Abstract
Specific heat and electrical resistivity were measured on La 2−X Sr X NiO 4+δ with various Sr concentrations as a function of temerature. The behaviors of electrical resistivity and lattice constants show a marked change at X⋃0.5 (Xc). The specific heat shows a hump at about 6K in C/T vs. T 2 plot for all of samples annealed in air. For the samples annealed in hydrogen no hump is observed. The relationship between Xc and interstitial oxygen defect is discussed.
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