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Fractional magnetization plateaus in the Shastry-Sutherland lattice material Er2Be2GeO7
Mathew Pula1, Sudarshan Sharma1, Jonah Gautreau1
1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
Abstract:
The experimental study of magnetism on the Shastry-Sutherland lattice (SSL) has been ongoing for more than two decades, following the discovery of the first SSL material SrCu2(BO3)2. However, investigation of SSL systems is often complicated by the requirements of high magnetic fields (e.g.>20 T for SrCu2(BO3)2) or the presence of itinerant electrons (e.g. REB4). In this paper, we present the magnetic properties of the SSL material Er2Be2GeO7. Like SrCu2(BO3)2, Er2Be2GeO7exhibits fractional magnetization plateaus. However, unlike SrCu2(BO3)2, Er2Be2GeO7exhibits long-range order below∼1 K, and the plateaus are accessible using commercial laboratory equipment, occurring for fields<1 T. The fractions of magnetization present are closest to1/4,4/9, and1/2of the saturation magnetization. Hysteresis is observed in the4/9and1/2plateau phases. The lack of itinerant electrons, chemical disorder, and the low fields required to access the fractional magnetization plateaus promise Er2Be2GeO7as a prime candidate for the study of frustrated magnetism on the SSL.
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