Successive Phase Transitions and Extended Spin-Excitation Continuum in theS=12Triangular-Lattice AntiferromagnetBa3CoSb2O9 Academic Article uri icon

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abstract

  • Using magnetic, thermal, and neutron measurements on single-crystal samples, we show that Ba3CoSb2O9 is a spin-1/2 triangular-lattice antiferromagnet with the c axis as the magnetic easy axis and two magnetic phase transitions bracketing an intermediate up-up-down phase in magnetic field applied along the c axis. A pronounced extensive neutron-scattering continuum above spin-wave excitations, observed below T(N), implies that the system is in close proximity to one of two spin-liquid states that have been predicted for a 2D triangular lattice.

authors

  • Zhou, HD
  • Xu, Cenke
  • Hallas, AM
  • Silverstein, HJ
  • Wiebe, Christopher
  • Umegaki, I
  • Yan, JQ
  • Murphy, TP
  • Park, J-H
  • Qiu, Y
  • Copley, JRD
  • Gardner, JS
  • Takano, Y

publication date

  • December 28, 2012