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, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

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

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Spin density waves
Magnetic structure
Rietveld refinement
Neutron powder diffraction
Magnetic moments
Powders
Iron
Phase transitions
Modulation
Thermodynamics
magnetic moments
modulation
iron
neutrons
thermodynamics
electrical resistivity
propagation
symmetry
diffraction
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3. / Manuel, P.; Chapon, L. C.; Todorov, I. S.; Chung, D. Y.; Castellan, J. P.; Rosenkranz, S.; Osborn, R.; Toledano, P.; Kanatzidis, Mercouri G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 18, 184402, 03.05.2010.

Research output: Contribution to journalArticle

Manuel, P, Chapon, LC, Todorov, IS, Chung, DY, Castellan, JP, Rosenkranz, S, Osborn, R, Toledano, P & Kanatzidis, MG 2010, 'Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3', Physical Review B - Condensed Matter and Materials Physics, vol. 81, no. 18, 184402. https://doi.org/10.1103/PhysRevB.81.184402
Manuel, P. ; Chapon, L. C. ; Todorov, I. S. ; Chung, D. Y. ; Castellan, J. P. ; Rosenkranz, S. ; Osborn, R. ; Toledano, P. ; Kanatzidis, Mercouri G. / Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 18.
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AU - Castellan, J. P.

AU - Rosenkranz, S.

AU - Osborn, R.

AU - Toledano, P.

AU - Kanatzidis, Mercouri G

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