Antiferromagnetic order inEuRh2(Ga,In)8

Abstract

We report the structural, magnetic, thermodynamic, and transport properties of EuRh 2 Ga 8 , EuRh 2 In 8 , and YbCo 2 Ga 8 . While the two former compounds show the onset of antiferromagnetic order at 20 and 5 K respectively, the latter remains nonmagnetic down to lowest temperatures. The electrical resistivity of the magnetic Eu-compounds is nearly unaffected by an external magnetic field, but the nonmagnetic YbCo 2 Ga 8 develops a positive magnetoresistance.

Strategic Crystal Growth and Physical Properties of Single-Crystalline LnCo2Al8 (Ln = La–Nd, Sm, Yb)

“…YbCo 2 Al 8 is diamagnetic down to 3 K, indicative of Yb in the 2+ oxidation state. This is consistent with the isostructural analogue YbCo 2 Ga 8 , 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 12 CeCo 2 Al 8 , where a broadening at ~45 K is observed. 11 The electrical resistivity of NdCo 2 Al 8 , as shown in the inset of Figure 8, decreases as a function of decreasing temperature followed by a slight curvature observed near 10 K close to the ordering temperature of T N = 8.6 K.…”

Magnetic ordering and crystal field effects in quasi-caged structure compound PrFe2Al8

“…It is to be noted that the value, γ 4f that we have obtained is through a subtraction procedure and actually assumes comparable lattice specific heats for the Pr and La compounds. The overall feature of the C p /T versus T 2 in the present case is similar to that of EuRh 2 In 8 where a transition at 5 K occurs first and further low in temperature, a broad anomaly occurs at 1.6 K [5]. The magnetic specific heat obtained by subtracting the C p (T ) of LaFe 2 Al 8 from that of PrFe 2 Al 8 displays a very broad peak centered at approximately 70 K (shown later in Fig.…”

“…A comparison of the different bond distances of both the compounds are collected in Table II. The typical Pr-Al distances in PrFe 2 Al 8 are found to be in the range of 3.09 Å to 3.36 Å, which is comparable to the distances observed for the Eu-pentagonal prism in EuRh 2 Ga 8 [5]. The Pr-Pr distances are found to be in the range 4.04 Å to 7.55 Å.…”

“…It was argued that the ground state of these compounds was governed by RKKY interaction [9] but possessed contrasting outcomes -in one case a metallic Fermi liquid state was evidenced whereas in the other, a heavy The figure was created using the software VESTA. [8] arXiv:1512.07488v1 [cond-mat.str-el] 23 Dec 2015 The refined lattice parameters are a ( Å) = 12.5098 (5), b ( Å) = 14.4410 (1), and c ( Å) = 4.0401 (7). The Uiso values were fixed to the values of PrCo2Al8 [11].…”

“…It has been found from previous studies that the reason lies in the ionic size of the R and the X. In the case of 1:1:5 and 2:1:8-stoichiometries, the R-ion is in the trivalent f 1 (Ce) state whereas in 1:2:8 systems, the rare earth is in divalent or mixed-valent state [5]. In Ce-based 1:2:8 systems, [1,6,7] Fermi-liquid with proximity to long-range magnetic order [7].…”