Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet CaCo 2 − y As 2

Date
2017-10-02
Authors
Sapkota, Aashish
Ueland, B.
Anand, V.
Sangeetha, N.
Abernathy, D.
Stone, M.
Niedziela, J.
Johnston, D.
Kreyssig, A.
Goldman, A.
McQueeney, R.
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Altmetrics
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Ames Laboratory
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Physics and Astronomy
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Abstract

Inelastic neutron scattering measurements on the itinerant antiferromagnet CaCo2−yAs2 at a temperature of 8 K reveal two orthogonal planes of scattering perpendicular to the Co square lattice in reciprocal space, demonstrating the presence of effective one-dimensional spin interactions. These results are shown to arise from near-perfect bond frustration within the J1-J2 Heisenberg model on a square lattice with ferromagnetic J1 and hence indicate that the extensive previous experimental and theoretical study of the J1-J2 Heisenberg model on local-moment square spin lattices should be expanded to include itinerant spin systems.

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frustrated magnetism, magnetism, superconductivity
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