Band-Ferromagnetism by K. Baberschke, M. Donath, W. Nolting

By K. Baberschke, M. Donath, W. Nolting

The attention-grabbing phenomenon ferromagnetism is much from being absolutely understood, even though it absolutely belongs to the oldest difficulties of sturdy nation physics. For any research it seems that recommendable to differentiate among fabrics whose spontaneous magnetization stems from localized electrons of ?lled atomic shell and people during which it's as a result of itinerant electrons of ?lled conduction band. within the latter case one speaks of band-ferromagnetism, prototypes of that are the classical ferromagnets Fe, Co, and Ni. the current e-book is a standing record at the awesome growth that has lately been made in the direction of a microscopic realizing of band-ferromagnetism as an electron c- relation e?ect. The authors of a number of the chapters of this booklet “Band-Ferromagnetism: Ground-State and Finite-Temperature Phenomena” participated as chosen - perts within the 242nd WE-Heraeus-Seminar (4-6 October 2000) held lower than nearly an analogous identify in Wandlitz close to Berlin (Germany). It was once the second one seminar of this kind in Wandlitz. (The ?rst in 1998 handled the complementary subject of the physics of local-moment ferromagnets corresponding to Gd). Twenty-six invited spe- ers from ten di?erent nations including ?fty-?ve extra contributors, who awarded contributions in type of posters, spent 3 days jointly discussing in an enthusiastic and fertile demeanour the recent issues of band-ferromagnetism.

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Maki, Phys. Rev. B 31, 6633 (1985); D. Baeriswyl, J. Carmelo, and K. Maki, Synth. Met. 21, 271 (1987). 18. D. Vollhardt, Rev. Mod. Phys. 56, 99 (1984). 19. A. C. Gutzwiller J. Appl. Phys. A. Chao, Phys. Rev. B 4 4034 (1971); ibid. 1088 (1973); J. Phys. C 7 127 (1974). 20. P. Fazekas, Lecture Notes on Electron Correlation and Magnetism, Series in Mod. Cond. Matt. Phys. 5 (World Scientific, Singapore, 1999), gives an introduction to the theory of ferromagnetism, and a concise description and some applications of the Gutzwiller approximation.

Farle, W. Platow, A. Anisimov, B. Schulz, K. Baberschke: J. Magn. Magn. Mater. 165, 74 (1997) 38. M. Farle: Rep. Prog. Phys. 61, 755 (1998) 39. A. N. Anisimov, W. Platow, P. Poulopoulos, W Wisny, M Farle, K. Baberschke, P. Isberg, B Hj¨ orvarsson, R. W¨ appling: J. : Condens. Matter 9, 10581 (1997) 40. D. K. Wohlleben, B. R. Coles in vol. 5 of ref. 15 and references therein 41. Y. Li, K. Baberschke: Phys. Rev. Lett. 68, 1208 (1992) 42. P. Bruno: Phys. Rev. B 39, 865 (1989) 43. A. N. Anisimov, M.

54], and the discussion of this problem in Ref. [55]. The balance between 4sp and 3d electrons is the more influenced the larger the exchange splitting fields are because the minority band 3d level is shifted towards the 4s, 4p levels and the majority band 3d level is shifted away. Only in first order of the splitting energy, we can expect that no change in the overall 4s, 4p population happens, as is imposed by the choice of our 4s, 4p chemical potentials. Presently, the flow between 4s, 4p and 3d electrons cannot be described with our model Hamiltonian as the electron-electron interaction within the 4s, 4p shell and between 4sp and 3d is not included.

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