Drastic Decrease of the Curie Temperature in the Solid Solution GdRu_xCd_1–x

Abstract

Five samples of solid solutions GdRu x Cd 1−x extending up to x ≈ 0.25 were synthesized by induction-melting of the elements in sealed tantalum tubes. According to X-ray powder diffraction data, the GdRu x Cd 1−x samples crystallize with the cubic CsCl structure. The structures of two crystals were refined from diffractometer data: Pm3m, a = 372.41(4) pm, wR2 = 0.0363, 45 F 2 , 5 variables for GdRu 0.10(1) Cd 0.90(1) and a = 367.70(4) pm, wR2 = 0.0301, 39 F 2 , 5 variables for GdRu 0.20(1) Cd 0.80(1) . The cadmium-ruthenium substitution has a drastic effect on the magnetic properties. All samples order ferromagnetically, however, the Curie temperature decreases drastically from 258 K for GdCd to 63.6 K for GdRu 0.20 Cd 0.80 with a Vegard-type behavior.

Magnetic properties and tuneable magnetocaloric effect with large temperature span in GdCd1−xRux solid solutions

“…The reciprocal susceptibility shows CurieeWeiss behaviour above 250 K. The effective magnetic moment is 7.79, 7.51, and 7.89 m B /Gd for x ¼ 0.1, 0.15, and 0.2, respectively, which is close to that of the free ion value of Gd 3þ (7.94 m B ) and consistent with earlier reported results [12].…”

“…The magnetic measurements were performed with a vibrating sample magnetometer (VSM) which is an option of the physical property measurement system (PPMS-9, Quantum Design) with DC magnetic field up to 7 T from 3 to 300 K. Fig. 1 shows the temperature dependence of zero field cooling (ZFC) and field cooling (FC) magnetization M for GdCd 1Àx Ru x (x ¼ 0.1, 0.15, and 0.2) under a low magnetic field of H ¼ 0.1 T. A typical paramagnetic to ferromagnetic (PM-FM) transition can be observed around the Curie temperature T C~1 49, 108, and 73 K for x ¼ 0.1, 0.15, and 0.2, respectively, which is consistent with the reported values by Tappe et al [12]. No obvious thermal hysteresis can be observed between ZFC and FC MeT curves which is usually the case in magnetic materials with a second order magnetic transition and benefit for application.…”

“…A more detailed description of the sample preparation and phase analysis are given in Ref. [12]. The magnetic measurements were performed with a vibrating sample magnetometer (VSM) which is an option of the physical property measurement system (PPMS-9, Quantum Design) with DC magnetic field up to 7 T from 3 to 300 K. Fig.…”

“…Among all the RE x T y compounds, the MCE in Gd-based materials [7e10] have been extensively investigated owing to the fact that the Gd ion has the largest magnetic moment and no orbital moment in its ground state [11], which makes it simple to understand the magnetic and MCE properties of the respective compounds. Recently, we have reported the crystal chemistry and some primary magnetic properties for the CsCl type solid solution GdCd 1Àx Ru x , i. e. a strong decrease of the magnetic ordering temperature from 258 K (GdCd) to 64 K (GdCd 0.8 Ru 0.2 ) was observed [12]. In the present study, the magnetic and magnetocaloric properties in the solid solutions GdCd 1Àx Ru x (x ¼ 0.1, 0.15, and 0.2) have been systematically investigated.…”

Osmium and magnesium: structural segregation in the rare earth-rich intermetallics RE 4OsMg (RE=La–Nd, Sm) and RE 9 TMg4 (RE=Gd, Tb)

“…This is exactly the problem for the Gd 9 OsMg 4 and Tb 9 OsMg 4 samples studied herein and a deeper interpretation of the magnetically ordered regime is not appropriate. The dependence of the Curie temperature on the composition of such CsCl-type phases was exemplarily studied for the solid solution GdRu x Cd 1−x which extends up to x ≈ 0.25 and shows a continuous decrease of T C from 258 K for GdCd to 61.5 K for GdRu 0.20 Cd 0.80 [39,40].…”