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

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Page 87

After a brief review of the concepts involved I shall discuss the question of

whether correlation is a strong or a

satisfactory conclusion so I shall deal with the two alternatives . If correlation is

After a brief review of the concepts involved I shall discuss the question of

whether correlation is a strong or a

**weak**effect . This can not be brought to asatisfactory conclusion so I shall deal with the two alternatives . If correlation is

**weak**, then ...Page 171

In the limit of

average of the integrals in ( 67 ) are the « unlinked » ones in which F , F * and 1 –

nr : ( p ' ) , respectively nx " ( P ) , are averaged separately . The reason is that in ...

In the limit of

**weak**coupling the dominant terms in the evaluation of the thermalaverage of the integrals in ( 67 ) are the « unlinked » ones in which F , F * and 1 –

nr : ( p ' ) , respectively nx " ( P ) , are averaged separately . The reason is that in ...

Page 291

A + A When this situation occurs , we shall talk of a a ) b )

Fig . 8 . - Ferromagnetism : It can also happen that one half d band be - a )

b ) strong . comes completely full ( or empty ) when ńŪ , is still larger than unity ...

A + A When this situation occurs , we shall talk of a a ) b )

**weak**ferromagnetism .Fig . 8 . - Ferromagnetism : It can also happen that one half d band be - a )

**weak**;b ) strong . comes completely full ( or empty ) when ńŪ , is still larger than unity ...

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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