"K. Yokota,N. Kurita,H. Tanaka","Magnetic Phase Diagram of the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba<sub>3</sub>CoNb<sub>2</sub>O<sub>9</sub>",,"Phys. Rev. B",,"  90",,"  014403 (1-6)",2014,July