Paramagnetic Meissner effect and time reversal non-invariance from spin polarization

✍ Scribed by Alpo Kallio; Victor Sverdlov; Martti Rytivaara

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 162 KB
• Volume: 21
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0422

✦ Synopsis

We propose that recent experiments on the paramagnetic Meissner effect can be understood in terms of pairing fermion (quasiparticle) spin polarization. The polarization comes from the fact that for Coulomb Fermi systems the polarized state has lower energy than the unpolarized state due to the Coulomb interactions when the fermion density is small. With suitable surface topology the polarized spins cannot be screened by supercurrents inside a surface layer. The same theory explains also the double transition in U Pt 3 and the observed breakdown of time reversal invariance associated with polarized spins. The low temperature Schottky effects seen in high-T c cases are also proposed to be caused by the polarization.