The easy axis of the magnetic response of the conduction electrons of yttrium and rare earths

Details The easy axis of the magnetic response of the conduction electrons of yttrium and rare earths The easy axis of the magnetic response of the conduction electrons of yttrium and rare earths

2003-04-04

arxiv.org/abs/cond-mat/0304112v1

Physics

Condensed Matter

Materials Science

Scientific paper

We describe a scheme for first-principles calculations of the static, paramagnetic, spin susceptibility of metals with relativistic effects such as spin-orbit coupling included. This gives the direction for an applied modulated magnetic field to maximise its response. This easy axis depends on the modulation's wave-vector q. For h.c.p. yttrium we find the peak response at a q= (0,0,0.57)pi/c, coincident with a Fermi surface nesting vector, to have an easy axis perpendicular to q. This is consistent with the {\it helical} anti-ferromagnetic order found in many dilute rare earth-Yalloys. Conversely, the easy axis for the response to a uniform magnetic field lies along the c-axis. The conduction electrons' role in the canting of magnetic moments in Gd-Y alloys and other rare earth materials is mooted.

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