Magnetic properties of the germanides RE ₃Pt₄Ge₆ (RE=Y, Pr, Nd, Sm, Gd–Dy)

Abstract

The germanides RE3Pt4Ge6 (RE=Y, Pr, Nd, Sm, Gd–Dy) have been synthesized by arc-melting of the elements followed by inductive annealing to improve the crystallinity and allow for structural order. The compounds have been studied by powder X-ray diffraction; additionally the structure of Y3Pt4Ge6 has been refined from single-crystal X-ray diffractometer data. It exhibits a (3+1)D modulated structure, indicating isotypism with Ce3Pt4Ge6. The crystal structure can be described as an intergrowth between YIrGe2- and CaBe2Ge2-type slabs along [100]. Temperature-dependent magnetic susceptibility measurements showed Pauli paramagnetism for Y3Pt4Ge6 and Curie-Weiss paramagnetism for Pr3Pt4Ge6 and Nd3Pt4Ge6. Sm3Pt4Ge6 exhibits van Vleck paramagnetism, while antiferromagnetic ordering at TN=8.1(1) K and TN=11.0(1) K is observed for Gd3Pt4Ge6 and Tb3Pt4Ge6, respectively.

Magnetic Properties of theRE2Pt6X15(RE= Y, La–Nd, Sm, Gd–Lu;X= Al, Ga) Series

“…In comparison with other intermetallic compounds, e.g. SmPdGa 3 (Δ E = 1346 K) or HP‐SmPdSn (Δ E = 1366 K) exhibit higher values, however, also a number of compounds with significantly lower energy values [Δ E = 265 K for SmRu 2 Zn 20 , 412 K for SmCo 2 Zn 20 , 454 K for Sm 3 Pt 4 Ge 6 , 480 K for Sm 2 RuAl 3 , 703 K for Sm 2 Rh 3 Sn 5 , 714 K for Sm 2 CoIn 8 , 850 K for SmOs 4 Sb 12 or finally 942(2) K for SmPt 6 Al 3 ] have been observed and reported. The ZFC/FC curves for Sm 2 Pt 6 Ga 15 are finally depicted in Figure (bottom), exhibiting a splitting of the ZFC and FC curves, underlining the ferrimagnetic ground state, in analogy to Pr 2 Pt 6 Ga 15 and Nd 2 Pt 6 Ga 15 described before.…”

Extending the knowledge on the quaternary rare earth nickel aluminum germanides of the RENiAl4Ge2 series (RE=Y, Sm, Gd–Tm, Lu) – structural, magnetic and NMR-spectroscopic investigations

“…The effective magnetic moment is slightly smaller than the value of 0.845 μ B of the free ion, δ = 247(2) K corresponds to ΔE = 706 K. The energy difference is smaller compared to the value of 1550 K predicted by Stewart, however, a look into the literature reveals that several compounds were shown to exhibit lower values. ΔE = 454 K are found for Sm 3 Pt 4 Ge 6 [66], 850 K for SmOs 4 Sb 12 [67], 1080 K for SmRh 4 B 4 [64], 412, 265, and 1488 K for SmCo 2 Zn 20 , SmRu 2 Zn 20 , and SmPd 2 Cd 20 [68], 1346 K for SmPdGa 3 [69], 1366 K for HP-SmPdSn [70], but also even higher values such as ΔE = 2691 K for SmPt 6 Al 3 are known [71]. (Fig.…”

Crystallographic Disorder and Strong Magnetic Anisotropy in Dy3Pt2Sb4.48

“…Measurements of the magnetic properties of these materials revealed that only Gd 3 Pt 4 Ge 6 and Tb 3 Pt 4 Ge 6 were antiferromagnetically ordered while others were paramagnetic. 20 A pure phase of polycrystalline Dy 3 Pt 4 Ge 6 could not be synthesized, and thus its magnetic properties were not reported. 20 Here, we replaced Ge with Sb and obtained millimeter-sized single crystals of Dy 3.00(1) Pt 2 Sb 4.48 (2) with crystallographic disorder on both Dy and Sb sites.…”

“…20 A pure phase of polycrystalline Dy 3 Pt 4 Ge 6 could not be synthesized, and thus its magnetic properties were not reported. 20 Here, we replaced Ge with Sb and obtained millimeter-sized single crystals of Dy 3.00(1) Pt 2 Sb 4.48 (2) with crystallographic disorder on both Dy and Sb sites. Dy 3.00(1) Pt 2 Sb 4.48 (2) appears to be a new material which crystallizes in a structural type similar to that of RE 3 Pt 4 Ge 6 .…”

“…What is interesting about Ln 3 Pt 4 Ge 6 is that the atoms on the Ln site construct frameworks of both a tilted square lattice and a triangular lattice. Measurements of the magnetic properties of these materials revealed that only Gd 3 Pt 4 Ge 6 and Tb 3 Pt 4 Ge 6 were antiferromagnetically ordered while others were paramagnetic . A pure phase of polycrystalline Dy 3 Pt 4 Ge 6 could not be synthesized, and thus its magnetic properties were not reported …”