Nano-Sized effects on the physical properties of la-based high-Tc superconductors and its parent compound (La2-xSrxCuO4 and La2CuO4 = Efek nano-sized terhadap sifat magnetik la-based high-Tc superkonduktor dan material induknya (La2-xSrxCuO4 dan La2CuO4)