UNSPECIFIED. (1998) Stabilization of reentrance AFM on Gd2Al system in a certain electron concentration. PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 208 (2). pp. 465-472. ISSN 0370-1972

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Abstract

A random mixture of two compounds with different type of magnetic ordering which can lead to a new phase with different magnetic characteristics is studied. Such an interesting random magnetic system can be formed by a ferromagnet (e.g. Gd2Au) and antiferromagnetic system like e.g. Gd2Al with localized magnetic moments where, in principle, the dominant exchange interactions are those of the nearest neighbours. A systematic study on the solid solutions of the type Gd-2(Al1-xAux) is reported here. (I) The roles and effects of conduction electron concentration "c.e.c." on the magnetic structure, where the magnetic behaviour is shape dependent (0.2 < x < 0). (II) The cause of magnetic instability of Gd2Al, which should be due to the "c.e". (III) The critical stabilized point by decreasing "c.e.c.". It is shown that the magnetic phase of the pseudobinary intermetallic compound Gd-2(AuxAl1-x) becomes unstable by increasing the conduction electron concentration through the variation in unit cell dimensions. It becomes stable at a critical value of c.e.c., where Sigma-epsilon(ij) J(ij) = 0, resulting in a paramagnetic behaviour (theta(p) approximate to 0 to 5) at x = 0.3. It is shown that the instabilities of the crystal and magnetic structure are functions of c.e.c. and depend on the Fermi sphere K-F which is the main cause of the shape dependence of the magnetic structure of the sample.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICA STATUS SOLIDI B-BASIC RESEARCH
Publisher:	WILEY-V C H VERLAG GMBH
ISSN:	0370-1972
Date:	August 1998
Volume:	208
Number:	2
Number of Pages:	8
Page Range:	pp. 465-472
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/15463

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