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

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Page 107

The energy has zero imaginary part in this approximation , whereas clearly the

presence of disorder

system is not made up of identical sites each with an average scattering effect ...

The energy has zero imaginary part in this approximation , whereas clearly the

presence of disorder

**means**that the pseudo - particles have a finite lifetime . Thesystem is not made up of identical sites each with an average scattering effect ...

Page 122

ABRIKOSOV [ 3 ] attacked the problem by

order perturbation theory to encompass interactions such as H , NAGAOKA [ 4 , 5

] attempted the equations of motion technique for Green ' s functions , truncating ...

ABRIKOSOV [ 3 ] attacked the problem by

**means**of an adaptation of infinite -order perturbation theory to encompass interactions such as H , NAGAOKA [ 4 , 5

] attempted the equations of motion technique for Green ' s functions , truncating ...

Page 128

If only fermion and boson operators were involved in the problem , one would

reduce the terms of the series into diagrams by

difficulty with the present problem is that no comparably simple and effective ...

If only fermion and boson operators were involved in the problem , one would

reduce the terms of the series into diagrams by

**means**of Wick ' s theorem . Thedifficulty with the present problem is that no comparably simple and effective ...

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### Contents

LOMER Band theory and magnetism | 1 |

PHILLIPS Band theory of transition metals | 22 |

JACCARINO Studies of the hyperfine interaction in transi | 39 |

Copyright | |

19 other sections not shown

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### Common terms and phrases

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