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| - Spin Dimer Analysis of the Spin Exchange Interactions inParamelaconite Cu4O3 and Its Analogue Ag2Cu2O3 and the SpinOrdering of the Cu2O3 Spin Lattice Leading to Their Magnetic PhaseTransitions
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| - The magnetic structures of the Cu2O3 spin lattices present in Cu4O3 and Ag2Cu2O3 were analyzed by studying theirspin exchange interactions on the basis of spin dimer analysis. Calculations of spin exchange parameters werecalibrated by studying LiCuVO4 whose intrachain and interchain antiferromagnetic spin exchange parameters areknown experimentally. The magnetic phase transition of Cu4O3 at 42.3 K doubles the unit cell along eachcrystallographic direction. The spin arrangements of the Cu2O3 lattice consistent with this experimental observationare different from conventional antiferromagnetic ordering. Our analysis indicates that spin fluctuation should occurin Cu4O3, low-dimensional magnetism should be more important than magnetic frustration in Cu4O3, and Ag2Cu2O3and Cu4O3 should have similar structural and magnetic properties.
- The magnetic phase transition of paramelaconite Cu4O3 at 42.3 K doubles the unit cell along each crystallographic direction. The origin of this observation was examined by estimating spin exchange parameters of the Cu2O3 spin lattice in Cu4O3 on the basis of spin dimer analysis. The ordered spin arrangements of the Cu2O3 lattice consistent with the observed superlattice formation differ from conventional antiferromagnetic ordering. Spin fluctuation should occur in Cu4O3, and low-dimensional magnetism should be more important than magnetic frustration in Cu4O3. Ag2Cu2O3 should be similar to Cu4O3 in structural and magnetic properties.
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