Magnetic properties of RCo2 Ge2 compounds (R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y)

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Abstract
The magnetic properties of the RCo2 Ge2 compounds with R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y have been investigated. It was found that the compounds for which R=La, Ce, Sm, Er, Tm, Yb, and Y exhibit paramagnetic behavior down to 4.2 °K with ErCo2Ge2 and TmCo2Ge2 probably ordering at lower temperatures. The compounds for which R=Gd, Tb, Dy, and Ho order antiferromagnetically. PrCo2Ge2 and NdCo2Ge2 show an unusual magnetic behavior. PrCo2Ge2 exhibits a susceptibility which decreases from 4.2 °K, then rises to a peak at 27.5 °K. NdCo2Ge2 has two peaks in the susceptibility‐vs‐temperature curve at 13.5 and 27.5 °K. The Néel points for the heavy rare‐earth compounds follow the de Gennes function, and the equation χM = χ0,M + CM/T−θ is used to interpret the susceptabilities in the paramagnetic region. χM is the molar susceptibility; χ0,M is a temperature independent contribution to the susceptibility; CM is the Curie constant; T is the temperature and θ is the Weiss constant.

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