Dimorphic cubic phases and magnetic properties of a new binary compound PrIr3. (November 2022)

• Record Type: Journal Article
• Authors: Mondal, Binita; Dan, Shovan; Mondal, Sudipta; Bhowmik, R.N.; Ranganathan, R.; Mazumdar, Chandan
• Is Part Of: Journal of physics and chemistry of solids. Volume 170(2022)
• Publication Date: 2022-11
• Subjects: Crystal structure -- Heat capacity -- X-ray diffraction -- Spin glasses -- Entropy -- Magnetocaloric; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2022.110970
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The binary polycrystalline compound PrIr3 is synthesized successfully by arc melting process. The powder X-ray diffraction data reveals that it forms as a macroscopically coexisting dimorphic phases of two different cubic structures (AuBe5 - and AuCu3 -type). The zero field specific-heat data and dc-magnetization data establishes that while the composition with AuBe5 -type structure order ferromagnetically below 12 K, AuCu3 -type phase does not show any magnetic order down to the lowest measurement temperature, 2.5 K. The magnetic relaxation, ac magnetization and magnetic memory effect measurement confirms presence of glassy nature in the system which is likely to have originated from the boundary region separating ordered ferromagnetic phase to the paramagnetic phase. As a result, the spin-freezing temperature ( T S G ∼ 12 K) appear to be very close to the Curie temperature ( T C ∼ 12 K) in this compound. The critical analysis near second order magnetic phase transition provides accurate magnetic transition temperature as well as helps to identify the universal magnetic class of PrIr3 forming in AuBe5 -type structure. The magnetocaloric effect of PrIr3 has been studied from magnetization and specific heat data which reproduce the same values of critical exponents, α, β and γ, although estimated using a different technique. Graphical abstract: Highlights: Synthesis of new intermetallic compound PrIr3 with coexisting polymorphic structure. One of the phases (cubic AuBe5 -type) orders ferromagnetically. Another phase (cubic AuCu3 -type) remains paramagnetic down to 2.5 K. The compound exhibits spin glass behavior below its ferromagnetic phase transition. Values of critical exponents confirm that PrIr3 lies in mean field class.