Title :
Substitution of Mn for Cu in the high Tc superconductor YBa2Cu3O7-δ
Author :
Jardim, R.F. ; Gama, S. ; de Lima, O.F. ; Torriani, I.
Author_Institution :
Fundacao de Technol. Ind., CEMAR, Lorena, Brazil
fDate :
3/1/1989 12:00:00 AM
Abstract :
Samples of YBa2(Cu1-xMnx)3 O7-δ, with x=0.0, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.20, were prepared by the solid diffusion method. Superconductivity with Tc in the range of 84-92 K was observed through electrical resistivity and magnetic susceptibility measurements. The substitution of Mn for Cu practically did not affect the onset temperature in the resistive transition, although a strong correlation between the transition width broadening and the increase of Mn content was observed. This fact is consistent with the reduction of the superconducting volume fraction determined through the normalized susceptibility data. X-ray diffraction revealed the occurrence of additional phases increasing with the Mn concentration
Keywords :
X-ray diffraction examination of materials; barium compounds; electrical conductivity of crystalline semiconductors and insulators; high-temperature superconductors; magnetic susceptibility; manganese compounds; superconducting transition temperature; yttrium compounds; 84 to 92 K; Mn content; X-ray diffraction; YBa2(Cu1-xMnx)3O 7-δ; electrical resistivity; high Tc superconductor; high temperature superconductors; magnetic susceptibility; onset temperature; resistive transition; solid diffusion method; superconducting volume fraction; transition width broadening; Magnetic susceptibility; Phase measurement; Resistors; Superconducting magnets; Superconducting transition temperature; Superconductivity; Temperature dependence; Temperature distribution; Temperature measurement; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
