We report a comprehensive investigation of the quasi-one-dimensional spin-chain compound ${\mathrm{Ca}}_3{\mathrm{CoIrO}}_6$ (CCIO) using x-ray and neutron diffraction, dc and ac magnetization, specific heat, electrical resistivity, Raman spectroscopy, and polarization–electric-field measurements. The results reveal a gradual evolution of partially disordered antiferromagnetic (PDA) correlations below $T_2\approx 100$ K, followed by freezing of the disordered spin component below $T_1\approx 30$ K. Ac susceptibility and magnetic relaxation measurements demonstrate slow spin dynamics in the intermediate-temperature regime, while the low-temperature state exhibits a large exchange-bias effect under both zero-field-cooled and field-cooled conditions. A field-induced anomaly observed in both magnetization and magnetic specific heat for fields (≳30 kOe) is attributed to the reorientation of the magnetically disordered chain fraction within the PDA framework. Raman spectroscopy reveals the emergence of an additional spectral feature together with anomalies in the dominant ${\mathrm{IrO}}_6$ stretching mode below $T_2$, indicating spin-lattice coupling associated with the development of magnetic correlations. Neutron diffraction detects no crystallographic phase transition, while polarization–electric-field measurements reveal a temperature-dependent crossover from dielectric to resistive behavior that closely follows the magnetic phase evolution. These results establish CCIO as a frustrated quasi-one-dimensional system in which geometric frustration, spin-orbit coupling, and low dimensionality cooperate to produce a field-tunable PDA state with coupled magnetic and lattice responses.

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• Frustrated magnetism
• 1-dimensional spin chains
• Electrical transport techniques
• Magnetization measurements
• Neutron diffraction
• Raman spectroscopy