RT Journal Article T1 Exchange operator formalism for N-body spin models with near-neighbours interactions A1 Enciso, Alberto A1 Finkel Morgenstern, Federico A1 González López, Artemio A1 Rodríguez González, Miguel Ángel AB We present a detailed analysis of the spin models with near-neighbours interactions constructed in our previous paper (Enciso et al 2005 Phys. Lett. B 605 214) by a suitable generalization of the exchange operator formalism. We provide a complete description of a certain flag of finite-dimensional spaces of spin functions preserved by the Hamiltonian of each model. By explicitly diagonalizing the Hamiltonian in the latter spaces, we compute several infinite families of eigenfunctions of the above models in closed form in terms of generalized Laguerre and Jacobi polynomials. PB IOP Publishing Ltd SN 1751-8113 YR 2007 FD 2007-02-23 LK https://hdl.handle.net/20.500.14352/51497 UL https://hdl.handle.net/20.500.14352/51497 LA eng NO ©IOP Publishing Ltd.This work was partially supported by the DGI under grant no. FIS2005-00752. A.E. acknowledges the financial support of the Spanish Ministry of Education through an FPU scholarship NO DGI, Spain NO Spanish Ministry of Education DS Docta Complutense RD 6 abr 2025