Spin liquid behaviour in Jeff=1/2 triangular lattice Ba3IrTi2O9
  Ba3IrTi2O9 crystallizes in a hexagonal structure consisting of a layered triangular arrangement of Ir4+ (Jeff=1/2). Magnetic susceptibility and heat capacity data show no magnetic ordering down to 0.35K inspite of a strong magnetic coupling as evidenced by a large Curie-Weiss temperature=-130K. The magnetic heat capacity follows a power law at low temperature. Our measurements suggest that Ba3IrTi2O9 is a 5d, Ir-based (Jeff=1/2), quantum spin liquid on a 2D triangular lattice. 
Tusharkanti Dey, A.V. Mahajan, P. Khuntia, M. Baenitz, B. Koteswararao   and F.C. Chou
cond-mat.str-el