Electron (Hole) Liquids Flowing Through Both Heavy Fermion and Cuprate Materials in Superconducting and Normal States

Abstract

In earlier work, we have considered electron (hole) liquids flowing through assemblies with antiferromagnetic fluctuations in the normal state of high-Tc cuprates. The present review has as its focus to compare and contrast these high-Tc cuprates with heavy Fermion superconductors. Both classes of materials will be considered in superconducting as well as in normal phases. In the former phase, a further focal point will be the symmetry of the pairing. In underdoped cuprates with d-wave symmetry, evidence continues to mount for preformed (2e) Bosons in the normal state, especially from neutron scattering experiments. This is in marked contrast to the heavy Fermion material UBe₁₃, where very recent differential conductivity measurements on a UBe₁₃-Au junction appear to exclude the formation of such precursor Bosons.

Key Words:

• Non-s-wave pairing superconductors
• Heavy Fermion materials
• High-Tc cuprates