Crystal structure and a giant magnetoresistance effect in the new zintl compound Eu 3Ga 2P 4

Naohito Tsujii, Catherine A. Uvarov, Peter Klavins, Tanghong Yi, Susan M. Kauzlarich

Research output: Contribution to journalArticle

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Abstract

Single-crystalline samples of a new Zintl compound, Eu 3Ga 2P 4, have been synthesized by a Ga-flux method. Eu 3Ga 2P 4 is found to crystallize in a monoclinic unit cell, space group C2/c, isostructural to Ca 3Al 2As 4. The structure is composed of a pair of edge-shared GaP 4 tetrahedra, which link by corner-sharing to form Ga 2P 4 two-dimensional layers, separated by Eu 2+ ions. Magnetic susceptibility showed a Curie-Weiss behavior with an effective magnetic moment consistent with the value for Eu 2+ magnetic ions. Below 15 K, ferromagnetic ordering was observed and the saturation magnetic moment was 6.6 μ B. Electrical resistivity measurements on a single crystal showed semiconducting behavior. Resistivity in the temperature range between 280 and 300 K was fit by an activation model with an energy gap of 0.552(2) eV. The temperature dependence of the resistivity is better described by the variable-range-hopping model for a three-dimensional conductivity, suggesting that Eu-P bonds are involved in the conductivity. A large magnetoresistance, up to -30%, is observed with a magnetic field H = 2 T at T = 100 K, suggesting strong coupling of carriers with the Eu 2+ magnetic moment.

Original languageEnglish (US)
Pages (from-to)2860-2866
Number of pages7
JournalInorganic Chemistry
Volume51
Issue number5
DOIs
StatePublished - Mar 5 2012

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Giant magnetoresistance
Magnetic moments
magnetic moments
Crystal structure
electrical resistivity
crystal structure
Ions
conductivity
Magnetoresistance
Magnetic susceptibility
tetrahedrons
ions
Energy gap
Chemical activation
Single crystals
activation
Magnetic fields
Fluxes
Crystalline materials
magnetic permeability

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Crystal structure and a giant magnetoresistance effect in the new zintl compound Eu 3Ga 2P 4 . / Tsujii, Naohito; Uvarov, Catherine A.; Klavins, Peter; Yi, Tanghong; Kauzlarich, Susan M.

In: Inorganic Chemistry, Vol. 51, No. 5, 05.03.2012, p. 2860-2866.

Research output: Contribution to journalArticle

Tsujii, N, Uvarov, CA, Klavins, P, Yi, T & Kauzlarich, SM 2012, 'Crystal structure and a giant magnetoresistance effect in the new zintl compound Eu 3Ga 2P 4 ', Inorganic Chemistry, vol. 51, no. 5, pp. 2860-2866. https://doi.org/10.1021/ic202018r
Tsujii, Naohito ; Uvarov, Catherine A. ; Klavins, Peter ; Yi, Tanghong ; Kauzlarich, Susan M. / Crystal structure and a giant magnetoresistance effect in the new zintl compound Eu 3Ga 2P 4 In: Inorganic Chemistry. 2012 ; Vol. 51, No. 5. pp. 2860-2866.
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