Low-spin S = [1/2] ground state of the Cu trimers in the paper-chain compound Ba sub(3)Cu sub(3)In sub(4)O sub(12)

The magnetic ground states of the isostructural paper-chain compounds Ba[sub 3]Cu[sub 3]In[sub 4]O[sub 12] and Ba[sub 3]Cu[sub 3]Sc[sub 4]O[sub 12] were recently found to be ordered anti-ferromagnetically (AFM), while both quantum magnets reveal positive asymptotic Curie-Weiss temperatures suggestiv...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-10, Vol.86 (15)
Main Authors: Gippius, A A, Gervits, N E, Tkachev, A V, Maslova, I S, Volkova, O S, Vasiliev, A N, Buttgen, N, Kraetschmer, W, Moskvin, A S
Format: Article
Language:English
Subjects:
Asymptotic properties
Condensed matter
Ferromagnetism
Ground state
Grounds
Magnetic fields
Saturation (magnetic)
Trimers
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Summary:The magnetic ground states of the isostructural paper-chain compounds Ba[sub 3]Cu[sub 3]In[sub 4]O[sub 12] and Ba[sub 3]Cu[sub 3]Sc[sub 4]O[sub 12] were recently found to be ordered anti-ferromagnetically (AFM), while both quantum magnets reveal positive asymptotic Curie-Weiss temperatures suggestive of ferromagnetic (FM) interactions at high temperatures. Due to the AFM-FM competition the saturation magnetization in both compounds is reached already in modest magnetic fields with a nontrivial succession of two spin-flop and two spin-flip-like transitions in Ba[sub 3]Cu[sub 3]Sc[sub 4]O[sub 12]. We argue that the paper-chains in both compounds can be described as a system of Cu[supI]-2Cu[supII] trimers with a low-spin ground nstate which implies a non-magnetic spin-singlet Cu[supII] dimer state and a spin-polarized Cu[supI] ion.
ISSN:1098-0121
1550-235X