Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-04-18
Phys. Rev. B 84, 064412 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
Text and figures as published in Physical Review B
Scientific paper
10.1103/PhysRevB.84.064412
We present the results of a muon-spin relaxation (muSR) investigation into magnetic ordering in several families of layered quasi-two-dimensional molecular antiferromagnets based on transition metal ions such as S=1/2 Cu2+ bridged with organic ligands such as pyrazine. In many of these materials magnetic ordering is difficult to detect with conventional magnetic probes. In contrast, muSR allows us to identify ordering temperatures and study the critical behavior close to T_N . Combining this with measurements of in-plane magnetic exchange J and predictions from quantum Monte Carlo simulations we may assess the degree of isolation of the 2D layers through estimates of the effective inter-layer exchange coupling and in-layer correlation lengths at T_N . We also identify the likely metal-ion moment sizes and muon stopping sites in these materials, based on probabilistic analysis of the magnetic structures and of muon-fluorine dipole-dipole coupling in fluorinated materials.
Baines Chris
Baker Peter J.
Blundell Stephen J.
Conner Marianne M.
Lancaster Tom
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