From Cuprate to Nickelate: Evolution of the Normal State Properties with Ni from La1.85Sr0.15CuO4 to La1.85Sr0.15NiO4
V.L. Bezusyya, A. Malinowskia, R. Minikayeva, W. Paszkowicza, P. Dziawaa and R. Gorzelniakb
aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
bInstitute of Low Temperature and Structure Research, PAS, Okólna 2, 50-422 Wrocław, Poland
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The influence of Ni doping on the normal-state pseudogap in La1.85Sr0.15CuO4 is studied by dc magnetic susceptibility measurements, accompanied by X-ray powder diffraction analysis and resistivity measurements. The measurements are carried out on the polycrystalline La1.85Sr0.15Cu1-yNiyO4 samples in the whole doping range from y=0.01 up to y=1. The temperature of pseudogap opening is found to decrease above y=0.05 and to vanish when y exceeds 0.07. At small Ni content, up to y=0.07, the magnetic moment induced by Ni is constant and equal to 0.7 μB per Ni, while for larger y it increases abruptly and reaches about 1.6 μB per Ni ion for y = 0.5. The dependence of the normal-state resistivity on temperature evolves smoothly from the metallic-like for small y, to the variable range hopping, described by the Mott law with the exponent 1/4, for samples with y>0.15.
DOI: 10.12693/APhysPolA.118.402
PACS numbers: 74.25.Ha, 74.72.-h, 74.72.Kf, 75.30.-m