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.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.