By K. W. H. Stevens (auth.), Jan T. Łopuszański, Andrzej Pękalski, Jerzy Przystawa (eds.)
The court cases awarded the following comprise the notes of lectures added throughout the 11th iciness college of Theoretical Physics, held at Karpacz, Poland, February 19 - March four, 1974. the varsity used to be essentially dedicated to new innovations within the thought of magnetism in metals, alloys, and metal compounds, yet, as could be visible from the desk of contents of the e-book, different issues of the speculation of magnetism have been additionally mentioned during the lec tures. The organizers agreed to this sort of broadening of the scope for you to fulfill specific requests from the Polish members for whose profit the varsity used to be equipped. those "local" pursuits are basically mirrored within the court cases and are answerable for a definite inhomogeneity of the themes chosen for presentation. however, we've got a robust wish that those fabrics should be fascinating to many physicists, not just in Poland, for the topics mentioned listed here are very important not just at the neighborhood point, because the lectures include really clean, unpublished effects or very good up to-date experiences. the 1st a part of the amount includes lectures without delay cor responding to the identify of the college, i.e., chosen issues of the speculation of steel magnetism, with moderate bias towards infrequent earth and actinide metals and their compounds. within the moment part we now have gathered the themes extra loosely hooked up with the most flow, similar to statistical and thermodynamic points of assorted versions, spin-phonon interplay, and others.
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Extra info for Magnetism in Metals and Metallic Compounds
5, it is dPA/dzsd ~ 1 ~B. Any theory of itinerant electron ferromagnetism must be able to predict this curve. 5 Cr Mn Fe 24 25 26 Co 27 Ni Cu 28 29 ELECTRONS PER ATOM Figure 9 - Average atomic moment vs outer electron/atom ratio for first-row transition elements and their alloys. CONCEPTUAL PHASE DIAGRAMS 53 induced by the molecular field. 1. 0, and small deviations from this value are obscured by uncertainties in the parameter ns. 0. Because the 48 band is broad relative to the 3d bands, we do not anticipate large changes in ns on passing through a phase change.
7. I. M. (1960). Fiz. Tverd. Tela, 2, 2821. 8. I. L. (1972). Phys. Rev. , 28, 1077. CONCEPTUAL PHASE DIAGRAMS AND THEIR APPLICATIONS TO ITINERANT ELECTRON MAGNETISMt JOHN B. GOODENOUGH Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02173, USA 1. INTRODUCTION An adequate description of the magnetic properties of a solid requires not only a knowledge of the relative energies of the atomic outer-electron states, but also the location of a given electron state within a conceptual phase diagram of electronic properties.
In the narrow-band limit U» Wr" the single atom ground configuration dn is separated from the dn+l ground level by an energy U, as shown in figures 2(a,b). _ ---) ----1-. ,. - N(E)- N(E)- (0) b bg Figure 2 - Energy density of states N(E) vs energy for a half-filled d band for four different values of the nearest neighbour transfer energy integral b. Small-polaron activation energy is Ea. CONCEPTUAL PHASE DIAGRAMS 41 excited-state energies are not shown in figure 2.