title: Spin liquid state in the S = 1/2 triangular lattice Ba3CuSb2O9.
abstract: The synthesis and characterization of Ba3CuSb2O9, which has a layered array of Cu2+ spins in a triangular lattice, are reported. The magnetic susceptibility and neutron scattering experiments of this material show no magnetic ordering down to 0.2 K with a θ(CW) = -55  K. The magnetic specific heat reveals a T-linear dependence with a γ = 43.4  mJ  K(-2)  mol(-1) below 1.4 K. These observations suggest that Ba3CuSb2O9 is a new quantum spin liquid candidate with a S = 1/2 triangular lattice.
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA. zhou@magnet.fsu.edu
authors.forename: H D
authors.initials: HD
authors.lastname: Zhou
authors.forename: E S
authors.initials: ES
authors.lastname: Choi
authors.forename: G
authors.initials: G
authors.lastname: Li
authors.forename: L
authors.initials: L
authors.lastname: Balicas
authors.forename: C R
authors.initials: CR
authors.lastname: Wiebe
authors.forename: Y
authors.initials: Y
authors.lastname: Qiu
authors.forename: J R D
authors.initials: JR
authors.lastname: Copley
authors.forename: J S
authors.initials: JS
authors.lastname: Gardner