Spin-Density Transitions in Dilute Yttrium - Alloys.
Specific heat measurements are performed in magnetic fields from 0 to 2 Tesla on single crystal samples of YGd ranging in Gd concentration from 1.0 to 4.4 at. % Gd. In conjunction with these specific heat measurements, neutron diffraction, ac susceptibility, and magnetization measurements were also performed on the same samples. The experimental results indicated the presence of long-range magnetic ordering. In zero field, helical ordering periodic over a wavelength of ~20 A is observed while anisotropic effects are present for magnetic fields applied parallel and perpendicular to the c-axis. The results in zero fields and in magnetic fields parallel to the c-axis are explained qualitatively and quantitatively in terms of a stabilization of a spin-density-wave of conduction electrons. The theory is also able to qualitatively explain the results for magnetic fields applied perpendicular to the c-axis.
- Pub Date:
- Physics: Condensed Matter