Incommensurate mgnetism in FeAs srips: Neutron sattering from CaFe 4As3

Yusuke Nambu, Liang L. Zhao, Emilia Morosan, Kyoo Kim, Gabriel Kotliar, Pawel Zajdel, Mark A. Green, William Ratcliff, Jose A. Rodriguez-Rivera, Collin Broholm

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17 Citations (Scopus)


Magnetism in the orthorhombic metal CaFe4As3 was examined through neutron diffraction for powder and single crystalline samples. Incommensurate [qm≈(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 qm to 0.375(2)b*, and increasing the moments from 2.1(1) to 2.2(3) μB 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.

Original languageEnglish
Article number037201
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 2011 Jan 18


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