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Within a 2D model of Josephson junction arrays (created by 2D network of twinboundary dislocations with strain fields acting as insulating barrier betweenhole-rich domains in underdoped crystals), a few novel effects expected tooccur in intrinsically granular material are predicted including: (i) Josephsonchemomagnetism (chemically induced magnetic moment in zero applied magneticfield) and its influence on a low-field magnetization (chemically inducedparamagnetic Meissner effect), and (ii) magnetoconcentration effect (creationof oxygen vacancies in applied magnetic field) and its influence on ahigh-field magnetization (chemically induced analog of "fishtail" anomaly). Theconditions under which these effects can be experimentally measured innon-stoichiometric high-T_c superconductors are discussed.Comment: 5 LaTeX pages (jetpl.sty included), 3 EPS figures. To be published in  JETP Letters (January 2003

Chemomagnetism, magnetoconcentration effect, and “fishtail” anomaly in chemically induced granular superconductors