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Stabilization of Reentrance AFM on Gd 2 Al System in a Certain Electron Concentration
Author(s) -
Yazdani A.,
Gardner J. St.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199808)208:2<465::aid-pssb465>3.0.co;2-9
Subject(s) - condensed matter physics , antiferromagnetism , paramagnetism , ferromagnetism , magnetic moment , magnetic structure , electron , materials science , chemistry , magnetic field , physics , magnetization , quantum mechanics
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. Gd 2 Au) and antiferromagnetic system like e.g. Gd 2 Al 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 (Al 1− x Au x ) 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 Gd 2 Al, 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 (Au x A 1− 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 Σε ij J ij = 0, resulting in a paramagnetic behaviour (θ p ≈ 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.