Exchange Coupling in GdM Compounds

• Authors: K.H.J. Buschow , G.E. Grechnev , A. Hjelm , Y. Kasamatsu , A.S. Panfilov , I.V. Svechkarev
• Languages of publication: EN

Abstracts

EN

The magnetic susceptibility of ferromagnetic GdM alloys (M=Cu_{1-x}Ga_{x}, Mg, Zn) has been investigated under helium gas pressure for temperatures above T_{C}. The evaluated pressure derivatives of the paramagnetic Curie temperature, dlnΘ/dP, appeared to be remarkably different for isovalent GdMg and GdZn compounds (-11.2 and -0.1 Mbar^{-1}, respectively). An analysis of the obtained dlnΘ/dP values for GdCu_{1-x}Ga_{x} alloys and results of ab initio electronic structure calculations have revealed the essential role of 5d electrons as the mediators of exchange coupling in ferromagnetic GdM compounds. The pressure derivatives of T_{C} were calculated by employing the modern mean-field theory, as well as the spin-fluctuation model. As a result, good agreement is found with the experimental values of dlnΘ/dP.

Keywords

EN

75.20.En; 75.10.Lp

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 92
• Issue: 2
• Pages: 267-270

Dates

published

1997-08

Contributors

author

K.H.J. Buschow

• Van der Waals-Zeeman Institute, University of Amsterdam Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

author

G.E. Grechnev

• B. Verkin Institute for Low Temperature Physics, Kharkov, 310164, Ukraine

author

A. Hjelm

• Helax AB, Box 1704, 751 47 Uppsala, Sweden

author

Y. Kasamatsu

• Kure National College of Technology, 2-2-11 Agaminami, Kure 737, Japan

author

A.S. Panfilov

• B. Verkin Institute for Low Temperature Physics, Kharkov, 310164, Ukraine

author

I.V. Svechkarev

• B. Verkin Institute for Low Temperature Physics, Kharkov, 310164, Ukraine