Abstract
The magnetic properties of sodium biscarbonatocuprate(II) trihydrate, Na2Cu(CO2)2,3H2O, have been measured in the temperature range 1.8-42 K. Magnetic susceptibility and magnetization measurements provide evidence for ferromagnetic interactions in this linear-chain compound. The magnetic susceptibility data are compatible with a Heisenberg linear chain; the best-fit parameters for the complete data set are: J 1.22 �0.04cm-1, g 2.18 � 0.01, and zJ'-0.28 � 0.02cm-l. Data in the temperature range 7-42K yield the best-fit parameters J1.37 � 0.08 cm-1, g 2.12 � 0.01, and zJ' 0.0 cm-1. The g value from this fit agrees with the g value of 2.10 obtained from a fit of the data in the temperature range 10-42 K to the Curie-Weiss law.
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