ESR studies of lithium tetrafluorotetracyanoquinodimethanide salt exhibiting weak ferromagnetism below 12 K

The lithium tetrafluorotetracyanoquinodimethanide salt exhibits weak ferromagnetism below 12 K. The present study reports the temperature dependence of the ESR spectra in both polycrystalline and single crystalline solids. The long-range spin ordering resonance below 12 K is observed, which is considered as a sign of weak ferromagnetism and different from a normal antiferromagnetic resonance in nature.