Coupling between Charge Density Wave Ordering and Magnetism in Ho₂Ir₃Si₅

Ho2Ir3Si5 belongs to the family of three-dimensional (3D) R2Ir3Si5 (R = Lu, Er and Ho) compounds that exhibit a colossal first-order charge density wave (CDW) transition where there is strong orthorhombic-to-triclinic distortion lattice accompanied by superlattice reflections. The analysis single-crystal X-ray diffraction (SXRD) has revealed Ir-Ir zigzag chains along c are responsible for CDW in all three compounds. replacement rare earth element from non-magnetic Lu magnetic or Ho lowers TCDW, TCDWLu 200 K, TCDWEr 150 K TCDWHo 90 K. Out compounds, only system second-order reflections could be observed, indicative an anharmonic shape modulation wave. observed as anomalies temperature dependencies specific heat, electrical conductivity susceptibility, which includes large hysteresis 130 measured properties, thus corroborating SXRD measurements. Similar previously reported Er2Ir3Si5, appears coupling between magnetism such Ho3+ moments influenced transition, even paramagnetic state. Moreover, earlier investigations on polycrystalline material antiferromagnetic (AFM) ordering at TN 5.1 whereas AFM order suppressed present our highly ordered single-crystal. First-principles calculations predict metal with coexisting electron hole pockets Fermi level. Ir atoms have spherically symmetric metallic-type distributions prone distortion. Phonon affirm primarily distortion, agreement experiment.