Abstract
La_2CuO_4, the parent compound of the La system high-temperaturesuperconductors, can be rendered superconducting at～40 K by substituting A~(2+)(A=Ca, Sr, Ba) at La~(3+) sites or introducing excess oxygen to compound by annealingunder high oxygen pressures as well as other treatments. It is a hard Moot insulatorof which crystal cells contain Cu-O sheet, and 3D antiferromagnetic property has
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