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Magnetic and Structural Properties of the 'Brown Phase' Solid Solution Ba(Nd2-xLax)CuO5



Winnie K. Wong-Ng, L Swartzendruber, James A. Kaduk, Lawrence H. Bennett


The compounds BaR2CuO5 (R = Y, and lanthanides) are well known impurities that often coexist with the high Tc superconductors, Ba2RCu3O6+X. With R=La and Nd, brown color solid solutions (Ba1+xR2-xCuO5-x) form instead of the green phase, BaR2CuO5 (lanthanides with ionic radii smaller than that of Sm). A complete solid solution of Ba(Nd2-xLaxCuO5 exists with the tetragonal space group P4/mbm. Crystallographic studies of selected members (x=0.2, 0.6, 1.2, and 1.6) by x-ray Rietveld refinement technique showed the structure consists of RO8 and BaO10 cages, and square planar CuO4 units. As x increases in Ba(Nd2-xLax)CuO5, the size of these RO8 and BaO10 cages increases. BaLa2CuO5 was confirmed to be ferromagnetic at 5K; despite the isostructural property of BaLa2CuO5 and BaNd5CuO5, the Nd-analog was found to be antiferromagnetic. As x in Ba(Nd2-xLax)CuO5 increases between 0 and 2, the amount of ferromagnetism increases.
Physica C-Superconductivity and Its Applications
No. 3


Ba(Nd<sub>2-x</sub>La<sub>x</sub>)CuO<sub>5</sub>, brown phase, magnetic properties, superconductor related phase


Wong-Ng, W. , Swartzendruber, L. , A., J. and Bennett, L. (2003), Magnetic and Structural Properties of the 'Brown Phase' Solid Solution Ba(Nd<sub>2-x</sub>La<sub>x</sub>)CuO<sub>5</sub>, Physica C-Superconductivity and Its Applications (Accessed February 24, 2024)
Created July 1, 2003, Updated February 19, 2017