Work

Electron Spin Resonance in the Double-Perovskite Oxide Antiferromagnet Ba$$_2$$CoWO$$_6$$

Year: 2025

Type: article

Abstract: We report electron spin resonance studies of double perovskite Ba $$_2$$ 2 CoWO $$_6$$ 6 single crystals. Above $$T_\textrm{N} = 14$$ T N = 14 K, we observe a paramagnetic resonance with $$g_\textrm{eff}\simeq 3.66$$ g eff ≃ 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.

Source: Applied Magnetic Resonance

DOI: 10.1007/s00723-025-01811-x

Authors: K. Yu. Povarov, J. Wosnitza, A. R. N. Hanna, A. T. M. Nazmul Islam, B. Lake, S. A. Zvyagin