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A classical-quantum chain composed of regularly alternating Ising andHeisenberg spins is rigorously solved by considering two distinct localanisotropy axes of the Ising spins. The ground-state phase diagram andmagnetization curves are examined depending on a spatial orientation of theapplied magnetic field. The phase diagram totally consists of four distinctphases and a few macroscopically degenerate points, where an outstandingcoexistence of perfect order and complete disorder occurs within the so-called'half-fire, half-ice' state. The zero-temperature magnetization curvesgenerally exhibit a smooth dependence on a magnetic field owing to a cantingangle between two coplanar anisotropy axes of the Ising spins, which enforces amisalignment of the magnetization vector from a direction of the appliedmagnetic field. It is evidenced that the investigated spin-chain modelreproduces magnetic features of the heterobimetallic coordination compoundDy(NO)$_{3}$(DMSO)$_{2}$Cu(opba)(DMSO)$_{2}$ (DMSO=dimethylsulfoxide,opba=orthophenylenebisoxamato). The high-field magnetization data reported forthe powder sample of this polymeric coordination compound generally display asubstantial smoothing on account of a powder averaging.

Heterobimetallic Dy-Cu coordination compound as a classical-quantum ferrimagnetic chain of regularly alternating Ising and Heisenberg spins