Evidence for low-temperature antiferromagnetic phase transition in Ising singlet magnet KTb(WO4)2

The magnetic susceptibility and magnetization measured along the b axis of a KTb(WO4)2 single crystal was investigated experimentally in the temperature range 70 mK–6 K and in magnetic fields up to 8 T. The results allow us to make conclusion that singlet magnet KTb(WO4)2 undergoes an antiferromagnetic phase transition Tc = 0.65 K.