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We report a spin S = 3/2 triangular antiferromagnet with nearest-neighborcoupling J = 0.29 meV in La2Ca2MnO7. A genuinely two-dimensional,three-sublattice order develops below 2.80 K << the Weiss constant (25 K). Thespin excitations deviate substantially from linear spin-wave theory, suggestingthat magnon breakdown occurs in the material. Such a breakdown has beenanticipated in recent theoretical studies, although the excitation spectrumremains to be accounted for.

Spin Order and Excitations in Triangular Antiferromagnet La2Ca2MnO7