paper

Suppression of magnetic order in CaCo $_{1.86}$ As $_{2}$ with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co $_{1 - x}$ Fe $_{x}$ ) $_{y}$ As $_{2}$

arXiv:1702.02104 · doi:10.1103/PhysRevB.95.064425

Abstract

Magnetization, neutron diffraction, and high-energy x-ray diffraction results for Sn-flux grown single-crystal samples of Ca(Co $_{1 - x}$ Fe $_{x}$ ) $_{y}$ As $_{2}$ , $0 \leq x \leq 1$ , $1.86 \leq y \leq 2$ , 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 NÃ©el temperature linearly decreasing. Stripe-type antiferromagnetic order does not occur for $x \leq 0.25$ , nor does ferromagnetic order for $x$ up to at least $x = 0.104$ , and a smooth crossover from the collapsed-tetragonal (cT) phase of CaCo $_{1.86}$ As $_{2}$ to the tetragonal (T) phase of CaFe $_{2}$ As $_{2}$ occurs. These results suggest that hole doping CaCo $_{1.86}$ As $_{2}$ has a less dramatic effect on the magnetism and structure than steric effects due to substituting Sr for Ca.

12 pages, 16 Figures

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

Abstract

Suppression of magnetic order in CaCo $_{1.86}$ As $_{2}$ with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co $_{1 - x}$ Fe $_{x}$ ) $_{y}$ As $_{2}$