Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3

P. Manuel, L. C. Chapon, I. S. Todorov, D. Y. Chung, J. P. Castellan, S. Rosenkranz, R. Osborn, P. Toledano, M. G. Kanatzidis

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17 Citations (Scopus)

Abstract

The magnetic structure for the recently synthesized iron-arsenide compound CaFe4As3 has been studied by neutron-powder diffraction. Long-range magnetic order is detected below 85 K, with an incommensurate modulation described by the propagation vector k= (0,δ,0), δ∼0.39. Below ∼25 K, our measurements detect a first-order phase transition where δ locks into the commensurate value 3/8. A model of the magnetic structure is proposed for both temperature regimes, based on Rietveld refinements of the powder data and symmetry considerations. The structures correspond to longitudinal spin-density waves with magnetic moments directed along the b axis. A Landau analysis captures the change in thermodynamic quantities observed at the two magnetic transitions, in particular, the drop in resistivity at the lock-in transition.

Original languageEnglish
Article number184402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number18
DOIs
Publication statusPublished - May 3 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Manuel, P., Chapon, L. C., Todorov, I. S., Chung, D. Y., Castellan, J. P., Rosenkranz, S., Osborn, R., Toledano, P., & Kanatzidis, M. G. (2010). Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3. Physical Review B - Condensed Matter and Materials Physics, 81(18), [184402]. https://doi.org/10.1103/PhysRevB.81.184402