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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	Institute: MPI für Physik Komplexer Systeme     Collection: Superconductivity and magnetism     Display Documents ID: 478516.0, MPI für Physik Komplexer Systeme / Superconductivity and magnetism Spin dynamics of La0.7Ba0.3MnO3 Authors: Chatterji, T.; Regnault, L. P.; Schmidt, W. Language: English Date of Publication (YYYY-MM-DD): 2002-12-01 Title of Journal: Physical Review B Journal Abbrev.: Phys. Rev. B Volume: 66 Issue / Number: 21 Sequence Number of Article: 214408 Review Status: Peer-review Audience: Not Specified Abstract / Description: We have done inelastic neutron scattering investigations of the magnetic excitations in the ferromagnetic La0.7Ba0.3MnO3 which shows colossal magnetoresistance (CMR) behavior close to T(C)approximate to350 K. We have measured the dispersions of the spin waves along [100] and [110] and also their temperature dependence. We have fitted the dispersions with an effective localized spin model to get the nearest-neighbor exchange interaction. We have shown that the effective localized spin model is no longer valid for larger momentum transfer close to the zone boundary at which the spin-waves show softening. Also the spin-wave energy widths are found to be much larger than the instrumental resolution. We argue that the spin-wave softening and damping are generic to the double-exchange ferromagnet including those with large T-C. External Publication Status: published Document Type: Article Communicated by: Heidrun Näther Affiliations: MPI für Physik Komplexer Systeme/Visitors Program External Affiliations: Inst Max Von Laue Paul Langevin, BP 156, F-38042 Grenoble 9,; France; Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France; Max Planck Inst Phys Komplexer Syst, Dresden, Germany; CEN, DRFMC, SPSMS MDN, F-38054 Grenoble, France; KFA Julich GmbH, Forschungszentrum, Inst Festkorperforsch, D-5170 Julich, Germany Identifiers: ISI:000180318800063 ISSN:1098-0121 URL:http://ojps.aip.org/getabs/servlet/GetabsServlet?p... The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.