Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet CaCo2-yAs2

Sapkota, A.; Ueland, B. G.; Anand, V. K.; Sangeetha, N. S.; Abernathy, Douglas L.; Stone, Matthew B.; Niedziela, Jennifer L.; Johnston, D. C.; Kreyssig, A.; Goldman, A. I.; McQueeney, R. J.

doi:10.1103/PhysRevLett.119.147201

Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet ${CaCo}_{2 - y} {As}_{2}$

Journal Article · Mon Oct 02 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.147201· OSTI ID:1406559

Sapkota, A. ^[1]; Ueland, B. G. ^[1]; Anand, V. K. ^[2]; Sangeetha, N. S. ^[1]; ^[3]; ^[3]; ^[4]; Johnston, D. C. ^[1]; Kreyssig, A. ^[1]; Goldman, A. I. ^[1]; McQueeney, R. J. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Ames Lab. and Iowa State Univ., Ames, IA (United States); Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division

Inelastic neutron scattering measurements on the itinerant antiferromagnet CaCo_2–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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358; AC05-00OR22725

OSTI ID:: 1406559

Report Number(s):: IS-J--9471

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 119; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca 1 − x Sr x Co 2 − y As 2 Li, Bing; Sizyuk, Y.; Sangeetha, N. S. Physical Review B, Vol. 100, Issue 2 https://doi.org/10.1103/physrevb.100.024415	journal	July 2019
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Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet ${CaCo}_{2 - y} {As}_{2}$