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The Reconstructive Crystal Structure and the Exchange Energy

Published online by Cambridge University Press:  26 February 2011

Ahmad Yazdani ,
Reza Osati Araghi  and
Farid Arya
Ahmad Yazdani
Affiliation:
yazdania@modares.ac.ir, University, Physics, Jalale Ahmad, Tehran, N/A, Iran
Reza Osati Araghi
Affiliation:
Reza.osaty@gmail.com, Tarbiat Modares University, Tehran, N/A, Iran
Farid Arya
Affiliation:
Niazi_physics2005@yahoo.com, Tarbiat Modares University, Tehran, N/A, Iran
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Abstract

In order to describe the role of temperature variation on suppress of broad range of magnetic transition, the effect of annealing on different samples of a Gd-based intermetallic compound (i.e., Gd2Au) is investigated. The X-ray, AC and D.C susceptibility and electrical resistivity measurements for different annealed samples revealed that: (i) A great exchange dispersion is observed in A.C susceptibility (ii) This unstable exchange can be stabilized at certain annealing temperature, where the short rang unstable Ferromagnetic (F.M) breaks down or even changes to an Antiferromagnetic (AF.M) stable state. (iii) The DC susceptibility shows a spin-glass like transition temperature at TN= 61 K, above which the compound exhibits a completely paramagnetic (P.M) behavior and is field independent. (iv) the iso-termal magnetization does not follow the field induced transition (F.I.T) and behaves completely as a paramagnet which is independent of the field up to the highest available fields. The electrical resistivity measurement shows: a) A pronounced sharp bend at TN=61 K is manifested in ρ(T). b)some strong peak of X-ray pattern change into double adjacent lines in some intervals of low temperatures

Keywords

PHY
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T10-20
Copyright
Copyright © Materials Research Society 2007

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References

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