## Proceedings of the International School of Physics "Enrico Fermi.", Volume 37N. Zanichelli, 1967 - Nuclear physics |

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Page 47

Having so constructed a satisfactory single - particle model , we are finally in a

position to study many - body

two such

Having so constructed a satisfactory single - particle model , we are finally in a

position to study many - body

**effects**in magnetic metals . I have already indicatedtwo such

**effects**in these lectures — the vertex corrections to optical absorption ...Page 327

One finds that the exchange enhancement

cross - section at small energy loss for small angles . However , as soon as the

scattering angle is increased appreciably , the momentum transfers start to

become ...

One finds that the exchange enhancement

**effects**still show up as a peak in thecross - section at small energy loss for small angles . However , as soon as the

scattering angle is increased appreciably , the momentum transfers start to

become ...

Page 342

This is a particularly striking

ground state configuration np3 4S , should ... pure central field states neglects the

electron - electron interaction — the

configurations ...

This is a particularly striking

**effect**in the half filled p shell atoms where theground state configuration np3 4S , should ... pure central field states neglects the

electron - electron interaction — the

**effects**of which are to mix differentconfigurations ...

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### Contents

LOMER Band theory and magnetism | 1 |

JACCARINO Studies of the hyperfine interaction in transi | 39 |

P W ANDERSON and W L MCMILLAN Multiplescattering | 50 |

Copyright | |

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### Common terms and phrases

alloys amplitude analytic Anderson approximation assume average band becomes Born bound calculation complex computed condition conduction consider contribution correct correlation corresponding coupling curve defined density depends determined discussed effect electrons energy equation exchange expected expression fact factor Fermi Fermi level ferromagnetic field function given gives Hamiltonian host metal impurity atom included integral interaction interesting lattice limit localized magnetic matrix element means metals method moments momentum normal obtained occur operator orbital particle perturbation Phys physical plane polarization poles positive possible potential present problem properties range relation replaced represent resonance scattering screening Sect seems shift shown similar simple solution spin structure surface temperature theory tion transition metals usual wave wave functions write written zero