M(AsF6)2 (M = Co, Mn) AND Co(AsF6)2·2L (L = AsF3, SbF3, SO2)

Zvonko Jagličić, Janez Pirnat, Zvonko Trontelj, Janko Lužnik
Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000 Ljubljana, Slovenia
Zoran Mazej
Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia

Carlos J. Gómez-García, Eugenio Coronado
Instituto de Ciencia Molecular, Facultat de Química, Univ. de Valencia, C/ Dr. Moliner 50,46100 Burjassot (Valencia), Spain


DC magnetization measurements with a SQUID susceptometer have been performed on Mn(AsF6)2, Co(AsF6)2 and three Co(AsF6)2 compounds with different ligands (AsF3, SbF3, SO2). All samples demonstrate paramagnetic behavior above 50 K. The measured Curie constants are compatible with  Mn+2 and Co+2 ions. In addition, the samples with Co atoms show magnetic ordering below 40 K.

Investigation of arsenic NQR only in Co(AsF6)2ž2AsF3 reveals three lines: one near 122 MHz and two near 50 MHz. Relation of these spectral lines to the structure is obtained. Possible influence of paramagnetic Co is examined.