Giant uniaxial anisotropy in the magnetic and transport properties of CePd5Al2

Takahiro Onimaru, Yukihiro F. Inoue, Keisuke Shigetoh, Kazunori Umeo, Hirokazu Kubo, Raquel A. Ribeiro, Akihiro Ishida, Marcos A. Avila, Kenji Ohoyama, Masafumi Sera, Toshiro Takabatake

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Electrical resistivity ρ, magnetic susceptibility χ, magnetization M, and specific heat measurements are reported on a singlecrystalline sample of CePd5Al2, showing successive antiferromagnetic orderings at TN1 = 4.1 K and TN2 = 2.9 K. The temperature dependence of ρ shows a Kondo metal behavior with large anisotropy, ρca = 3.2 at 20 K, and opening of a superzone gap along the tetragonal c-direction below TN1. Both TN1 and TN2 gradually increase with applying pressure up to 2.5 GPa. The data of χ(T) and M(B) in the paramagnetic state were analyzed using a crystalline electric field (CEF) model. It led to a Kramers doublet ground state with wave functions consisting primarily of |±5/2〉, whose energy level is isolated from the excited states by 230 and 300 K. This CEF effect gives rise to the large anisotropy in the paramagnetic state. In the ordered state, the uniaxial magnetic anisotropy is manifested as Mc/M a = 20 in B = 5 T and at 1.9 K, and χca = 25 in B = 0.1 T and at 4 K. In powder neutron diffraction experiments, magnetic reflections were observed owing to the antiferromagnetic ordered states below TN1, whereas no additional reflection was found below TN2.

Original languageEnglish
Article number074708
Journaljournal of the physical society of japan
Volume77
Issue number7
DOIs
Publication statusPublished - 2008 Jul 1

Keywords

  • CePdAl
  • Crystalline electric field
  • Kondo lattice
  • Neutron diffraction
  • Superzone gap
  • Uniaxial anisotropy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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