Single-Site Functional-Integral Approach to Itinerant-Electron Ferromagnetism

作者: Hideo Hasegawa

DOI: 10.1143/JPSJ.46.1504

关键词: ParamagnetismFerromagnetismMagnetic momentElectronDensity of statesSpin-½Condensed matter physicsPhysicsTransition metalAtomGeneral Physics and Astronomy

摘要: Itinerant-electron ferromagnetism at finite temperatures is discussed by using the functional-integral method with two fields within static and saddle-point approximations combined single-site approximation; a single atom of pure metal regarded as an impurity embedded in host which treated kind alloy-analogy approximation. The amplitude local magnetic moment shown to have weak temperature dependence remain even paramagnetic state, where spin susceptibility obeys approximate Curie-Weiss law. Numerical calculations are made use simplified model for density states bcc transition metals. Calculated results reference experimental data iron.

参考文章(31)
P. W. Anderson, Localized Magnetic States in Metals Physical Review. ,vol. 124, pp. 41- 53 ,(1961) , 10.1103/PHYSREV.124.41
Tôru Moriya, Ferro- and Antiferromagnetism of Transition Metals and Alloys Progress of Theoretical Physics. ,vol. 33, pp. 157- 183 ,(1965) , 10.1143/PTP.33.157
M F Collins, A MEASUREMENT BY NEUTRON SCATTERING OF MAGNETIC MOMENTS IN A PARAMAGNETIC IRON-NICKEL ALLOY Proceedings of the Physical Society. ,vol. 86, pp. 973- 976 ,(1965) , 10.1088/0370-1328/86/5/308
V. Korenman, J. L. Murray, R. E. Prange, Local-band theory of itinerant ferromagnetism. I. Fermi-liquid theory Physical Review B. ,vol. 16, pp. 4032- 4047 ,(1977) , 10.1103/PHYSREVB.16.4032
L-G Petersson, R Melander, DP Spears, SBM Hagström, None, Density of states of ferromagnetic and paramagnetic Ni and Fe studied by photoelectron spectroscopy with 21.2- and 40.8-eV photon energies Physical Review B. ,vol. 14, pp. 4177- 4183 ,(1976) , 10.1103/PHYSREVB.14.4177
D. E. Eastman, F. J. Himpsel, J. A. Knapp, Experimental Band Structure and Temperature-Dependent Magnetic Exchange Splitting of Nickel Using Angle-Resolved Photoemission Physical Review Letters. ,vol. 40, pp. 1514- 1517 ,(1978) , 10.1103/PHYSREVLETT.40.1514
Masahiko Sakoh, Masao Shimizu, Temperature Variation of Localized Spin and Phase Transition in Half-Filled Hubbard Band Journal of the Physical Society of Japan. ,vol. 40, pp. 974- 980 ,(1976) , 10.1143/JPSJ.40.974
Tôru Moriya, Yoshinori Takahashi, Spin Fluctuation Theory of Itinerant Electron Ferromagnetism –A Unified Picture Journal of the Physical Society of Japan. ,vol. 45, pp. 397- 408 ,(1978) , 10.1143/JPSJ.45.397
S. H. Liu, Quasispin model of itinerant magnetism: High-temperature theory Physical Review B. ,vol. 15, pp. 4281- 4287 ,(1977) , 10.1103/PHYSREVB.15.4281
The paramagnetism of the ferromagnetic elements Proceedings of The Royal Society A: Mathematical, Physical and Engineering Sciences. ,vol. 167, pp. 189- 204 ,(1938) , 10.1098/RSPA.1938.0126