A simple model approach to localized-itinerant magnetism: application to rare-earth intermetallics
- 1. Universidade Federal Rural do Rio de Janeiro (Brazil). Dept. de Fisica
- 2. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro
Description
The combined role of intraband and electron-localized moment exchange in determining the magnetic behaviour of a system composed of itinerant electrons and localized magnetic moments is investigated. Having in mind rare-earth-transition metal and rare-earth-normal metal intermetallic compounds, the critical temperature versus de Gennes factors and the temperature dependence of magnetizations and susceptibilities of the two magnetic species are studied. Results are obtained for two cases, a) a delta-like band (narrow band limit), and b) a parabolic density of states, using the molecular field approximation both in the treatment of intraband interaction (Stoner-like description) and electron-localized spin exchange. Some comments are made on the parallel between computed and measured magnetic quantities in the systems RAl2, RFe2 and R(Fe sub(1-x)Al sub(x))2 (0<x<1 and R identical to heavy rare-earth). (Author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Investiga-se o papel combinado da intrabanda e da troca de momento do eletron e do localizado na determinacao do comportamento magnetico de um sistema composto de eletrons itinerantes e momentos magneticos localizados. Tendo em mente compostos intermetalicos de metais de transicao de terras raras e metais normais de terras raras, estudam-se a temperatura critica versus os fatores de Gennes e a dependencia da temperatura das magnetizacoes e susceptibilidades das duas especies magneticas. Obtem-se resultados para dois casos, a)uma banda tipo delta (limite de banda fina), e b) uma densidade parabolica de estados, usando a aproximacao de campo molecular tanto no tratamento da interacao intrabanda (descricao do tipo Stoner) quanto na troca de spin do eletron e do localizado. Alguns comentarios sao feitos sobre o paralelo entre quantidades magneticas computadas e medidas nos sistemas RAl2, RFe2 e R(Fe sub(1-x)Al sub(x))2 (0<x<1 e R identico a terras raras pesadas). (Autor)Files
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Additional details
Publishing Information
- Imprint Pagination
- 28 p.
- Report number
- CBPF-NF--023/81
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 13700925
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- BAND THEORY; CRITICAL TEMPERATURE; CURIE POINT; INTERMETALLIC COMPOUNDS; MAGNETIC SUSCEPTIBILITY; MAGNETISM; MAGNETIZATION; RARE EARTHS; SPIN; TEMPERATURE DEPENDENCE; THEORETICAL DATA
- Descriptors DEC
- ALLOYS; ANGULAR MOMENTUM; DATA; ELEMENTS; INFORMATION; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; METALS; NUMERICAL DATA; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE