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

doi:10.1103/PhysRevB.81.184402

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

Northwestern University

Research output: Contribution to journal › Article

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 language	English
Article number	184402
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.81.184402
Publication status	Published - 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

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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.",

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AU - Manuel, P.

AU - Chapon, L. C.

AU - Todorov, I. S.

AU - Chung, D. Y.

AU - Castellan, J. P.

AU - Rosenkranz, S.

AU - Osborn, R.

AU - Toledano, P.

AU - Kanatzidis, M. G.

PY - 2010/5/3

Y1 - 2010/5/3

N2 - 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.

AB - 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.

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