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Magnons and spinons in Ba$$_{2}$$CoTeO$$_{6}$$; A Composite system of isolated spin-$$frac{1}{2}$$ triangular Heisenberg-like and frustrated honeycomb Ising-like antiferromagnets

Kojima, Yuki*; Kurita, Nubuyuki*; Tanaka, Hidekazu*; Nakajima, Kenji  

We report the neutron scattering results on magnetic orderings and excitations in Ba$$_{2}$$CoTeO$$_{6}$$ composed of two almost isolated subsystems A and B, which are described as an $${S = 1/2}$$ triangular Heisenberg-like antiferromagnet and a frustrated honeycomb Ising-like antiferromagnet, respectively. It was found that the excitation spectra of both subsystems are well separated and independent of each other. The excitation spectrum of subsystem A is composed of two single-magnon branches with roton-like minima at the M point and a clearly structured intense continuum, as similarly observed in Ba$$_{3}$$CoSb$$_{2}$$O$$_{9}$$, which is strongly indicative of spinon excitations. Dispersion curves for subsystem B can be described by linear spin wave theory within the third-neighbor exchange interaction.



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Category:Materials Science, Multidisciplinary



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