Effect of CuCo and coupled ErCaCuCo substitution upon superconductivity in ErBa2Cu3O7 − δ

✍ Scribed by R.G. Kulkarni; K.M. Pansuria; U.S. Joshi; G.J. Baldha; D.G. Kuberkar

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 558 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(96)00090-2

✦ Synopsis

The structural and superconducting properties of Cu-Co and coupled Er-Ca/Cu-Co substitution in ErBa,Cu,O,-, have been studied using X-ray diffraction, a.c. susceptibility, resistivity and oxygen content measurements. The oxides (Er,~,Ca,)Ba,(Cu,_,Co,),O, have been synthesized for 0 5 x5 0.15 and 0 5 ys 0.45. The effect of increasing the Co-concentration in ErBa,(Cu,Jo,),O, for 0 5 x 5 0.15 is to lower the carrier concentration and decrease T,, which is attributed to the hole filling by Co. This suppression in T, has been compensated for by appropriate hole doping with Ca, in (Er,~,Ca,)Ba,(Cu,_,Co,),0,, which shows that for a fixed Co-content T, increases dramatically as the Ca-content increases, leading, for instance, to the oxide (Er,.