Spin gap in a quasi-1D S=1/2 antiferromagnet K2CuSO4Cl2

T. A. Soldatov, A. I. Smirnov, K. Yu. Povarov +3

Electron spin resonance experiments in the quasi-1D S=1/2 antiferromagnet K${}_2$CuSO${}_4$Cl${}_2$ reveal opening of a gap in absence of magnetic ordering, as well as an anisotropic shi…