Journal
PHYSICAL REVIEW B
Volume 83, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.180402
Keywords
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Funding
- U.S. NSF [0801407, 0604105]
- JSPS, Japan [21684019]
- MEXT, Japan [19052003]
- Direct For Mathematical & Physical Scien [801407] Funding Source: National Science Foundation
- Division Of Materials Research [801407] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [19052003, 21684019] Funding Source: KAKEN
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Muon spin rotation and relaxation experiments in the pyrochlore iridate Eu2Ir2O7 yield a well-defined muon spin precession frequency below the metal-insulator/antiferromagnetic transition temperature T-M = 120 K, indicative of long-range commensurate magnetic order and thus ruling out quantum spin liquid and spin-glass-like ground states. The dynamic muon spin relaxation rate is temperature-independent between 2 K and similar to T-M and yields an anomalously long Ir4+ spin correlation time, suggesting a singular density of low-lying spin excitations. Similar behavior is found in other pyrochlores and geometrically frustrated systems, but also in the unfrustrated iridates BaIrO3 and Sr2Ir2O4. Eu2Ir2O7 may be only weakly frustrated; if so, the singularity might be associated with the small-gap insulating state rather than frustration.
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