Intermediate valence state of Ce in the novel quaternary compound CeRu2Sn2Zn18

• Published in: Journal of alloys and compounds Vol. 797; pp. 309 - 313
• Main Authors: Wakiya, Kazuhei, Sugiyama, Yuki, Komagata, Takahiro, Uehara, Masatomo, Sato, Hiroyasu, Gouchi, Jun, Uwatoko, Yoshiya, Umehara, Izuru
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.08.2019; Elsevier BV
• Subjects: [formula omitted]Sn2Zn18; Cerium; Cerium intermetallics; Crystal structure; Intermediate valence state; Lanthanum; Magnetic flux; Magnetic permeability; Magnetic properties; Phase transitions; RT2X20; Single crystals; Specific heat; Structural analysis; Transport properties; Valence; RT2Sn2Zn18; RT2X20; Cerium intermetallics; Intermediate valence state; Magnetic properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.04.345

A novel quaternary compound CeRu2Sn2Zn18 has been synthesized by a self-flux method. The structural, magnetic, and transport properties have been studied using single crystal X-ray structural analysis and measurements of the electrical resistivity ρ, specific heat C, and magnetic susceptibility χ. The X-ray structural analysis reveals that CeRu2Sn2Zn18 is an ordered variant of the CeCr2Al20- and ZrZn22-types, as found in the isostructural RT2Sn2Zn18 (R = La, Ce, Pr, Nd, T = Fe, Co, Ru). ρ shows no sign of a phase transition down to 2 K and is proportional to T2 below 50 K. χ exhibits a broad peak near 100 K, and the values are on the order of 10−3 emu/mol over a temperature range of 2–300 K. The electronic specific heat coefficient γ is found to be 69 mJ/K2 mol, which is approximately seven-fold larger than that of the La analog. These findings indicate that CeRu2Sn2Zn18 is in the intermediate valence state. •The novel quaternary compound CeRu2Sn2Zn18 has been synthesized by the self-flux method.•CeRu2Sn2Zn18 is a quaternary variant of cubic CeCr2Al20-type.•CeRu2Sn2Zn18 exhibits an intermediate valence state.