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The ground state spin-wave excitations and thermodynamic properties of twotypes of ferrimagnetic chains are investigated: the alternating spin-1/2spin-5/2 chain and a similar chain with a spin-1/2 pendant attached to thespin-5/2 site. Results for magnetic susceptibility, magnetization and specificheat are obtained through the finite-temperature Lanczos method with the aim indescribing available experimental data, as well as comparison with theoreticalresults from the semiclassical approximation and the low-temperaturesusceptibility expansion derived from Takahashi's modified spin-wave theory. Inparticular, we study in detail the temperature vs. magnetic field phase diagramof the spin-1/2 spin-5/2 chain, in which several low-temperature quantum phasesare identified: the Luttinger Liquid phase, the ferrimagnetic plateau and thefully polarized one, and the respective quantum critical points and crossoverlines.

Quantum phase transitions in alternating spin-(1/2, 5/2) Heisenberg chains