Journal
PHYSICAL REVIEW B
Volume 84, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.064412
Keywords
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Funding
- Engineering and Physical Sciences Research Council, UK
- Science and Technology Facilities Council
- European Commission [CP-CSA_INFRA-2008-1.1.1, 226507-NMI3]
- National Science Foundation [DMR-1005825]
- UChicago Argonne, LLC
- Operator of Argonne National Laboratory (Argonne). Argonne
- US Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
- EPSRC [EP/G003092/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G003092/1] Funding Source: researchfish
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005825] Funding Source: National Science Foundation
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We present the results of a muon-spin relaxation (mu+SR) 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, mu+SR 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.
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