MAGNETIC-PROPERTIES OF ND3+ IN ND-BA-CU-O-COMPOUNDS

Neutron diffraction, neutron spectroscopy and magnetization measurements have been employed to study the structural, electronic, and magnetic behavior of eleven compounds with the general formula Nd1+yCavBa2-y-vCu3Ox (0 less-than-or-equal-to y less-than-or-equal-to 0.5; 0 less-than-or-equal-to v less-than-or-equal-to 0.25; 6 less-than-or-equal-to x less-than-or-equal-to 7). The structure turned out to react to oxygen reduction similar as other 123-compounds, yielding discontinuities close to the metal-insulator-transition and the well-known relations of bond lengths as a function of T(c). The crystalline electric field (CEF) interaction, splitting the 10-fold degenerate ground-state J-multiplet of the Nd3+-ions into five doublet states, was investigated by neutron spectroscopy. The derived CEF parameters have been used to determine changes in the electronic surroundings of the Nd3+ ions. In addition, with the help of the CEF parameters the thermodynamic magnetic properties of these compounds were calculated which turn out to be in good agreement with the experimental data.