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arXiv · 1601.01575

Removing the spin ice cap: magnetic ground states of rare earth tripod kagome lattice Mg$_2$RE$_3$Sb$_3$O$_{14}$ (RE = Gd, Dy, Er)

Zhiling Dun·Jennifer Trinh·Kuo Li·Minseong Lee·Kuan-wen Chen·Ryan Baumbach·Yufei Hu·Yingxia Wang·Eun Sang Choi·B. Sriram Shastry·Arthur P. Ramirez·Haidong Zhou
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Abstract

We present the structural and magnetic properties of a new compound family, Mg$_2$RE$_3$Sb$_3$O$_{14}$ (RE = Gd, Dy, Er), with a hitherto unstudied frustrating lattice, the "tripod kagome" structure. Susceptibility (ac, dc) and specific heat exhibit features that are understood within a simple Luttinger-Tisza type theory. For RE = Gd, we found long ranged order (LRO) at 1.65 K, which is consistent with a 120 $^{\circ}$ structure, demonstrating the importance of diople interactions for this 2D Heisenberg system. For RE = Dy, LRO at 0.37 K is related to the "kagome spin ice (KSI)" physics for a 2D system. This result shows that the tripod kagome structure accelerates the transition to LRO predicted for the related pyrochlore systems. For RE = Er, two transitions, at 80 mK and 2.1 K are observed, suggesting the importance of quantum fluctuations for this putative XY system.

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Zhiling Dun, Jennifer Trinh, Kuo Li, Minseong Lee, Kuan-wen Chen, Ryan Baumbach, Yufei Hu, Yingxia Wang, Eun Sang Choi, B. Sriram Shastry, Arthur P. Ramirez, Haidong Zhou. 2016-01-07. Removing the spin ice cap: magnetic ground states of rare earth tripod kagome lattice Mg$_2$RE$_3$Sb$_3$O$_{14}$ (RE = Gd, Dy, Er). https://doi.org/10.1103/physrevlett.116.157201

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