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We report unexpected behaviour in a family of Cu spin- 1/2 systems, in whichan apparent gap in the low energy magneto-optical absorption spectrum opens atlow temperature. This previously unreported collective phenomenon arises attemperatures where the energy of the dominant exchange interaction exceeds thethermal energy. Simulations of the observed shifts in electron paramagneticresonance spectral weight, which include spin anisotropy, reproduce thisbehavior yielding the magnitude of the spin anisotropy in these compounds.

A new collective phenomenon arising from spin anisotropic perturbations  to a Heisenberg square lattice manifested in paramagnetic resonance  experiments