Abstract
Samples from the oxide series of solid solutions La1.85Sr0.15Cu1−xZn x O4, quenched from 1100°C, have been characterized by X-ray powder analysis. We report on the structural chemistry and on measurements of the electrical resistivity, magnetization, ac susceptibility and specific heat of these samples. Zinc was found to statistically replace the copper atoms in the body centered tetragonal K2NiF4-type of structure up to values ofx smaller than 0.15. At higher zinc-concentrations (0.15<x<0.45) the crystal structure transformes into the orthorhombically distorted K2NiF4-type, known for the low-temperature form of Sr-and Zn-free La2CuO4. Limited solid solutions are encountered when Cu is substituted by Cd and Hg. Whilst the Zn-free sample La1.85Sr0.15CuO4 was superconducting with a sharp onset at 35 K, substitution of Cu by Zn by as little as 6 mole percent was sufficient to suppress superconductivity belowT c<4.5 K. Isoelectronic substitution of Cu by (Ni0.5Zn0.5) was found to cause an even larger degradation ofT c than equivalent amounts of Zn. At the superconducting transition the discontinuity of the specific heat ΔC p is observed in agreement with recent publications, but is found to decrease with Zn substitution. A linear term inC p(T) is resolved at low temperatures which significantly rises upon Cu/Zn substitution.
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Hilscher, G., Pillmayr, N., Eibler, R. et al. Structural chemistry, electrical resistivity, magnetization and specific heat in La1.85Sr0.15Cu1−xZn x O4 . Z. Physik B - Condensed Matter 72, 461–470 (1988). https://doi.org/10.1007/BF01314527
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DOI: https://doi.org/10.1007/BF01314527