Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
267206
Volume
109
Issue
26
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 TN, implies that the system is in close proximity to one of two spin-liquid
states that have been predicted for a 2D triangular lattice.