Competing exchange interactions in lanthanide triangular lattice compounds ln Zn3P3(Ln = La-Nd, Sm, Gd)

Noriyuki Kabeya, Tomohiro Sakamoto, Katsuya Hara, Yuta Hara, Shintaro Nakamura, Kenichi Katoh, Akira Ochiai

Research output: Contribution to journalArticlepeer-review

Abstract

Stacked triangular lanthanide compounds LnZn3P3(Ln = La-Nd, Sm, Gd) are successfully grown as single-crystalline samples. Magnetic-susceptibility and specific-heat measurements reveal that the compounds with Ce, Nd, and Gd show long-range order at 0.78, 0.63, and 4.7 K, respectively, while two successive transitions are found in SmZn3P3at 0.34 and 0.82 K. The light lanthanide compounds LnZn3P3(Ln = La-Pr) behave as semiconductors in terms of electrical resistivity, while heavier lanthanide compounds (Ln = Nd, Sm, Gd) show metallic conductivity. This family of compounds provides an excellent opportunity to study the effects of conduction electrons in rare-earth triangular-lattice magnets. The ordering temperatures of the metallic compounds are almost proportional to the de-Gennes factor of those trivalent lanthanide ions. In contrast, the semiconductor compound CeZn3P3shows a much higher ordering temperature than that estimated from the de-Gennes factor. Our results indicate that even with a low density of conduction electrons, the Ruderman-Kittel-Kasuya-Yosida interaction possibly has a comparable magnitude to the superexchange interaction and shows the potential to remove geometrical frustration.

Original languageEnglish
Article number074707
Journaljournal of the physical society of japan
Volume89
Issue number7
DOIs
Publication statusPublished - 2020 Jul

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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