High Frequency ESR measurements on thiospinel CuCrZrS4

Thiospinel CuCrZrS4 has been studies by high frequency ESR using Millimeter wave Vector Network Analyzer (MVNA, ABmm). A lorentzian absorption line in ESR spectrum is observed at high temperatures. The estimated G-value is 1.98 at K. This value well agrees with the g value Cr3+ free ion. With decreasing the temperature, the absorption at high field, another absorption slightly shifts to lower field with decreasing the temperature. Resonance fields of both absorptions increase with increasing frequency at 4K linearly. A possible model is discussed on the basis of the coexistent state of ferromagnetism and paramagnetism