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We have performed inelastic magnetic neutron scattering experiments onLa(2-x-y)Sr(x)Nd(y)CuO(4) in order to study the Nd 4f-spin dynamics at lowenergies. In all samples we find at high temperatures a quasielastic line(Lorentzian) with a line width which decreases on lowering the temperature. Thetemperature dependence of the quasielastic line width Gamma/2(T) can beexplained with an Orbach-process, i.e. a relaxation via the coupling betweencrystal field excitations and phonons. At low temperatures the Nd-4f magneticresponse S(Q,omega) correlates with the electronic properties of theCuO(2)-layers. In the insulator La(2-y)Nd(y)CuO(4) the quasielastic linevanishes below 80 K and an inelastic excitation occurs. This directly indicatesthe splitting of the Nd3+ ground state Kramers doublet due to the staticantiferromagnetic order of the Cu moments. In La(1.7-x)Sr(x)Nd(0.3)CuO(4) withx = 0.12, 0.15 and La(1.4-x)Sr(x)Nd(0.6)CuO(4) with x = 0.1, 0.12, 0.15, 0.18superconductivity is strongly suppressed. In these compounds we observe atemperature independent broad quasielastic line of Gaussian shape below T about30 K. This suggests a distribution of various internal fields on different Ndsites and is interpreted in the frame of the stripe model. InLa(1.8-y)Sr(0.2)Nd(y)CuO(4) (y = 0.3, 0.6) such a quasielastic broadening isnot observed even at lowest temperature.Comment: 8 pages, 10 figures included, to appear in Phys. Rev.

physical review. b, condensed matter

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4f-spin dynamics inLa2−x−ySr