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Strontium‐based Mercury Cuprates with Perovskite‐like Crystal Structures
Author(s) -
Kuz'micheva G. M.,
Khlybov E. P.,
Kochetkov V. N.,
Palewski T.,
Warchulska J.,
Afanas'ieva I. N.
Publication year - 1995
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170300404
Subject(s) - strontium , cuprate , crystallography , perovskite (structure) , crystal structure , chemistry , electrical resistivity and conductivity , mercury (programming language) , superconductivity , mineralogy , condensed matter physics , physics , organic chemistry , quantum mechanics , computer science , programming language
Conditions of synthesis, structure, and temperatures of superconducting transitions of strontium‐based mercury cuprates Hg—Sr—Me—Cu—O (Me = Ca, La, Ce, Sm, Ho) with perovskite‐like crystal structure are described. The samples belong to two homological series: HgSr 2 (Ln, Ce) n –1 Cu n O 2 n + 2 + δ with the Hg—O bond directed along <110> and (Hg, Cu) Sr 2 Ln n –1 Cu n O 2 n + 2 + δ with the (Hg, Cu)—O bond directed along <100>. The variation of composition leads to rotation of the Hg—O bond along the hk0 direction and consequently to the increase of T c from 28 K to 81 K. An anomaly of the resistivity was observed around 200 K for most of the investigated samples, independent of their content and phase composition.