreux dans le champ cristallin montre que l'anisotropie cristalline est comparable aux interactions d'echange, ce qui produit quelques effets originaux tels que, par exemple, l'inflexion de la courbe d'aimantation a 0 K en champ perpendiculaire. D'autre part, la variation thermique a basse temperature (T > 0.4 K) de la chaleur specifique et de la susceptibilite magnetique montre la presence d'une composante magnetique dans les excitations de basse energie. Ce resultat suggere la presence d'un couplage magneto-elastique. Enfin, nous avons realise une etude experimentale de la ligne de transition de phase (diagramme H,T) au voisinage de T{sub N}, et du comportement critique de la chaleur specifique et de la susceptibilite parallele. (auteur)}
place = {France}
year = {1968}
month = {Mar}
}