Sound Velocity and Meissner Effect in Light-heavy Fermion Pairing Systems

Details Sound Velocity and Meissner Effect in Light-heavy Fermion Pairing Systems Sound Velocity and Meissner Effect in Light-heavy Fermion Pairing Systems

2006-03-25

arxiv.org/abs/cond-mat/0603683v3

Phys.Rev. B73 (2006) 220504

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, accepted for publication in PRB as a Rapid Communication

Scientific paper

10.1103/PhysRevB.73.220504

In the frame of a four fermion interaction theory, we investigated the collective excitation in light-heavy fermion pairing systems. When the two species of fermions posses different masses and chemical potentials but keep the same Fermi surface, we found that the sound velocity in superfluids and the Meissner mass or inverse penetration depth in superconductors have the same mass ratio dependence as the ratio of the transition temperature to the zero temperature gap.

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