## Frontiera E Confini Della Fisica Di Molte ParticelleR. A. Broglia, John Robert Schrieffer, Società italiana di fisica Subjects at the forefront of many-particle research, like high-temperature superconductivity, the quantum Hall effect, heavy fermions, tunneling of quantal systems with many degrees of freedom, Monte Carlo calculations on a lattice etc., were presented. The meeting was well timed as it coincided with a very active period of research in the study of superconductivity and thus provided an excellent opportunity to assess some of the major developments that have taken place in the last years. |

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Page 213

Each nuclear spin in its lattice site preces- sing with a Larmor

determined by the external magnetic field B0 is the analog of a

The whole crystal at a given temperature, and with the maguetic-dipole

interaction ...

Each nuclear spin in its lattice site preces- sing with a Larmor

**frequency**determined by the external magnetic field B0 is the analog of a

**rotational**band.The whole crystal at a given temperature, and with the maguetic-dipole

interaction ...

Page 247

28 the aligned angular momentum, i, for this pair (measured by the difference 12

-4 1 , , , I 0 0.1 0.2 0.3 0.4 u(MeV) Pig. 28. - The aligned angular momentum, i, is

plotted against

28 the aligned angular momentum, i, for this pair (measured by the difference 12

-4 1 , , , I 0 0.1 0.2 0.3 0.4 u(MeV) Pig. 28. - The aligned angular momentum, i, is

plotted against

**rotational frequency**, a>, for the first backbend alignment) region ...Page 257

For

BCS gap becomes zero, the pairing contribution to the ground-state energy is

proportional to the square of the number of particles. That is, 2*7,, ~ GN2, typical

of a ...

For

**rotational frequencies**co smaller than the critical frequency coc, where theBCS gap becomes zero, the pairing contribution to the ground-state energy is

proportional to the square of the number of particles. That is, 2*7,, ~ GN2, typical

of a ...

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### Contents

insula | 1 |

EVB theory such as it is | 14 |

Formal theories of EVB and highT0 superconductivity | 20 |

Copyright | |

21 other sections not shown

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### Common terms and phrases

amplitude angular momentum approximation band barrier behavior calculated charge classical configuration correlation Coulomb coupling cross-section defined deformation degrees of freedom density described dipole discussed dynamics edited effect eigenstates electron equation of motion excitation energy exciton expectation value experimental factor Fermi energy Fermi liquid Fermi surface fermion finite fluctuations gauge given Green's function Gutzwiller Hamiltonian Hartree heavy-ion hole Hubbard model inertia interaction Landau lattice Laughlin Lett limit linear magnetic field mass matrix element mean-field Monte Carlo neutrons nuclear nucleon nucleus obtained orbital oscillator P. W. ANDERSON pairing parameter particle path integral phase Phys physics potential problem quadrupole quantity quantum quasi-particle R. A. BROGLIA relativistic renormalized resonance rotational frequency sect shown in fig simulation single-particle spin spinon superconductivity symmetry temperature term theory tion tonian transition tunnelling variable vector wave function yrast zero