Superconductivity and magnetism of LaBa2Cu3-xMxOy (M=Ni and Zn)

✍ Scribed by Yoshiki Takano; Takamichi Inaba; Kunihiro Yamamoto; Kazuko Sekizawa

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 164 KB
• Volume: 169
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(91)90387-t

✦ Synopsis

The effects of Ni and Zn substitutions for Cu on the superconducting transition temperature TC have been investigated in LaBanCusCly. The sample of LaBazCusOy with TC of 90 K was obtained by a particular process of heating and cooling in flowing nitrogen and the final annealing at 310 'C in flowing oxygen. The decrease rate of Tc with x in LaBasCus-xMxOy (H=Ni and Zn) was reduced by the prolongation of the final annealing (40h + 80h), while TC of pure LaBazCusOy was not affected by the prolonged final annealing.

This reduced decrease rate of Tc in La compounds was still twice as large as that in heavy rare earth compounds.

The analysis of oxygen content showed that this increase of TC of substituted samples was not due to the increase in oxygen content but due to the improvement of oxygen ordering.