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Quantum spin dynamics of the bilayer ferromagnet La Sr Mn O |
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| Authors: | N Shannon T Chatterji F Ouchni P Thalmeier |
| Institution: | Max-Planck-Institut für Physik komplexer Systeme, N?thnitzer Str. 38, 01187 Dresden, Germany, DE Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France, FR Institut für Theoretische Physik III, Universit?t Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany, DE Max-Planck-Institut für Chemische Physik fester Stoffe, N?thnitzer Str. 40, 01187 Dresden, Germany, DE |
| Abstract: | We construct a theory of spin wave excitations in the bilayer manganite La1.2Sr1.8Mn2O7 based on the simplest possible double-exchange model, but including leading quantum corrections to the spin wave dispersion and damping. Comparison is made with recent inelastic neutron scattering experiments. We find that quantum effects account for some part of the measured damping of spin waves, but cannot by themselves explain the observed softening of spin waves at the zone boundary. Furthermore a doping dependence of the total spin wave dispersion and the optical spin wave gap is predicted. Received 15 January 2002 Published online 6 June 2002 |
| Keywords: | PACS 75 30 DS Spin waves – 75 25 +z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies synchrotron-source X-ray scattering etc ) |
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