Abstract
Strongly Ce doped Nd 2− x Ce x CuO 4 exhibits heavy-fermion like behavior due to a supposed 4f–3d electron hybridization. The magnetic response seen by inelastic neutron scattering can be divided into contributions from correlated Nd 3+ spins, reminiscent of the spin waves in undoped Nd 2CuO 4, and from independent, slowly relaxing Nd 3+ spins. By applying a magnetic field along [0 1 0] the quasi-elastic scattering disappears and a transition into a partially aligned phase is generated at about 3.7 T. The critical field corresponds to the re-appearance of the Schottky peak in the specific heat. Elastic measurements confirm the low-dimensional character of the magnetic structure of the highly Ce doped compound and suggest a change of the spin structure compared to Nd 2CuO 4.
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