Weak hybridization and isolated localized magnetic moments in the compounds CeT$_2$Cd$_{20}$ (T = Ni, Pd)

ORAL

Abstract

Large Ce-Ce distances of 6.7-6.8~\AA~and weak hybridization between Ce 4$f$ and itinerant electron states act to promote stable localized magnetic moments in the compounds CeT$_2$Cd$_{20}$ (T = Ni, Pd), but also conspire to severely limit the strength of the Ruderman-Kittel-Kasuya-Yosida (RKKY) magnetic exchange interaction that couples them. As a consequence, measurements of electrical resistivity, performed on single-crystalline samples of these new Cd-based compounds down to 0.138 K, were unable to resolve any evidence for magnetic order. In this presentation, we will compare measurements of the physical properties of CeT$_2$Cd$_{20}$ (T = Ni, Pd) under ambient and applied pressures with the reported properties of the isostructural compounds CeT$_2$X$_{20}$ (T = transition metal; X = Al, Zn). We will use these comparisons to discuss the interplay of unit cell volume, hybridization, and the RKKY interaction and its role in establishing the ground states of the Ce-based ``1-2-20'' compounds.

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Authors

  • B. White

    University of California, San Diego, Physics Department, UC San Diego, Department of Physics, University of California, San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA

  • D. Yazici

    Physics Department, UC San Diego, Department of Physics, University of California, San Diego, UC, San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA

  • P.-C. Ho

    Department of Physics, California State University, Fresno, Physics/CSU-Fresno

  • Noravee Kanchanavatee

    Department of Physics, University of California, San Diego

  • Naveen Pouse

    Physics Department, UC San Diego, Department of Physics, University of California, San Diego

  • Aaron Friedman

    Department of Physics, University of California, San Diego

  • Brian Maple

    University of California, San Diego, Physics Department, UC San Diego, Department of Physics, University of California, San Diego, Physics/UC San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA, Department. of Physics, U. of California, San Diego