Physics – Condensed Matter – Superconductivity
Scientific paper
2002-12-20
JETP Letters 77, 94 (2003)
Physics
Condensed Matter
Superconductivity
5 LaTeX pages (jetpl.sty included), 3 EPS figures. To be published in JETP Letters (January 2003)
Scientific paper
10.1134/1.1564227
Within a 2D model of Josephson junction arrays (created by 2D network of twin boundary dislocations with strain fields acting as 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-T_c superconductors are discussed.
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