Magnetic Excitations in Metallic Ferro- and Antiferromagnets(<Special Topic>Neutron and X-ray Scattering at the Frontiers and Gen Shirane)
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概要
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The recent twenty years have witnessed significant progress in the basic understanding of the dynamical magnetic properties in metallic and strongly correlated materials, mainly due to the progress in inelastic neutron scattering (INS) techniques and polarization analysis. One of the major achievements in this discipline is, in fact, the finding that the magnetic scattering in ferromagnetic metals shows a universal behavior independent of the itinerancy of the magnetic moment. The dynamic susceptibility in the ordered state at low temperatures is well described by spin-wave excitation. In addition, the magnetic scattering function in the paramagnetic phase above the Curie temperature, T_C, follows a simple double Lorentzian behavior in both momentum and energy. Then, the energy scale of the spin fluctuations can be expressed in terms of the ratio of the strength of the magnetic correlations defined by the molecular field Curie temperature with respect to T_C. The magnetic fluctuations in incommensurate antiferromagnets, i.e., in metallic Cr or in the high temperature superconductors of doped La_2CuO_4 compounds, show, on the other hand, a rather complicated dynamical structure factor. In contrast to ferromagnetic metals and localized antiferromagnets, the longitudinal fluctuations seem to play an important role deep in the ordered state of Cr.
- 社団法人日本物理学会の論文
- 2006-11-15
著者
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Endoh Yasuo
International Institute For Advanced Studies:institute For Materials Research Tohoku University
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Endoh Yasuo
International Institute For Advanced Studies Tohoku University
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BONI Peter
Physics Department E21, Technische Universitat Munchen
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Boni Peter
Physics Department E21 Technische Universitat Munchen
関連論文
- Magnetic Excitations in Metallic Ferro- and Antiferromagnets(Neutron and X-ray Scattering at the Frontiers and Gen Shirane)
- Preface(Neutron and X-ray Scattering at the Frontiers and Gen Shirane)
- Neutron Scattering Study of Itinerant Electron Magnet YMn_2