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

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

The attention-grabbing phenomenon ferromagnetism is way from being totally understood, even though it without doubt belongs to the oldest difficulties of sturdy nation physics. For any research apparently recommendable to differentiate among fabrics whose spontaneous magnetization stems from localized electrons of ?lled atomic shell and people within which it's because 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 notable growth that has lately been made in the direction of a microscopic knowing of band-ferromagnetism as an electron c- relation e?ect. The authors of a few of the chapters of this e-book “Band-Ferromagnetism: Ground-State and Finite-Temperature Phenomena” participated as chosen - perts within the 242nd WE-Heraeus-Seminar (4-6 October 2000) held less than nearly a similar identify in Wandlitz close to Berlin (Germany). It used to be the second one seminar of this sort in Wandlitz. (The ?rst in 1998 handled the complementary subject of the physics of local-moment ferromagnets comparable to Gd). Twenty-six invited spe- ers from ten di?erent nations including ?fty-?ve additional members, who provided contributions in kind of posters, spent 3 days jointly discussing in an enthusiastic and fertile demeanour the recent issues of band-ferromagnetism.

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J. Rehr, K. Baberschke: Phys Rev. A. D¨ urr Institut f¨ ur Festk¨ orperforschung, Forschungszentrum J¨ ulich, 52425 J¨ ulich, Germany Abstract. The description of the itinerant ferromagnetic ground state in terms of a bandstructure approach has been very successful in providing detailed information about valence-band exchange splitting, quasiparticle effects, etc. An alternative picture is the expansion of electronic and magnetic ground-state properties into multipole moments. Vector moments such as orbital and spin magnetic moments are their best-known representatives.

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G. with M||ε. We will demonstrate in the following how λa can be measured directly with XRMS. 3 The X-Ray Resonant Magnetic Scattering Amplitude The scattering signal measured in a diffraction experiment, I ∝ | n e(iq·rn ) fn |2 (where q is the wavevector transfered in the scattering process), is the modulus square of the sum over all lattice sites, rn , of the scattering amplitudes, fn , weighted by a phase factor. In this chapter we will review how to derive the resonant scattering amplitude and describe its relation to ground-state properties.

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