MAGNETIC-PROPERTIES OF ND3-BA-CU-O-COMPOUNDS( IN ND)

Neutron diffraction, neutron spectroscopy and magnetization measuremen ts have been employed to study the structural, electronic, and magneti c 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-th an-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 cl ose to the metal-insulator-transition and the well-known relations of bond lengths as a function of T(c). The crystalline electric field (CE F) interaction, splitting the 10-fold degenerate ground-state J-multip let of the Nd3+-ions into five doublet states, was investigated by neu tron spectroscopy. The derived CEF parameters have been used to determ ine changes in the electronic surroundings of the Nd3+ ions. In additi on, with the help of the CEF parameters the thermodynamic magnetic pro perties of these compounds were calculated which turn out to be in goo d agreement with the experimental data.