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Magnetic Susceptibilities of Several Salts at Liquid-He3 Temperatures

1964; American Institute of Physics; Volume: 35; Issue: 3 Linguagem: Inglês

10.1063/1.1713350

1520-8850

S. A. Friedberg, J. T. Schriempf,

Theoretical and Computational Physics

The magnetic susceptibilities of several compounds have been measured between 0.35° and 4.2°K in a He3 cryostat by an audiofrequency mutual-inductance technique. The powder susceptibility of [Cr3(CH3COO)6(OH)2]Cl·8H2O obeys a Curie—Weiss law. Powder data show Co(CH3COO)2·4H2O and Ni(CH3COO)2·4H2O to be paramagnetic down to 0.35°K; the cobaltous salt does not exhibit the anomaly at 0.6°K inferred earlier from adiabatic demagnetization data. The powder susceptibility of Mn(HCOO)2·2H2O departs from Curie—Weiss behavior at these temperatures due to exchange interaction among many of the Mn+ +'s. Powder and single-crystal data on FeCl2·4H2O indicate antiferromagnetic behavior with a Néel point TN∼1°K and preferred spin alignment along or near the monoclinic b axis. The susceptibilities above TN have been analyzed in terms of the energy levels of a single Fe++ ion and the large anisotropy given a reasonable interpretation.