Abstract
Zeeman splitting of Mossbauer spectra of57Co doped into Eu2CuO4 and Gd2CuO4 indicates magnetic ordering of Cu moments for temperatures below about 150 K in Eu2CuO4 and below about 200 K in Gd2CuO4.
Highlights
Since the discovery /1, 2/ of electron superconductivity in R I.g5M0.15CuO4_y as well as magnetic order /3/ in these compounds when the proportion of M is small, there has been widespread interest in the magnetic properties of the parent compound R2CuO4.Neutron scattering studies of Eu2CuO4 and Gd2CuO4 are difficult because of large neutron absorption cross section in Eu and Gd, but magnetic susceptibility and magnetization studies have been reported on single crystal samples of these materials
Both Eu2CuO4 and Gd2CuO4 were made by dissolving stoichiometric amounts of R203 and CuO, with co-precipitation and subsequent calcining, or alternatively by grinding together the constituents, and subsequent sintering
The final firing of the powdered samples was done in air at 900 ~ C
Summary
Zeeman splitting of Mossbauer spectra of 57Co doped into Eu2CuO4 and Gd2CuO4 indicates magnetic ordering of Cu moments for temperatures below about 150 K in Eu2CuO4 and below about 200 K in Gd2CuO4
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