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  Povarov, K. Yu.; Wosnitza, J.; Hanna, A. R. N.; Islam, A. T. M. N.; Lake, B.; Zvyagin, S. A.: Electronic spin resonance in the double-perovskite oxide antiferromagnet Ba₂CoWO₆. Applied Magnetic Resonance 56 (2025), p. 1549-1558

10.1007/s00723-025-01811-x
Open Access Version

Abstract:
We report electron spin resonance studies of double perovskite Ba2CoWO6 single crystals. Above TN = 14 K, we observe a paramagnetic resonance with geff similar or equal to 3.66. Upon cooling, this mode transforms into a broad antiferromagnetic resonance (AFMR) with a zero-field energy gap of about 200 GHz. The AFMR becomes barely detectable at low magnetic fields, indicating unusually strong decay processes. We argue that symmetry-allowed anisotropic spin-spin interactions are a possible reason for the pronounced spin-wave damping. Linear spin-wave theory calculations support this scenario.