Journal
PHYSICAL REVIEW B
Volume 86, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.014428
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Funding
- National Science Foundation Materials World Network Grant [DMR-0710525]
- NSF CAREER Award [DMR-1056625]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1056625] Funding Source: National Science Foundation
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We present results from muon spin relaxation/rotation, magnetization, neutron scattering, and transport measurements on polycrystalline samples of the pyrochlore iridates Y2Ir2O7 (Y-227) and Yb2Ir2O7 (Yb-227). Well-defined spontaneous oscillations of the muon asymmetry are observed together with hysteretic behavior in magnetization below 130 K in Yb-227, indicative of commensurate long-range magnetic order. Similar oscillations are observed in Y-227 below 150 K; however, the onset of hysteretic magnetization at T = 190 K indicates a transition to an intermediate state lacking long-range order as observed in Nd-227. Our results also show that insulating members of the iridate family have nearly identical magnetic ground states, and that the presence of magnetic A-site species does not play any significant role in altering the ground-state properties.
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