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 language | English |
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Article number | 064425 |
Journal | Physical Review B |
Volume | 95 |
Issue number | 6 |
DOIs | |
State | Published - Feb 23 2017 |