Magnetic Properties and Nuclear Magnetic Resonance of Diluted (Gd, Zr)Zn2

Abstract

The magnetic and NMR properties of Zr1−xGdxZn2 (0≤x≤0.05) have been investigated to clarify the influence of localized magnetic moments on conduction electron ferromagnet ZrZn2. The dependence of magnetization intensity of Gd concentration shows that the Gd atoms are S states and the spin polarization of conduction electrons by a localized Gd moment does not take place. Moreover, ferromagnetism would disappear above x=0.025. The hyperfine field of Zr in ZrZn2 is −38 kOe, and is remarkably less than usual for transition metals. This result is explained by assuming mixing of the 4d and 5s wavefunctions.

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

“…The θ values, listed in Table I, remain positive and increase monotonously with x up to x = 0.10, in contrast with the Gd-doped ZrZn 2 where θ values decreased with Gd concentration. 7 Despite the fact that the x = 0 sample has no magnetic constituents, the value of its paramagnetic moment μ…”

“…6) prevented the enhancement of the overall magnetization upon doping. 7 Moreover, the Curie temperature T C and the Weiss-like temperature θ decreased with increasing x in Zr 1−x Gd x Zn 2 , resulting in the suppression of the ferromagnetic state at x c = 0.025. 7 Perhaps not as surprising, nonmagnetic element doping also resulted in the suppression of the Curie temperature T C .…”

“…7 Moreover, the Curie temperature T C and the Weiss-like temperature θ decreased with increasing x in Zr 1−x Gd x Zn 2 , resulting in the suppression of the ferromagnetic state at x c = 0.025. 7 Perhaps not as surprising, nonmagnetic element doping also resulted in the suppression of the Curie temperature T C . 8 The similarity between the magnetic and nonmagnetic doping effects is quite striking but could possibly be explained by the instability of ferromagnetism in ZrZn 2 , as predicted by the band structure with a narrow peak at the Fermi surface.…”

“…An addition of local moment to the itinerant matrix was attempted via Gd 3+ substitution in Zr 1−x Gd x Zn 2 . 7 Surprisingly, it appeared that the instability of the itinerant magnetism in ZrZn 2 (Ref. 6) prevented the enhancement of the overall magnetization upon doping.…”

“…However, the itinerant magnetic moment was suppressed to zero upon Gd doping of ZrZn 2 . 7 for. Er doping as small as x = 0.02 in (Sc 1−x Er x ) 3.1 In induced a cluster-glass state.…”