Abstract
The effects of Cr2O3 substitution on DyBa2Cu3-xCrxO7-δ (x = 0 to 0.70) superconductor were investigated. The samples were characterized by using dc electrical resistance measurements, powder X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) observations. XRD patterns showed impurity peaks for x ≥ 0.2 samples SEM micrographs showed no change in the grain size for x ≤ 0.4. However, partial melting and increase in grain size was observed for higher Cr content (x > 0.4). The orthorhombicity, e $$ =\frac{b-a}{b+a} $$ of the unit cell initially increased with Cr substitution. The resistance-temperature curves showed metallic normal state behavior for x = 0 and semiconductor-like behavior for all Cr-added samples. A pronounced suppression of the transition temperature was observed as soon as Cr was substituted for 0 < x ≤ 0.2 followed by a lower suppression for 0.2 < x ≤ 0.7. Two distinct regions of superconductivity suppression were observed, and the different suppression mechanisms acting in those regions are discussed in this paper.
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