Suppression of magnetic order in CaCo1.86As2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co1-xFex)(y)As-2

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTIVITY;    PHOSPHIDES CACO2P2;    THCR2SI2 STRUCTURE;    TERNARY ARSENIDES;    IRON;    TRANSITION;    BREAKING;    BAFE2AS2;    CRYSTAL;   

DOI  :  10.1103/PhysRevB.95.064425

来源: SCIE

【 摘 要 】

Magnetization, neutron diffraction, and high-energy x-ray diffraction results for Sn-flux grown single-crystal samples of Ca(Co1-xFex)(y)As-2, 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 less than or similar to 0.12(1). The antiferromagnetic order is smoothly suppressed with increasing x, with both the ordered moment and Neel 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.

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