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Quantum Spin‐1/2 Dimers in a Low‐Dimensional Tetrabromocuprate Magnet
Author(s) -
Sampson Gavin,
Bristowe Nicholas C.,
Carr Sam T.,
Saib Asad,
Stenning Gavin B. G.,
Clark Ewan R.,
Saines Paul J.
Publication year - 2022
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202200855
Subject(s) - antiferromagnetism , condensed matter physics , ferromagnetism , bilayer , spin (aerodynamics) , coupling (piping) , copper , magnet , physics , materials science , chemistry , quantum mechanics , biochemistry , membrane , metallurgy , thermodynamics
This work describes a homometallic spin‐ 1 / 2 tetrabromocuprate adopting a bilayer structure. Magnetic‐susceptibility measurements show a broad maximum centred near 70 K, with fits to this data using a Heisenberg model consistent with strong antiferromagnetic coupling between neighbouring copper atoms in different layers of the bilayer. There are further weak intralayer ferromagnetic interactions between copper cations in neighbouring dimers. First‐principles calculations are consistent with this, but suggest there is only significant magnetic coupling within one direction of a layer; this would suggest the presence of a spin ladder within the bilayer with antiferromagnetic rung and weaker ferromagnetic rail couplings.