Synthesis and properties of La1-xSrxNiO3 and La1-xSrxNiO2 |
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| Affiliation: | Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China |
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| Abstract: | Superconductivity has been realized in films of La1-xSrxNiO2. Here we report synthesis and characterization of polycrystalline samples of La1-xSrxNiO3 and La1-xSrxNiO2 (0 ≤ x ≤ 0.2). Magnetization and resistivity measurements reveal that La1-xSrxNiO3 are paramagnetic metal and La1-xSrxNiO2 exhibit an insulating behavior. Superconductivity is not detected in bulk samples of La1-xSrxNiO2. The absence of superconductivity in bulk La1-xSrxNiO2 may be due to the generation of hydroxide during reduction, a small amount of nickel impurity, or incomplete reduction of apical oxygen. The effect of interface in films of La1-xSrxNiO2 may also play a role for superconductivity. |
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| Keywords: | nickel oxide superconductivity |
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