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VOLUME 77 (2003) | ISSUE 2 | PAGE 99
Chemomagnetism, magnetoconcentration effect and "fishtail" anomaly in chemically-induced granular superconductors
PACS: 61.72.-y, 74.25.Ha, 74.50.+r, 74.72.-h
Abstract
Within a 2D model of Josephson junction arrays (created by 2D network of twin boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals), a few novel effects expected to occur in intrinsically granular material are predicted including: (i) Josephson chemomagnetism (chemically induced magnetic moment in zero applied magnetic field) and its influence on a low-field magnetization (chemically induced paramagnetic Meissner effect), and (ii) magnetoconcentration effect (creation of oxygen vacancies in applied magnetic field) and its influence on a high-field magnetization (chemically induced analog of "fishtail" anomaly). The conditions under which these effects can be experimentally measured in non-stoichiometric high-Tc superconductors are discussed.