Structure, magnetism, and magnetoresistance of the rare-earth transition metal compounds Eu13AMnSb11 (A = Ca, Sr, Ba, and Yb)

Hyungrak Kim, Peter Klavins, Susan M. Kauzlarich

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28 Scopus citations

Abstract

The effect of four different dopants (Ca, Sr, Ba, and Yb) on the structural and physical properties of the ternary rare-earth transition metal compound, Eu14MnSb11, has been investigated. The compounds, Eu14-xAxMnSb11 (A = Ca, Sr, Ba, and Yb, x = 1), have been prepared by heating the mixture of stoichiometric amounts of the elements, sealed in a quartz jacketed Ta tube, in a two-zone furnace with Thigh = 1100°C and Tlow = 1050°C for 10 days. These compounds are isostructural with the Zintl compound Ca14AlSb11 and crystallize in the tetragonal space group I41/acd, Z = 8. The lattice parameters of the doped compound increase correspondingly as the radius of the metal dopant (A2+) increases. The preference of the dopants onto the four crystallographically inequivalent sites of Eu was examined by single-crystal X-ray diffraction. The magnetization of the compounds has been measured as a function of temperature and applied magnetic field. Temperature-dependent magnetic susceptibility measurement of powder samples reveals different magnetization processes for the four doped systems corresponding to the site preference of each dopant in Eu13AMnSb11. The magnetotransport property of one of the compounds, Eu13BaMnSb11 was measured for 2 ≤ T ≤ 150 K in an applied magnetic field up to 6 T. A large negative magnetoresistance effect was observed in the temperature region and is compared to the results for Eu14MnSb11 and Eu13CaMnSb11.

Original languageEnglish (US)
Pages (from-to)2308-2316
Number of pages9
JournalChemistry of Materials
Volume14
Issue number5
DOIs
StatePublished - 2002

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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