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

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

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 (US)
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
State	Published - May 3 2010

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.81.184402

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title = "Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3",

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.",

author = "P. Manuel and Chapon, {L. C.} and Todorov, {I. S.} and Chung, {D. Y.} and Castellan, {J. P.} and S. Rosenkranz and R. Osborn and P. Toledano and Kanatzidis, {M. G.}",

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doi = "10.1103/PhysRevB.81.184402",

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T1 - Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3

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

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