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

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

doi:10.1103/PhysRevB.95.064425

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

Journal Article · Thu Feb 23 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.064425· OSTI ID:1347399

Jayasekara, W. T. ^[1]; Pandey, Abhishek ^[2]; Kreyssig, A. ^[1]; Sangeetha, N. S. ^[1]; Sapkota, A. ^[1]; Kothapalli, K. ^[1]; Anand, V. K. ^[3]; Tian, W. ^[4]; Vaknin, D. ^[1]; Johnston, D. C. ^[1]; McQueeney, R. J. ^[1]; Goldman, A. I. ^[1]; Ueland, B. G. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Texas A & M Univ., College Station, TX (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Magnetization, neutron diffraction, and high-energy x-ray diffraction results for Sn-flux grown single-crystal samples of Ca(Co_1–xFe_x)_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 CaCo_1.86As₂ to the tetragonal (T) phase of CaFe₂As₂ occurs. Furthermore, these results suggest that hole doping CaCo_1.86As₂ has a less dramatic effect on the magnetism and structure than steric effects due to substituting Sr for Ca.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; AC02-06CH11357

OSTI ID:: 1347399

Alternate ID(s):: OSTI ID: 1344816

Report Number(s):: IS-J-9213; PRBMDO; TRN: US1700689

Journal Information:: Physical Review B, Vol. 95, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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