Abstract
The layered A-type antiferromagnet Pr0.5Sr0.5MnO3 has been investigated by neutron scattering. Antiferromagnetic ordering is observed with a TN of 152.3 K and an exponent β of 0.148±0.01 that suggests 2d Ising behavior. The spin-wave excitations, measured for the neutron momentum transfer q perpendicular to the ferromagnetic planes at 2 K, show a gap of 2.3±0.2 meV at the zone center [0.5 0 0.5]. The dispersion near zone center yielded the spin-wave stiffness coefficient DSW of ∼100±10 meV Å2 which is twice the value found in the isostructural A-type antiferromagnet LaMnO3. The double-exchange interaction, introduced by hole doping, enhances DSW in Pr0.5Sr0.5MnO3. The spin wave dispersion at low q fits the dispersion of the Heisenberg model with nearest neighbor exchange interaction and single ion anisotropy.
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