Abstract
TlCu2O2, a mixed‐valence spin‐chain cuprate, was synthesized in a piston cylinder system starting from thallium sesquioxide Tl2O3, cuprous oxide Cu2O and copper powder. The main structural characteristics are edge‐sharing (CuO2)n zigzag chains, which are linked in the perpendicular crystallographic direction by Cu+ to form a three‐dimensional network. Data from magnetic susceptibility and specific heat measurements show features typical for low‐dimensional magnetic exchange interactions. The long‐range antiferromagnetic ordering is observed at TN = 19.7 K. No weak ferromagnetic component can be detected, suggesting a plain Néel‐type spin‐ordered structure.
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