Experimental realization of a unique class of compounds: XY-antiferromagnetic triangular lattices, KAg2Fe[VO4]2 and RbAg2Fe[VO4]2, with ferroelectric ground states

Ngozi E. Amuneke; Joshua Tapp; Clarina R. De La Cruz; Angela Möller

doi:10.1021/cm5025712

Experimental realization of a unique class of compounds: XY-antiferromagnetic triangular lattices, KAg₂Fe[VO₄]₂ and RbAg₂Fe[VO₄]₂, with ferroelectric ground states

Ngozi E. Amuneke, Joshua Tapp, Clarina R. De La Cruz, Angela Möller

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Abstract

AAg₂Fe[VO₄]₂ with A = K or Rb was synthesized by solid state methods and characterized by thermodynamic properties measurements (Néel order at T_N ≈ 3.0 K). The respective nuclear (a^K,Rb = 5.48 Å, c^K = 7.212 Å, c^Rb = 7.357 Å, P3¯, Z = 1) and magnetic structures were refined using neutron diffraction in applied magnetic fields. The results indicate enhanced structural stability of the P3¯ structure and the realization of a frustrated triangular lattice with antiferromagnetic XY-anisotropies. Two magnetic structures were identified: a helical and chiral Y-phase with a propagation vector of (1/3, 1/3, ≈ 0.39) and a commensurate up-up-down phase. These unique compounds offer convenient experimental access for optimizing the features and properties of ferroaxial multiferroic materials.

Original language	English
Pages (from-to)	5930-5935
Number of pages	6
Journal	Chemistry of Materials
Volume	26
Issue number	20
DOIs	https://doi.org/10.1021/cm5025712
State	Published - Oct 28 2014

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title = "Experimental realization of a unique class of compounds: XY-antiferromagnetic triangular lattices, KAg2Fe[VO4]2 and RbAg2Fe[VO4]2, with ferroelectric ground states",

abstract = "AAg2Fe[VO4]2 with A = K or Rb was synthesized by solid state methods and characterized by thermodynamic properties measurements (N{\'e}el order at TN ≈ 3.0 K). The respective nuclear (aK,Rb = 5.48 {\AA}, cK = 7.212 {\AA}, cRb = 7.357 {\AA}, P3¯, Z = 1) and magnetic structures were refined using neutron diffraction in applied magnetic fields. The results indicate enhanced structural stability of the P3¯ structure and the realization of a frustrated triangular lattice with antiferromagnetic XY-anisotropies. Two magnetic structures were identified: a helical and chiral Y-phase with a propagation vector of (1/3, 1/3, ≈ 0.39) and a commensurate up-up-down phase. These unique compounds offer convenient experimental access for optimizing the features and properties of ferroaxial multiferroic materials.",

author = "Amuneke, {Ngozi E.} and Joshua Tapp and {De La Cruz}, {Clarina R.} and Angela M{\"o}ller",

note = "Publisher Copyright: {\textcopyright} 2014 American Chemical Society.",

year = "2014",

month = oct,

day = "28",

doi = "10.1021/cm5025712",

language = "English",

volume = "26",

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journal = "Chemistry of Materials",

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T1 - Experimental realization of a unique class of compounds

T2 - XY-antiferromagnetic triangular lattices, KAg2Fe[VO4]2 and RbAg2Fe[VO4]2, with ferroelectric ground states

AU - Amuneke, Ngozi E.

AU - Tapp, Joshua

AU - De La Cruz, Clarina R.

AU - Möller, Angela

PY - 2014/10/28

Y1 - 2014/10/28

N2 - AAg2Fe[VO4]2 with A = K or Rb was synthesized by solid state methods and characterized by thermodynamic properties measurements (Néel order at TN ≈ 3.0 K). The respective nuclear (aK,Rb = 5.48 Å, cK = 7.212 Å, cRb = 7.357 Å, P3¯, Z = 1) and magnetic structures were refined using neutron diffraction in applied magnetic fields. The results indicate enhanced structural stability of the P3¯ structure and the realization of a frustrated triangular lattice with antiferromagnetic XY-anisotropies. Two magnetic structures were identified: a helical and chiral Y-phase with a propagation vector of (1/3, 1/3, ≈ 0.39) and a commensurate up-up-down phase. These unique compounds offer convenient experimental access for optimizing the features and properties of ferroaxial multiferroic materials.

AB - AAg2Fe[VO4]2 with A = K or Rb was synthesized by solid state methods and characterized by thermodynamic properties measurements (Néel order at TN ≈ 3.0 K). The respective nuclear (aK,Rb = 5.48 Å, cK = 7.212 Å, cRb = 7.357 Å, P3¯, Z = 1) and magnetic structures were refined using neutron diffraction in applied magnetic fields. The results indicate enhanced structural stability of the P3¯ structure and the realization of a frustrated triangular lattice with antiferromagnetic XY-anisotropies. Two magnetic structures were identified: a helical and chiral Y-phase with a propagation vector of (1/3, 1/3, ≈ 0.39) and a commensurate up-up-down phase. These unique compounds offer convenient experimental access for optimizing the features and properties of ferroaxial multiferroic materials.

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Experimental realization of a unique class of compounds: XY-antiferromagnetic triangular lattices, KAg₂Fe[VO₄]₂ and RbAg₂Fe[VO₄]₂, with ferroelectric ground states

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