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EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet

The Eu spins-7/2 in EuCo2P2 with the tetragonal ThCr2Si2-type structure have the prototypical noncollinear helical antiferromagnetic structure below the Neel temperature TN = 66.5 K as previously determined from single-crystal neutron diffraction measurements. The helix axis is along the c axis with the ordered moments aligned within the ab plane. Our recent formulation of molecular field theory (MFT) is found to quantitatively fit the anisotropic magnetic susceptibility of single-crystal EuCo2P2 at T < TN with a helix turn angle comparable to the neutron diffraction value. The experimental and MFT magnetic heat capacities at T < TN are also in good agreement. Values of the Heisenberg exchange interactions between the Eu spins-7/2 within the J0-Jz1-Jz2 MFT model are derived. The results demonstrate the robust applicability of the MFT to model the thermodynamic properties of noncollinear Heisenberg antiferromagnets.

preprint2015arXivOpen access
N. S. SangeethaAbhishek PandeyD. C. Johnston
cond-mat.str-el
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N. S. SangeethaAbhishek PandeyD. C. Johnston

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