Comparative study of the characteristic length scales and fields of Hg-based high-Tc superconductors

Abstract

The equilibrium magnetization was studied in magnetically aligned Hg-based cuprate superconductors with a crystal structure containing one, two, and three adjacent Cu-O layers. The mixed state magnetization was measured with the magnetic field applied perpendicular to the layers, along with low field Meissner effect and normal state susceptibility studies for volume correction factors. The internally consistent analysis is used to identify systematics as the number ‘‘n’’ of Cu-O layers increases. The study reveals a linear increase in the slope of upper critical field -dHc2/dT with ‘‘n’’. Most importantly, we find a nearly constant carrier doping per Cu-O layer. This result is compared with other studies, e.g., Rietveld analysis of neutron diffractometry, and its implications are discussed. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

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