Investigation of Effect of Hole Doping on the Magnetic and Structural Behavior of CaCo₂As₂

Samuel Adegboyega, Michael Shatruk

Florida State University. Tallahassee, FL 32306

CaCo₂As₂ offers a rare example of nearly ideal spin frustration on a square lattice. This material, which crystallizes in the ThrCr₂Si₂ structure type (space group I4/mmm), shows antiferromagnetic (AFM) ordering at T_N = 74 K.^1,2 It has been shown by our group and other groups that electron doping by substitution of La for Ca ³ or Ni for Co ⁴ leads to suppression of AFM ordering in favor of a ferromagnetic (FM) ground state. In contrast, the effect of hole doping on the magnetic properties of this CaCo₂As₂ has not been investigated. In this contribution, we report initial results of our studies of the CaCo_2–xFe_xAs₂ series (0 ≤ x ≤ 1). In particulate, the initial hole doping causes a slight decrease in the AFM ordering temperature, which was found to be equal to 65 K in CaCo_1.8Fe_0.2As₂. The change in the crystal structure parameters and their correlation with magnetic properties will also be discussed.

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