On integrable Hamiltonians for higher spin XXZ chain

Integrable Hamiltonians for higher spin periodic XXZ chains are constructed in terms of the spin generators; explicit examples for spins up to 3/2 are given. Relations between Hamiltonians for some U-q(sl(2))-symmetric and U(1)-symmetric universal r-matrices are studied; their properties are investigated. A certain modification of the higher spin periodic chain Hamiltonian is shown to be an integrable U-q(sl(2))-symmetric Hamiltonian for an open chain. (C) 2003 American Institute of Physics.