The magnetic moment at the yttrium site in Y-Fe compounds: pressure dependence of the magnetisation and hyperfine field

Abstract

The pressure dependence of the magnetisation of Y2Fe17, Y6Fe23 and YFe2 at 4.2 K has been deduced from forced volume magnetostriction measurements in fields up to 12 T. The pressure dependence of the 89Y hyperfine field in the above compounds and YFe3 has been measured using NMR. The results are consistent with a model in which a moment of approximately=-0.4 mu B exists at the Y site of all four compounds as found in computer calculations for YFe2.

Magnetoelastic effects in the YFe10V2 ferromagnetic alloy

“…If the volume magnetostriction was negative the thermal expansion coefficient would continuously increase from 5 to 300 K and its value at 300 K would be larger than that above T c . It is worth noticing that a positive volume magnetostriction is also observed in other iron based intermetallic compounds such as Y 2 Fe 17 [8] or Y 2 Fe 14 B [9]. This behaviour is quite consistent with the well known fact that in iron rich compounds, exchange interactions, in agreement with the Néel-Slater curve, increase with interatomic distances or local magnetic polarisation.…”

The analysis of the magnetic properties in the intermetallic YxGd1−xNi3 compounds

“…It was previously reported for the Gd 1 À x Y x Ni 5 system that yttrium carries a very small magnetic moment which comes from its 4d electrons [22]. Similar behaviour was observed in the case of Y-Co and Y-Fe compounds where calculations were made in two assumption as for non-magnetic Y and À 0.4 m B /Y [23,24]. Thus, if we assume that Y is non-magnetic probably we do a small mistake which only slightly influences the final result.…”

First principles calculations, neutron, and x-ray diffraction investigation of Y3Ni13B2, Y3Co13B2, and Y3Ni10Co3B2

“…This is consistent with a negative polarization of the valence electrons at the Y sites by the neighboring Co magnetic moments due to Y 4d-Co 3d states mixing, as is usually found in yttrium 3d transition metal compounds. [16][17][18][49][50][51][52] Although the LSDA has proven to describe remarkably accurate many properties of weakly correlated electron systems, we cross-checked the present LSDA results by using a "beyond-LSDA" method, the GGA, as implemented in the FPLO9 code. In the GGA approach, a gradient expansion of the exchange and correlation energy is introduced, which provides an enhancement factor, function of density and scaled gradient, over the LDA exchange.…”