High-Pressure Synthesis of AlSr_2Ho_<1-x>Ca_xCu_20_7
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The Al-1212 cuprates, AlSr_2Ho_<1-x>Ca_xCu_2O_7, are prepared at 2 GPa to determine the critical value of x required for the appearance of superconductivity. The Al-1212 cuprates exhibit superconductivity below 18 -30 K. Energy dispersive X-ray (EDX) analysis reveals that the critical value of x is approximately 0.56. This value is close to the optimum x value which gave the maximum superconducting transition temperature (Tc) of the Ga-1212 cuprate studied previously. The very high critical value suggests a high concentration of localized holes.
- 社団法人応用物理学会の論文
- 1997-07-01
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