Crystal and magnetic structure of CaCo1.86As2 studied by x-ray and neutron diffraction

D. G. Quirinale; V. K. Anand; M. G. Kim; Abhishek Pandey; A. Huq; P. W. Stephens; T. W. Heitmann; A. Kreyssig; R. J. McQueeney; D. C. Johnston; A. I. Goldman

doi:10.1103/PhysRevB.88.174420

Crystal and magnetic structure of CaCo_1.86As₂ studied by x-ray and neutron diffraction

D. G. Quirinale, V. K. Anand, M. G. Kim, Abhishek Pandey, A. Huq, P. W. Stephens, T. W. Heitmann, A. Kreyssig, R. J. McQueeney, D. C. Johnston, A. I. Goldman

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Abstract

Neutron and x-ray diffraction measurements are presented for powders and single crystals of CaCo₂As₂. The crystal structure is a collapsed-tetragonal ThCr₂Si₂-type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition CaCo_1.86(2)As₂. The thermal expansion coefficients for both the a and c axes are positive from 10 to 300 K. Neutron diffraction measurements on single crystals demonstrate the onset of A-type collinear antiferromagnetic order below the Néel temperature T _N=52(1) K with the ordered moments directed along the tetragonal c axis, aligned ferromagnetically in the ab plane and antiferromagnetically stacked along the c axis.

Original language	English
Article number	174420
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	88
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.88.174420
State	Published - Nov 25 2013
Externally published	Yes

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Quirinale, D. G., Anand, V. K., Kim, M. G., Pandey, A., Huq, A., Stephens, P. W., Heitmann, T. W., Kreyssig, A., McQueeney, R. J., Johnston, D. C., & Goldman, A. I. (2013). Crystal and magnetic structure of CaCo_1.86As₂ studied by x-ray and neutron diffraction. Physical Review B - Condensed Matter and Materials Physics, 88(17), Article 174420. https://doi.org/10.1103/PhysRevB.88.174420

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title = "Crystal and magnetic structure of CaCo1.86As2 studied by x-ray and neutron diffraction",

abstract = "Neutron and x-ray diffraction measurements are presented for powders and single crystals of CaCo2As2. The crystal structure is a collapsed-tetragonal ThCr2Si2-type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition CaCo1.86(2)As2. The thermal expansion coefficients for both the a and c axes are positive from 10 to 300 K. Neutron diffraction measurements on single crystals demonstrate the onset of A-type collinear antiferromagnetic order below the N{\'e}el temperature T N=52(1) K with the ordered moments directed along the tetragonal c axis, aligned ferromagnetically in the ab plane and antiferromagnetically stacked along the c axis.",

author = "Quirinale, {D. G.} and Anand, {V. K.} and Kim, {M. G.} and Abhishek Pandey and A. Huq and Stephens, {P. W.} and Heitmann, {T. W.} and A. Kreyssig and McQueeney, {R. J.} and Johnston, {D. C.} and Goldman, {A. I.}",

year = "2013",

month = nov,

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doi = "10.1103/PhysRevB.88.174420",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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T1 - Crystal and magnetic structure of CaCo1.86As2 studied by x-ray and neutron diffraction

AU - Quirinale, D. G.

AU - Anand, V. K.

AU - Kim, M. G.

AU - Pandey, Abhishek

AU - Huq, A.

AU - Stephens, P. W.

AU - Heitmann, T. W.

AU - Kreyssig, A.

AU - McQueeney, R. J.

AU - Johnston, D. C.

AU - Goldman, A. I.

PY - 2013/11/25

Y1 - 2013/11/25

N2 - Neutron and x-ray diffraction measurements are presented for powders and single crystals of CaCo2As2. The crystal structure is a collapsed-tetragonal ThCr2Si2-type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition CaCo1.86(2)As2. The thermal expansion coefficients for both the a and c axes are positive from 10 to 300 K. Neutron diffraction measurements on single crystals demonstrate the onset of A-type collinear antiferromagnetic order below the Néel temperature T N=52(1) K with the ordered moments directed along the tetragonal c axis, aligned ferromagnetically in the ab plane and antiferromagnetically stacked along the c axis.

AB - Neutron and x-ray diffraction measurements are presented for powders and single crystals of CaCo2As2. The crystal structure is a collapsed-tetragonal ThCr2Si2-type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition CaCo1.86(2)As2. The thermal expansion coefficients for both the a and c axes are positive from 10 to 300 K. Neutron diffraction measurements on single crystals demonstrate the onset of A-type collinear antiferromagnetic order below the Néel temperature T N=52(1) K with the ordered moments directed along the tetragonal c axis, aligned ferromagnetically in the ab plane and antiferromagnetically stacked along the c axis.

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DO - 10.1103/PhysRevB.88.174420

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 17

M1 - 174420

ER -

Crystal and magnetic structure of CaCo_1.86As₂ studied by x-ray and neutron diffraction

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