Unusual nature of electronic and magnetic states of Sm1.85Ce0.15CuO4-δ

B. K. Cho, Jae Hoon Kim, Young Jin Kim, O. Beom-hoan, J. S. Kim, G. R. Stewart

Research output: Contribution to journalArticle

Abstract

Temperature-dependent magnetization (M(T)) and specific heat (CP(T)) measurements were carried out on single-crystal Sm1.85Ce0.15CuO4-δ (TC=16.5K). The magnetic anisotropy in the static susceptibility, x = M/H, is apparent not only in its magnitude but also in its temperature dependence, with Χ for H ⊥ c larger than Χ for H ∥ c. For both field orientations, Χ does not follow the Curie-Weiss behavior due to the small energy gap of the J = 7/2 multiplet above the J = 5/2 ground-state multiplet. However, with increasing temperature, Χ(T) exhibits a broad minimum near 100 K and then a slow increase while Χ(T) shows a monotonic decrease. A sharp peak in CP(T) at 4.7 K manifests an antiferromagnetic ordering. The electronic contribution, 7, to CP(T) is estimated to be γ = 103.2 (7) mJ/mole·Sm·K2. The entropy associated with the magnetic ordering is much smaller than Rln2, where R is the gas constant, which is usually expected for the doublet ground state of Sm+3. The unusual magnetic and electronic properties evident in M(T) and CP(T) are probably due to a strong anisotropic interaction between conduction electrons and localized electrons at Sm+3 sites.

Original languageEnglish
Pages (from-to)491-492
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume341-348
Issue numberPART 1
DOIs
Publication statusPublished - 2000 Jan 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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