Abstract
Magnetic and electrical properties of R5Ir3 (R = Tb, Er) polycrystals with hexagonal structure have been studied by measuring magnetization, dc magnetic susceptibility, and electrical resistivity. Tb5Ir3 shows reentrant magnetism; it possesses ferromagnetic state below TC = 49 K and antiferromagnetic state takes place at Tt = 6.5 K. In the antiferromagnetic state, irreversible magnetic field-induced antiferromagnetic to ferromagnetic transition was observed. Meanwhile, Er5Ir3 shows ferromagnetic property below TC = 10 K; antiferromagnetic state exists below Tt = 2.1 K. In the low temperature antiferromagnetic state, the irreversible antiferromagnetic to ferromagnetic transition was also observed. Paramagnetic susceptibility shows Curie-Weiss behavior in both compounds; the effective magnetic moment is in good agreement with the theoretical values of Tb3+ and Er3+ ions. Electrical resistivity indicated the metallic property; distinct anomalies were observed at the transition temperatures for both compounds.
Highlights
Rare earth compounds R5Ir3 (R = Tb, Er) crystallize in the Mn5Si3 type hexagonal structure with the space group P63/mcm in which R occupies two non-equivalent sites
Small magnetization jumps were recognized at HC1 and HC2 in the initial magnetizing process; as shown in Fig. 2(a), remanent magnetization of 2.0 μB/Tb was observed after decreasing the field. This indicates that Tb5Ir3 show an irreversible antiferromagnetic (AFM) to ferromagnetic (FM) transition which has been reported in several compounds, Dy3Co8 or Nd5Ge3.9 Interestingly, a relatively large magnetization jump was observed in the second magnetizing process in the induced ferromagnetic state, too
Tb5Ir3 shows reentrant magnetic property; the two magnetic transitions from PM to FM and FM to AFM were observed at T C = 49 K and T t = 6.5 K, respectively
Summary
Rare earth compounds R5Ir3 (R = Tb, Er) crystallize in the Mn5Si3 type hexagonal structure with the space group P63/mcm in which R occupies two non-equivalent sites. Tb5Ge3 is an antiferromagnet with T N = 85 K;4 complex magnetic structure has been revealed.[5] Magnetic and neutron diffraction measurements have been carried out for Er5Sb3,6 Er5Ge3;7 antiferromagnetic properties were reported. For the R5Ir3 compounds, the magnetic and electrical properties as well as magnetic phase transitions have not been reported so far, as far as we know. We have prepared single phase polycrystalline samples of R5Ir3 (R = Tb, Er) and investigated magnetic and electrical properties by the measurement of magnetization, magnetic susceptibility and electrical resistivity
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