Complementary techniques for probing terahertz magnetic excitations in Cu3Bi(SeO3)2O2Cl

A low frequency magnetic excitation in Cu
₃
Bi(SeO
₃
)
₂
O
₂
Cl has been studied through complementary spectroscopic techniques which utilised terahertz radiation from a synchrotron, a mercury arc lamp, and a two-colour photomixing system. The excitation has been studied at temperatures down to 5K and in magnetic fields up to 10T.