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)

• Main Authors: Dun, Zhiling, Trinh, Jennifer, Li, Kuo, Lee, Minseong, Chen, Kuan-wen, Baumbach, Ryan, Hu, Yufei, Wang, Yingxia, Choi, Eun Sang, Shastry, B. Sriram, Ramirez, Arthur P., Zhou, Haidong
• Format: Text
• Language: unknown
• Published: arXiv 2016
• Subjects: Strongly Correlated Electrons cond-mat.str-el; FOS Physical sciences; Dy; Ice cap
• Online Access: https://dx.doi.org/10.48550/arxiv.1601.01575; https://arxiv.org/abs/1601.01575

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. : 5 pages, 2 figures with supplemental material