Spontaneous magnetostriction in the Gd-Y system: analysis of phase transformations
A. B. Beznosov, E. L. Fertman, V. V. Eremenko, and P. P. Pal-Val
B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61164, Ukraine
V. P. Popov and N. N. Chebotayev
V. N. Karazin Kharkov National University, 4 Svoboda Sq., Kharkov 61077, Ukraine
Received December 11, 2000
The transformations of magnetic and lattice subsystems states of Gd100-xYx (x=0, 5.5, 7.5, 10.2) alloys have been studied at temperatures 5-370 K in magnetic fields up to 4 kOe. The temperature dependences of elastic modules, thermal expansion, low field magnetization and magnetic anisotropy parameters were obtained. The linear spontaneous striction DL(T)/L=xh2 was analized, and the effective order parameters h and magnetostrictive parameters x were evaluated for the four magnetic phases (canted ferromagnetic, deforming ferromagnetic helix, ferromagnetic helix, and the ferromagnetic cone, respectively): xcf=2.2×10-5, xdh=- 5.3×10-5, xfh=7.1×10-5, xfc=1.4×10-3.