By D. Wagner and D. ter Haar (Auth.)

The current publication comprises primarily the fabric of a lecture sequence at the conception of magnetism, which was once held for college kids of physics at a medium complex point. The set-up follows the average subdivision of magnetic ingredients, i.e. diamagnetism was once taken care of first, then paramagnetism, and eventually ee handled ferromagnetism, antiferromagnetism and ferrimegnetism. certainly a few components of this box, magnetism, needed to be handled in much less element than different components, because the quantity of the booklet was once restricted. therefore within the first a part of the publication we've positioned emphasis at the de Hassv-van Alpen influence, which iw very instructive as to the habit of electrons in crystals. within the moment half the effect of the crystal box on tha paramagnetism of atoms and attached difficulties (Kramers theorem, adiabatic demagnetization, paramagnetism resonance, ...) were handled extra widely

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**Sample text**

If the medium has a di48 h DIAMAGNETISM electric constant ε and permeability /^,the Maxwell equations will read cmlE = -^H, cmlH = —g+-É, c ^ c or, after eliminating H, curlcurl£ = - f (^¿+£). In addition to them we have the expression for the conduction current g = nev and eqn. 47) without the collision term, which is unimportant for this problem. These equations determine the possible waves propagated in the medium and its refractive index. We are interested only in those waves which are polarised at right angles to the magnetic field, as only these waves can be influenced by the magnetic field.

If we assume, for example, that the conduction electrons are bound relatively strongly to the lattic atoms, the M^(r) will behave approximately like an atomic eigenfunction in the immediate proximity of an atom (tight-binding approximation; see Wilson, 1958). It is easy to verify that this corresponds to a large ejffective mass (see also Mott and Jones, 1936; Sachs, 1963), as is obvious, since stronger binding corresponds to lower electron mobil ity. 37). 7) for the diamagnetism of atoms. The Landau diamagnetism can therefore be considered only a first term of a series expansion for the exact formula (Wilson, 1958; Kjeldaas and Kohn, 1957).

In a plane perpen dicular to the latter, they move along circular orbits with radius r = νΙω^ = 10"3 cm. These electrons are therefore only for a very short time in the skin layer in which a microwave field perpendicular to the magnetic field can act upon them. , since in the time in which the microwave field is not in phase with the electrons, these electrons are inside the metal, far below the skin depth. Cyclotron resonance in metals is thus charac terised by an appearance of resonance absorption at ω = ηω^\ η = 1, 2, 3, .