title: Emergence of Magnetic States in Pr2Fe(4-x)Co(x)Sb5 (1 < x < 2.5).
abstract: Single crystals of Pr2Fe(4-x)Co(x)Sb5 (1 < x < 2.5) were grown from a Bi flux and characterized by X-ray diffraction. The compounds adopt the La2Fe4Sb5 structure type (I4/mmm). The structure of Pr2Fe(4-x)Co(x)Sb5 (1 < x < 2.5) contains a network of transition metals forming isosceles triangles. The x ∼ 1 analogue is metallic and exhibits a magnetic transition at T1 ≈ 25 K. The magnetic moment obtained from the Curie-Weiss fit is 11.49(4) μ(B), which is larger than the spin-only Pr(3+) moment. The x ∼ 2 analogue orders magnetically at T1 ≈ 80 and T2 ≈ 45 K. This is the first case of the substitution of Co into the La2Fe4Sb5 structure type, evidenced by the increased concentration of dopant with decreased lattice parameters coupled with a change in the transition temperature with a change in the cobalt concentration. The added complexity in the magnetic behavior of the x ∼ 1 and 2 analogues indicates that the increased concentration of Co invokes an additional magnetic contribution of the transition metal in the sublattice. Furthermore, X-ray photoelectron spectroscopy measurements support the change in the oxidation states of transition metals with increasing cobalt concentration.
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Pilanda
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authors: Watkins-Curry
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Kyle J
authors: KJ
authors: Pujol
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Katherine A
authors: KA
authors: Benavides
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Joseph Vade
authors: JV
authors: Burnett
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Jenny K
authors: JK
authors: Hedlund
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Julia
authors: J
authors: Bykova
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Gregory T
authors: GT
authors: McCandless
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Amy V
authors: AV
authors: Walker
authors: Department of Chemistry & Biochemistry, §Department of Materials Science and Engineering, and ‡Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors: Julia Y
authors: JY
authors: Chan