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

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Page 142

**Poles**of the s - matrix . - The analytic properties of s , P2 ( k ) Pil- k ) ? may be inferred from those of pilk ) . Since p ( k ) is analytic in Im k < u ...Page 177

**Poles**on the physical sheet are not admissible ( except for 2 real and < -E ) , not only according to the discussion of Sect .Page 182

Analytic continuation across Tc . Equation ( 97 ) shows that for T > T . , F ( x ) has a whole series of

Analytic continuation across Tc . Equation ( 97 ) shows that for T > T . , F ( x ) has a whole series of

**poles**in the unphysical sheet .### What people are saying - Write a review

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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