Abstract
YCo2 compound is an exchange-enhanced Pauli paramagnet on the verge of being magnetic. Topological or chemical disorder can induce in it ferromagnetic long-range ordering. The influence of Fe substitution and quenched-in topological disorder on the magnetic properties of YFe0.03Co1.97 and YFeCo is studied. Structural and magnetic properties of these compounds are analyzed by means of X-ray diffraction, vibrating sample magnetometry, Mossbauer spectroscopy and AC magnetic susceptibility measurements. All samples crystallize in cubic MgCu2-type phase with lattice constant changing from 7.223 A for YCo2 through 7.221 A for YFe0.03Co1.97 to 7.313 A for YFeCo. Fe atoms are responsible for stabilization of magnetic moments on Co, and mictomagnetism is observed in YFe0.03Co1.97 sample. Upon further substitution, as in YFeCo, long-range ordering appears. The Mossbauer spectra permitted distinction between two magnetically inequivalent Fe sites, as reported earlier for YFe2.
Highlights
The Y–Co system has been studied extensively in last decades
Structural and magnetic properties of these compounds are analyzed by means of X-ray diffraction, vibrating sample magnetometry, Mossbauer spectroscopy and AC magnetic susceptibility measurements
Fe atoms are responsible for stabilization of magnetic moments on Co, and mictomagnetism is observed in YFe0.03Co1.97 sample
Summary
The Y–Co system has been studied extensively in last decades. One of the most interesting is YCo2 intermetallic compound, which can be described as an exchange-enhanced Pauli paramagnet. The Stoner criterion is almost fulfilled in this compound, and even an insignificant change in band filling can result in a considerable effect on the density of states at the Fermi level [1]. This compound is on the verge of being magnetic and small perturbations, as for example, substitution of nonmagnetic Y by another element or introduced disorder can bring ferromagnetic long-range ordering [2]. The proposed system is appropriate to determine the influence of Fe substitution and the influence of topological and chemical disorder on magnetic properties of YFexCo2-x. The latter condition, which is the topological and chemical disorder, can be realized by the synthesis of metastable, slightly disordered samples by the rapid quenching of the melt
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