LOW TEMPERATURE MAGNETIC SUSCEPTIBILITY OF FERROUS OXALATE DIHYDRATE.
CARNEGIE INST OF TECH PITTSBURGH PA DEPT OF PHYSICS
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The magnetic susceptibility of powdered FeCOO2. 2H2O has been measured between 1.3 and 300 K. X-ray structural evidence indicates that Fe ions in this material are linked in chains by oxalate groups. Assuming an antiferromagnetic intrachain exchange constant J -4.9K, it is possible to obtain a reasonable fit of the data above 25 K with the susceptibility computed for Ising interactions and S2. If the upper maximum is due to chain ordering, the lower maximum would then appear to be associated with the cooperative onset of long range spin order in three dimensions induced by interchain coupling. Author