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Effect of a distribution of exchange parameters within a simple localized-itinerant model

Technical Report:

Abstract

The magnetic behaviour at T = 0 K of a system consisting of conduction electrons coupled to localized electrons submitted to an axial crystal field is studied in the molecular field approximation. We assume that the exchange parameter J varies spatially, with a Gaussian probability distribution. We define an average ionic magnetic moment and obtain the condition for spontaneous magnetic order, involving the crystal field parameter, the width and the mean value of the exchange parameter distribution. We also obtain graphs of the magnetic moment versus mean value of the exchange parameter distribution, for different distributions showing that the distribution of J`s reduces the rate of increase of magnetization versus the mean J. (author).
Publication Date:
Dec 31, 1991
Product Type:
Technical Report
Report Number:
CBPF-NF-034/91
Reference Number:
SCA: 665000; PA: AIX-24:004397; SN: 93000914205
Resource Relation:
Other Information: PBD: 1991
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL FIELD; PHASE DIAGRAMS; ANISOTROPY; EQUATIONS OF STATE; FERROMAGNETIC MATERIALS; HAMILTONIANS; INTERMETALLIC COMPOUNDS; MAGNETIC MOMENTS; PARAMAGNETISM; RARE EARTHS; 665000; PHYSICS OF CONDENSED MATTER
OSTI ID:
10109338
Research Organizations:
Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)
Country of Origin:
Brazil
Language:
English
Other Identifying Numbers:
Other: ON: DE93610314; TRN: BR9230431004397
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[16] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Iannarella, L, Guimaraes, A P, and Silva, X.A. da. Effect of a distribution of exchange parameters within a simple localized-itinerant model. Brazil: N. p., 1991. Web.
Iannarella, L, Guimaraes, A P, & Silva, X.A. da. Effect of a distribution of exchange parameters within a simple localized-itinerant model. Brazil.
Iannarella, L, Guimaraes, A P, and Silva, X.A. da. 1991. "Effect of a distribution of exchange parameters within a simple localized-itinerant model." Brazil.
@misc{etde_10109338,
title = {Effect of a distribution of exchange parameters within a simple localized-itinerant model}
author = {Iannarella, L, Guimaraes, A P, and Silva, X.A. da}
abstractNote = {The magnetic behaviour at T = 0 K of a system consisting of conduction electrons coupled to localized electrons submitted to an axial crystal field is studied in the molecular field approximation. We assume that the exchange parameter J varies spatially, with a Gaussian probability distribution. We define an average ionic magnetic moment and obtain the condition for spontaneous magnetic order, involving the crystal field parameter, the width and the mean value of the exchange parameter distribution. We also obtain graphs of the magnetic moment versus mean value of the exchange parameter distribution, for different distributions showing that the distribution of J`s reduces the rate of increase of magnetization versus the mean J. (author).}
place = {Brazil}
year = {1991}
month = {Dec}
}