Fundamental constraints for the mechanism of superconductivity in cuprates
Physikinstitut, Universität Zürich, Winterthurerstrasse
190, 8057 Zürich, Switzerland
Accepted: 30 November 1998
Published online: 15 February 1999
Considerable progress has been made over the last decade in understanding the phenomenological properties of the cuprate high-Tc superconductors and in producing well characterized high quality materials. Nevertheless, the pairing mechanism itself remains controversial. We establish a criterion to test theories for layered superconductors relying on a substantial interlayer contribution. The criterion is based on the ratio of the interlayer contribution to the total superfluid density, which is traced back to the inverse squared effective mass anisotropy, . γ can be measured rather accurately by various experimental techniques. It turns out that models relying on interlayer pairing cannot be considered as serious candidates for the mechanism of superconductivity in cuprate superconductors.
PACS: 74.20.-z – Theories and models of superconducting state / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999