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

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Page 18

Formal and rigorous proofs of S . D . W . instability of the perfect electron gas in

the unscreened

OVERHAUSER . The further analysis of the problem ( like the ferromagnetic

problem ) ...

Formal and rigorous proofs of S . D . W . instability of the perfect electron gas in

the unscreened

**exchange**Hartree - Fock approximation have been given byOVERHAUSER . The further analysis of the problem ( like the ferromagnetic

problem ) ...

Page 87

I shall outline an estimate of this , though again no definite answer can be given .

I shall then present a discussion due to KANAMORI [ 2 ] showing that large

order of ...

I shall outline an estimate of this , though again no definite answer can be given .

I shall then present a discussion due to KANAMORI [ 2 ] showing that large

**exchange**( or Coulomb ) energies are reduced by correlation to a size of theorder of ...

Page 88

The

potential energy of the system is lowered by increasing the number of like spins .

The correlation effect , by reducing the Coulomb energy of unlike spins , usually

acts ...

The

**exchange**terms in general have ferromagnetic tendencies since thepotential energy of the system is lowered by increasing the number of like spins .

The correlation effect , by reducing the Coulomb energy of unlike spins , usually

acts ...

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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