Anisotropic behavior of magnetic and transport properties in CePdSb and CePtSb

Kenichi Katoh, Toshiro Takabatake, Isamu Oguro, Akira Ochiai, Akihiro Uesawa, Takashi Suzuki

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Measurements of resistivity ρ, Hall coefficient RH, magnetic susceptibility χ, magnetization, specific heat C and magnetoresistance have been performed on the hexagonal ferromagnets CeTSb (T=Pd, Pt) and the isostructural compounds LaTSb using single crystalline samples. Strong anisotropy in ρ, ρc > ρa, was observed for both the Ce compounds as well as the La compounds. However, RH(T) for CeTSb does not exhibit strong anisotropy between H∥a and H∥c. The anisotropic behavior of χ(T) for the Ce compounds is well reproduced by the crystalline electronic-field model. The analysis of χ(T) suggests that the ferromagnetic exchange interaction along the c axis in CePdSb is much stronger than that in CePtSb. Magnetization measurements reveal that the saturated magnetic moments of 1.32μB and 0.91 μB for CePdSb and CePtSb lie within the c plane in the ferromagnetic state. The C(T) for CePdSb shows a clear jump at TC = 17.5 K in addition to a broad peak around 10 K. These results suggest that one dimensional magnetic order along the c axis occurs in CePdSb at TC = 17.5 K and three-dimensional order develops only below 10 K. It is found that ρc increases below 8 K and 6K for CePdSb and CePtSb, respectively, and RH(H∥a, I∥c) also increases below 10 K for both compounds. Unlike usual ferromagnets, the transverse and longitudinal magnetoresistances in the ferromagnetic states are largely positive for H∥a. These unusual transport properties may be ascribed to the anomalous spin dynamics in the ferromagnetic state of the present systems.

Original languageEnglish
Pages (from-to)613-619
Number of pages7
Journaljournal of the physical society of japan
Volume68
Issue number2
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

Keywords

  • CePdSb
  • CePtSb
  • Electrical resistivity
  • Hall coefficient
  • Magnetic susceptibility
  • Magnetization
  • Specific heat

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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