Journal
PHYSICAL REVIEW B
Volume 80, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.140407
Keywords
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Funding
- NSF [DMR-0552267, DMR-0856234, EPS-0814194]
- U. S. DOE [DE-FG02-97ER45653, DE-FG02-98ER45707]
- Direct For Mathematical & Physical Scien [GRANTS:13816817] Funding Source: National Science Foundation
- Division Of Materials Research [GRANTS:13816817] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0856234] Funding Source: National Science Foundation
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Our magnetic, electrical, and thermal measurements on single crystals of the J(eff)=1/2 Mott insulator, Sr2IrO4, reveal a giant magnetoelectric effect (GME) arising from a frustrated magnetic/ferroelectric state whose signatures are: (1) a strongly enhanced electric permittivity that peaks near an observed magnetic anomaly at 100 K, and (2) a large (similar to 100%) magnetodielectric shift that occurs near a metamagnetic transition. The GME hinges on a spin-orbit gapping of 5d bands rather than the magnitude and spatial dependence of magnetization, as traditionally accepted.
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