We report on thermodynamic, magnetization, and muon spin relaxation measurements of the strong spin-orbit coupled iridate Ba3IrTi2O9, which constitutes a new frustration motif made up a mixture of edge- and corner-sharing triangles. In spite of strong antiferromagnetic exchange interaction of the order of 100~K, we find no hint for long-range magnetic order down to 23 mK. The magnetic specific heat data unveil the T-linear and -squared dependences at low temperatures below 1~K. At the respective temperatures, the zero-field muon spin relaxation features a persistent spin dynamics, indicative of unconventional low-energy excitations. A comparison to the 4d isostructural compound Ba3RuTi2O9 suggests that a concerted interplay of compass-like magnetic interactions and frustrated geometry promotes a dynamically fluctuating state in a triangle-based iridate.
@article{arxiv.1707.03140,
title = {Putative spin liquid in the triangle-based iridate Ba$_3$IrTi$_2$O$_9$},
author = {W. -J. Lee and S. -H. Do and Sungwon Yoon and S. Lee and Y. S. Choi and D. J. Jang and M. Brando and M. Lee and E. S. Choi and S. Ji and Z. H. Jang and B. J. Suh and K. -Y. Choi},
journal= {arXiv preprint arXiv:1707.03140},
year = {2017}
}