Abstract
Experimental results of the single-crystal X-ray diffraction, XPS, ac-magnetic susceptibility (ac- χ), dc-magnetization M( T), and electrical resistivity ( ρ) measurements for the hexagonal Th 7Fe 3-type Gd 5Y 2Pd 3 single crystal are presented. Anomalies in (ac- χ), ( T) and M( T)-curves have allowed to establish that Gd 5Y 2Pd 3 undergoes a long-range ferromagnetic-type ordering at T C = 263 K, followed by a spin-reorientation below 190 K. The magnetization data indicate that there is an excess of the magnetic moment for the Gd 3+ ions. The observed XPS, magnetic and electrical resistivity behaviour points to the coexistence of localized magnetism from the magnetic Gd 3+ ions and itinerant ferromagnetism from 4d- and 5d-electron bands. We discuss the magnetic behaviour of the Gd 7− x Y x Pd 3 solid solutions in terms of three competitive mechanisms: RKKY-interaction, magnetic frustration and spin-fluctuation.
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