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

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Page 27

Whether the oneelectron levels

of quasi - particle energies ( in a many - body sense ) is a question to which

theory has no answer at present . There is , however , experimental evidence [ 15

] to ...

Whether the oneelectron levels

**represent**a good approximation to the real partsof quasi - particle energies ( in a many - body sense ) is a question to which

theory has no answer at present . There is , however , experimental evidence [ 15

] to ...

Page 249

The magnetic solutions

degenerate . This means that in this particular case the localized impurity

moment does not couple with the ferromagnetic matrix in this approximation .

When the ...

The magnetic solutions

**represent**the impurity moment and their energies aredegenerate . This means that in this particular case the localized impurity

moment does not couple with the ferromagnetic matrix in this approximation .

When the ...

Page 279

1 ) between states containing a single electron in the d - level together with an

extra band electron . It is rather convenient to

terms of time - ordered Schrödinger diagrams in which the impurity is

1 ) between states containing a single electron in the d - level together with an

extra band electron . It is rather convenient to

**represent**these matrix elements interms of time - ordered Schrödinger diagrams in which the impurity is

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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