Abstract
In this work, we report on the DC magnetic properties of Ho doped ZnO, Zn0.8−4x Ho x O y (0.05≤x≤0.10), polycrystalline samples prepared by the so-called solid state reaction method. Magnetic measurements, M–H and M–T, done by using a PPMS magnetometer, show a paramagnetic behavior including indirect antiferromagnetic coupling between some Ho3+ magnetic moments. In other words, the negative values of the Curie–Weiss temperatures, θ, for the polycrystalline samples with six different Ho concentrations indicate that there is an effective antiferromagnetic coupling among the magnetic moments of Ho3+ ions. However, the decrease in the magnitude of θ with increasing x indicates that this coupling decreases with increasing amount of Ho in the compounds. Furthermore, the effective magnetic moments, μ eff, per Ho atom calculated from the 1/χ−T curves gradually increase with increasing concentration. Therefore, the trends of the magnitudes of θ, and μ eff values clearly indicate that apart from the antiferromagnetic coupling there is also an increasing contribution of a ferromagnetic coupling with increasing x. Hence, one may also conclude that the compounds studied seem to have a kind of spin-glass behavior.
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This work was supported by Cukurova University (Adana/Turkey) under the project number of AMYO2011BAP3.
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Akyol, M., Ekicibil, A. & Kiymaç, K. DC Magnetic Properties of the Ho doped ZnO Compounds. J Supercond Nov Magn 26, 3257–3262 (2013). https://doi.org/10.1007/s10948-013-2135-2
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DOI: https://doi.org/10.1007/s10948-013-2135-2