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

Similar and Dissimilar Properties of Polymorphic Phases of NdIr3

“…The first-order temperature derivative of magnetic susceptibility reveals a single magnetic anomaly (T C ) near 10 K. As our system consists of two polymorphic phases, this anomaly must come from either of the two phases. Earlier, for other RIr 3 (R = Gd, Tb, Dy, Ho, Er) compounds, it was shown that the AuBe 5 -type structure orders ferromagnetically whereas the AuCu 3 -type structure remains paramagnetic down to the lowest measured temperature, 2.5 K. 35−37 Supported by the literature, 36,37 we have fitted the experimentally obtained inverse-susceptibility ( )…”

“…It was also pointed out in the literature that the stability of NdIr 3 , GdIr 3 , and DyIr 3 compounds lie at the borderline of the said two (AuCu 3 - and PuNi 3 -type) crystal structures. It should also be noted that a few RIr 3 (R = Gd, Tb, Dy, Ho, and Er) compounds − have also been reported to form as a rare coexistence of two polymorphic structures of AuCu 3 -type and a newer structure of AuBe 5 -type (reported earlier for RRh 3 and RPt 3 compounds) that was never predicted for any RIr 3 compounds (Figure ). It was also reported that while AuBe 5 -type RIr 3 (R = Gd, Tb, Dy, Ho, and Er) compounds mentioned above exhibit ferromagnetic ordering at low temperatures, their AuCu 3 -type polymorphic counterparts remain paramagnetic down to 2.5 K. − Another recent report on PuNi 3 -type NdIr 3 , formed after annealing at 1350 °C for 36 h and again at 1370 °C for 36 h under high vacuum, suggested the ferromagnetic ground state for that phase as well .…”

“…The first-order temperature derivative of magnetic susceptibility reveals a single magnetic anomaly ( T C ) near 10 K. As our system consists of two polymorphic phases, this anomaly must come from either of the two phases. Earlier, for other RIr 3 (R = Gd, Tb, Dy, Ho, Er) compounds, it was shown that the AuBe 5 -type structure orders ferromagnetically whereas the AuCu 3 -type structure remains paramagnetic down to the lowest measured temperature, 2.5 K. − Supported by the literature, , we have fitted the experimentally obtained inverse-susceptibility data using the modified Curie–Weiss relation where C is the Curie constant and and are the paramagnetic Weiss temperatures corresponding to the phases of AuCu 3 - and AuBe 5 -type structure. χ 0 is the temperature-independent magnetic contribution and n is the fraction of the AuCu 3 -type phase (i.e., 0.42).…”

“…The primary structural characterization of NdIr 3 has been carried out through an X-ray diffraction (XRD) technique at room temperature (Figure ). As mentioned earlier, because the R Ir 3 series of compounds are known to form in three different crystal structures viz., PuNi 3 , AuBe 5 , and AuCu 3 , − ,− the XRD pattern of those crystal structures are generated using PowderCell package, and it was observed that the XRD pattern of NdIr 3 does not fit with the theoretically generated pattern of PuNi 3 -type structure (lattice parameters and atomic positions taken from ref ). While most of the Bragg peaks could be matched with the theoretically generated XRD pattern of AuBe 5 -type, the remaining few unaccounted peaks could be identified with that belonging to the AuCu 3 -type crystal structure.…”

Pairing symmetry of an intermediate valence superconductor CeIr3 investigated using μSR measurements

“…The jump in the heat capacity of CeIr 3 is suppressed in a magnetic field of 6 T. The heat capacity data were fitted using C P (T )/T = γ + βT 2 , where γ and β are the electronic Sommerfeld coefficient and lattice specific heat coefficient, respectively. The least-squares fit yields γ = 21.66(2) mJ/(mol K 2 ), β = 1.812(1) mJ/(mol K 4 ), and then using β = n 12 5 π 4 R −3 D , where R is the universal gas constant and n is the number of atoms per formula unit, we estimate that the Debye temperature D = 162(2) K, which is similar to the D values of isostructural ThIr 3 (169 K) [41] and DyIr 3 (155 K) [42]. For comparison, in Fig.…”