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          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 We have shown that the effective localized spin model is no longer valid for larger momentum transfer close to the zone boundary at which the spin-waves show softening.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...
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