The effect of chemical pressure in rutheno-cuprates

✍ Scribed by N. Nikseresht; A. Khajehnezhad; H. Hadipour; M. Akhavan

• Book ID: 104084447
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 521 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2010.01.019

✦ Synopsis

We have studied the effect of negative chemical pressure in the RuGd 1.5 (Ce 0.5Àx Pr x )Sr 2 Cu 2 O 10Àd with Pr content of 0.0 6 x 6 0.2. This is also investigated using the bond length results obtained from the Rietveld refinement analysis. The c parameter and cell volume increase with x for 0.0 6 x 6 0.15. The width of the resistivity transition also increases with Pr concentration, indicating higher inhomogeneity and oxygen deficiency. The difference in the ionic valences of Pr 3+,4+ and Ce 4+ causing different hole doping, the difference in the ionic radii, and oxygen stoichiometry affect the superconducting transition. The magnetoresistance shows a cusp around 135 K which lies between the antiferromagnetic and ferromagnetic transition temperatures, which is probably due to the presence of a spin glass region. There exist two magnetic transition temperatures for 0.0 6 x 6 0.2 which respectively change from T M = 155 K to 144 K and from T irr = 115 K to 70 K. The magnetization versus applied magnetic field isotherms at 77 K and 300 K show that the remanent magnetization and coercivity are lower for samples with higher Pr content.