Suppression of magnetic order in CaCo1.86As2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co1-xFex)yAs2

W. T. Jayasekara, Abhishek Pandey, A. Kreyssig, N. S. Sangeetha, A. Sapkota, K. Kothapalli, V. K. Anand, W. Tian, D. Vaknin, D. C. Johnston, R. J. McQueeney, A. I. Goldman, B. G. Ueland

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    Abstract

    Magnetization, neutron diffraction, and high-energy x-ray diffraction results for Sn-flux grown single-crystal samples of Ca(Co1-xFex)yAs2, 0≤x≤1, 1.86≤y≤2, are presented and reveal that A-type antiferromagnetic order, with ordered moments lying along the c axis, persists for x 0.12(1). The antiferromagnetic order is smoothly suppressed with increasing x, with both the ordered moment and Néel temperature linearly decreasing. Stripe-type antiferromagnetic order does not occur for x≤0.25, nor does ferromagnetic order for x up to at least x=0.104, and a smooth crossover from the collapsed-tetragonal (cT) phase of CaCo1.86As2 to the tetragonal (T) phase of CaFe2As2 occurs. These results suggest that hole doping CaCo1.86As2 has a less dramatic effect on the magnetism and structure than steric effects due to substituting Sr for Ca.

    Original languageEnglish
    Article number064425
    JournalPhysical Review B
    Volume95
    Issue number6
    DOIs
    StatePublished - Feb 23 2017

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