Magnetic Oscillations in Metals by D. Shoenberg

By D. Shoenberg

It is only over eighty years in the past impressive oscillatory box dependence used to be found within the magnetic behaviour of bismuth at low temperatures. This publication was once first released in 1984 and provides a scientific account of the character of the oscillations, of the experimental recommendations for his or her learn and in their reference to the digital constitution of the steel involved. even supposing the most emphasis is at the oscillations themselves and their many peculiarities, instead of at the conception of the digital constitution they exhibit, adequate examples are given intimately to demonstrate the type of info that has been bought and the way this knowledge has the same opinion with theoretical prediction.

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The torque experiment was just about simple enough to carry out in less than a year and, with the excellent facilities provided by the Institute, I was able to see striking oscillations within seven weeks of getting to Moscow (fig. 3). As expected, the oscillations could be followed to much lower fields than had been possible with the Faraday method* and a detailed study could be made of how the effect varied with crystal orientation, field and temperature. Once again I was lucky in having the guidance of a house theoretician.

Since Cooperstown the Fermi surfaces of nearly all the metals have been determined, some with great precision (as good as 1 in 103 in radius for copper). This has gone on in parallel with considerable advances in the techniques of band structure calculations and often the calculations and the interpretation of the dHvA data have gone hand-in­ hand. For instance the theory has produced various ways of describing Fermi surfaces specified by just a few parameters (see chapter 5) and the experiments have made it possible both to check the reliability of the scheme and to determine the values of the parameters.

The recast Schrodinger equation is in terms of a modified wavefunction (a 'pseudo-wavefunction') but has, over the range of interest, energy eigenvalues nearly identical with those of the original problem. In this way the very complicated real problem reduces to the much simpler one of solving the Schrodinger equation for a NFE model with a feeble perturbing periodic potential. Although the impulsive field technique was successful in showing up the oscillations associated with major pieces of the Fermi surfaces of polyva­ lent metals and thus paving the way for a much better understanding of their band structures, several years elapsed before the dHvA effect was discovered in any monovalent metal.

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