Observation of<i>S</i>=1/2 degrees of freedom in an<i>S</i>=1 linear-chain Heisenberg antiferromagnet
THe ground state of the typical spin-1 linear-chain Heisenberg antiferromagnet Ni(${\mathrm{C}}_{2}$${\mathrm{H}}_{8}$${\mathrm{N}}_{2}$${)}_{2}$${\mathrm{NO}}_{2}$(${\mathrm{Cl...