Neutron-diffraction study of the magnetic ordering in Ni(CH2CO2NH2)2

Abstract

The magnetic structure of Ni(${\mathrm{CH}}_{2}$${\mathrm{CO}}_{2}$${\mathrm{NH}}_{2}$${)}_{2}$\ensuremath{\cdot}2 ${\mathrm{H}}_{2}$O has been determined by the analysis of neutron-diffraction data from powder and single-crystal samples. Ni(${\mathrm{CH}}_{2}$${\mathrm{CO}}_{2}$${\mathrm{NH}}_{2}$${)}_{2}$\ensuremath{\cdot}2 ${\mathrm{H}}_{2}$O orders at a N\'eel temperature of 0.88 K. The magnetic structure consists of antiferromagnetically coupled layers having a canted ferromagnetic ordering within layers, with a moment of (2.33\ifmmode\pm\else\textpm\fi{}0.14)${\ensuremath{\mu}}_{B}$ per ${\mathrm{Ni}}^{2+}$ ion. The magnetic unit cell is composed of two crystallographic unit cells, and contains four nickel atoms. The moment direction is not simply related to either crystalline or molecular symmetry axes.