Magnon-bound state resonance in the quasi-1d antiferromagnet RbCoCl3 ·2H2O

Abstract Electron spin resonance is studied for 2.6 K T H ≃ 0 and has maximum intensity just above T N . From a realistic spin Hamiltonian we infer that magnon-bound state resonance was observed. The linewidth follows a T 4 law for T > T N .