Incommensurate magnetism in FeAs strips: neutron scattering from CaFe(4)As(3) |
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Authors: | Nambu Yusuke Zhao Liang L Morosan Emilia Kim Kyoo Kotliar Gabriel Zajdel Pawel Green Mark A Ratcliff William Rodriguez-Rivera Jose A Broholm Collin |
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Affiliation: | Institute for Quantum Matter and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA. |
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Abstract: | Magnetism in the orthorhombic metal CaFe(4)As(3) was examined through neutron diffraction for powder and single crystalline samples. Incommensurate [q(m) ≈ (0.37-0.39) × b*] and predominantly longitudinally (|| b) modulated order develops through a 2nd order phase transition at TN = 89.63(6) K with a 3D Heisenberg-like critical exponent β = 0.365(6). A 1st order transition at T2 = 25.6(9) K is associated with the development of a transverse component, locking q(m) to 0.375(2)b*, and increasing the moments from 2.1(1) to 2.2(3) μ B for Fe2+ and from 1.3(3) to 2.4(4) μB for Fe+. The ab initio Fermi surface is consistent with a nesting instability in cross-linked FeAs strips. |
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