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

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Page 429

where Ek is the single quasi - particle energy in the

change in o away from its

representing the quasi - particle interaction ( 73 ) < lt | 0 ( ks , k ' s ' ) | l ' t ' ) = = 8k

+ 15 + r ...

where Ek is the single quasi - particle energy in the

**normal**state , g1 is thechange in o away from its

**normal**value , and O is the two - particle operatorrepresenting the quasi - particle interaction ( 73 ) < lt | 0 ( ks , k ' s ' ) | l ' t ' ) = = 8k

+ 15 + r ...

Page 430

of ( 76 ) implies that the SDW state exists and is degenerate with the

. The relative strenght of vp increases with ry , the radius of the WignerSeitz

sphere . For r , = 0 , only the trivial solution A = 0 exists , corresponding to the ...

of ( 76 ) implies that the SDW state exists and is degenerate with the

**normal**state. The relative strenght of vp increases with ry , the radius of the WignerSeitz

sphere . For r , = 0 , only the trivial solution A = 0 exists , corresponding to the ...

Page 444

troduced by BARDEEN , COOPER and SCHRIEFFER [ 85 ] ( BCS ) in 1957 was

the notion that if V < 0 , the

the spontaneous formation of bound pairs ( Cooper pairs ) of quasi - particles of ...

troduced by BARDEEN , COOPER and SCHRIEFFER [ 85 ] ( BCS ) in 1957 was

the notion that if V < 0 , the

**normal**metallic state would become unstable againstthe spontaneous formation of bound pairs ( Cooper pairs ) of quasi - particles of ...

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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 | |

25 other sections not shown

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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