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A theory is developed on one- and two-magnon excitations of a one-dimensional Heisenberg antiferromagnet in a magnetic field with a particular reference to TMMC. The effect of nonlinear couplings among magnons is sutdied in details. It is shown that the magnetic field causes a hybridization between one- and two-magnon states through the third-order coupling. This coupling is shown to be quite important to understand the result of recent neutron scattering on TMMC by Heilmann et al.
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Osano et al. (1982) studied this question.
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