New integrable quantum chains combining different kinds of spins

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Abstract
A general procedure to generate new integrable Hamiltonians combining to any kind of spins distributed arbitrarily on the line is given. As a concrete application, anisotropic chains formed by spin-1/2 and spin-1 operators at alternating sites are presented and solved exactly by the Bethe ansatz (BA). The authors compute the ground-state and excitation energies and momentum. The higher-order BA equations are derived. Depending on the choice, these new Hamiltonians exhibit, or not, conformal invariance in their low energy spectrum.