Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca1xSrxCo2yAs2

Bing Li, Y. Sizyuk, N. S. Sangeetha, J. M. Wilde, P. Das, W. Tian, D. C. Johnston, A. I. Goldman, A. Kreyssig, P. P. Orth, R. J. McQueeney, and B. G. Ueland
Phys. Rev. B 100, 024415 – Published 15 July 2019

Abstract

In search of a quantum phase transition between the two-dimensional (2D) ferromagnetism of CaCo2yAs2 and stripe-type antiferromagnetism in SrCo2As2, we instead find evidence for 1D magnetic frustration between magnetic square Co layers. We present neutron-diffraction data for Ca1xSrxCo2yAs2 that reveal a sequence of x-dependent magnetic transitions which involve different stacking of 2D ferromagnetically aligned layers with different magnetic anisotropy. We explain the x-dependent changes to the magnetic order by utilizing classical analytical calculations of a 1D Heisenberg model where single-ion magnetic anisotropy and frustration of antiferromagnetic nearest- and next-nearest-layer exchange interactions are all composition dependent.

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  • Received 10 April 2019
  • Revised 26 June 2019

DOI:https://doi.org/10.1103/PhysRevB.100.024415

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Bing Li1,2, Y. Sizyuk1,2, N. S. Sangeetha1, J. M. Wilde1,2, P. Das1,2,*, W. Tian3, D. C. Johnston1,2, A. I. Goldman1,2, A. Kreyssig1,2, P. P. Orth1,2, R. J. McQueeney1,2,†, and B. G. Ueland1,2,‡

  • 1Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *Present Address: Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA.
  • rmcqueen@ameslab.gov
  • bgueland@ameslab.gov

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Issue

Vol. 100, Iss. 2 — 1 July 2019

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