Identification and critical phenomenon studies of polymorphic phases in binary intermetallic compound DyIr3

摘要

The rare-earth and transition-metal based polycrystalline, binary compound DyIr3 has been synthesized successfully and is found to form as a macroscopic coexistence of AuBe5 and AuCu3-type polymorphic structures. The analysis of dc magnetization and specific heat data reveals that among the two polymorphic phases, the AuBe5-type phase exhibits ferromagnetic ground state below 22 K, while AuCu3-type phase shows paramagnetic behaviour down to 2 K. The detail studies of magnetic relaxation, magnetic memory effect and frequency dependency of ac magnetic susceptibility establish the presence of glassy phase in the system. The critical behaviour have been investigated for DyIr3 in detail in the vicinity of its magnetic transition temperature by means of dc magnetization, specific heat data, Arrott-Noakes plot, Kouvel-Fisher plot, critical isotherm, and magnetocaloric study. The type of magnetic universal class, in which DyIr3 belongs, has been identified through the critical behaviour study.