Effects of potassium substitution on the AC magnetic susceptibility of MgB2
Abstract
Mg1−xKxB2 with 0 ≤ x ≤ 0.5 were prepared via solid-state reaction from MgB2 and KCl powders.
Successful substitution of K was confirmed from analysis of the XRD data. χ' measurements show that TC increases with increasing x, x = 0.2 being the maximum, after which a decrease in TC was observed. This result supports the prediction of the BCS theory in which there is an increase in TC with the introduction of holes in this material. There is no apparent change on the magnetization as x increases. Doping with K reduces the intergranular connectivity of the grains resulting to pronounced intragranular loss peak in the χ" measurements. The magnitude of the AC loss peak increases with increasing x, while its width decreases.
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