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Article Details

  • Article Code : FIRAT-AKADEMI-8665-4429
  • Article Type : Araştırma Makalesi
  • Publication Number : 3A0081
  • Page Number : 34-38
  • Doi : 10.12739/NWSA.2017.12.4.3A0081
  • Abstract Reading : 796
  • Download : 124
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Issue Details

  • Year : 2017
  • Volume : 12
  • Issue : 4
  • Number of Articles Published : 2
  • Published Date : 1.10.2017

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Physical Sciences

Serial Number : 3A
ISSN No. : 1308-7304
Release Interval (in a Year) : 4 Issues

THE EFFECT OF SMALL SUBSTITUTIONS OF Gd ON THE MAGNETIC PROPERTIES OF SYSTEM Y (?Co?_(1-x) ?Al?_x)?_2

Zaur GAMİSHİDZE1

Compound Y?Co?_2 is a zonal metamagnet. It was found that partial substitution of cobalt for aluminum in Y?Co?_2 leads to a decrease in the matamagnetic transition field H_m and the emergence of weak zonal ferromagnetism in the system Y(?Co?_(1-x) ?Al?_x )_2 at x?0.12. This can significantly modify the character of the effect of rare-earth impurities on the d–subsystem. To exclude the effect of the crystal¬li¬ne field, gadolinium was used as a magnetizing element. Hence the magne¬tic properties of the system Y_(1-t) ?Gd?_t (?Co?_(1-x) ?Al?_x )_2 were studied in this work. We confined ourselves to the aluminum concentration range (0?x?0.105) in the limits of which initial compounds Y(?Co?_(1-x) ?Al?_x )_2 are paramagnets and undergo a metamagnetic transition in the field. It is shown that, with an increase in the concentration of Gd (with constant concentration of Al), the transition from paramagnetism to ferromagne¬tism takes place. When the content of Al increases, the area of ferro¬magnetism expands, and the paramagnetic state area shrinks. The behavior of the compounds under study in the field depends on the ratio between the degrees of magnetization of cobalt M_Co and gadolinium ? M?_Gd subsystems. If M_(Co ) in a weak field is greater than M_Gd , gadolinium impurities shift the metamagnetic transition field towards weak fields, as the molecular field acting on cobalt from the gadolinium subsystem H_m is summed with the external magnetic field H. .

Keywords
Metamagnetizm, Magnetization, Susceptibility, Density of States, Exchange Interaction ,

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Authors

Zaur GAMİSHİDZE (1) (Corresponding Author)

Batumi Shota Rustaveli State University
zaurgamishidze@gmail.com | 0000-0001-8101-9704

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References
[1] Levitin, R.Z. and Markosyan, A.S., (1988). Usp. Fiz. Nauk 155, 623 [Sov. Phys. Usp. 31, 730 (1988)].