Spin-driven bond order in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>5</mml:mn></mml:mfrac></mml:math>-magnetization plateau phase in the triangular lattice antiferromagnet CuFeO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>

Nakajima, Tsuyoshi; Terada, Noriki; Mitsuda, Setsuo; Bewley, Robert

doi:10.1103/physrevb.88.134414

Cited by 10 publications

(3 citation statements)

References 33 publications

(72 reference statements)

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“…caused by a slight difference in exchange interactions and the anisotropy constant [39][40][41][42]. Therefore, we anticipate that the magnetic ground state in CuFeO 2 can also be modified by hydrostatic pressure changing the exchange and anisotropy parameters.…”

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confidence: 94%

Pressure-induced polar phases in multiferroic delafossiteCuFeO2

et al. 2014

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Pressure-induced polar phases in multiferroic delafossiteCuFeO2

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“…For the edge-shared FeO 6 octahedra with the bonding angle close to 90° as in delafossite structure the strongest σ-σ bond is invalidated and the weakened antiferromagnetic contribution starts to compete with a ferromagnetic (J pot < 0) potential (Heisenberg) exchange giving rise to a striking sensitivity of the net exchange integral on rather small changes of structural parameters, such as superexchange bonding angles and cation-anion separations. Another characteristic feature of the topology of exchangeinteractions in delafossites AFeO 2 is that, different from the most part of ferrites, an O 2− ion belongs to three Fe-O-Fe bonds that makes the exchange coupling to be extremely sensitive to oxygen displacements and its electric polarization thus providing paths for understanding the exotic spin-lattice coupling phenomena, specifically spin-driven bond order, in geometrically frustrated magnets [15]. The comprehensive analysis of the isotropic superexchange coupling in delafossites has to take into account a strong electric polarization of the intermediate oxygen ions.…”

Section: Introductionmentioning

confidence: 99%

⁵⁷Fe Mössbauer study of unusual magnetic structure of multiferroic 3R-AgFeO₂

Sobolev¹,

Rusakov²,

Moskvin³

et al. 2017

J. Phys.: Condens. Matter

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We report new results of a 57 Fe Mössbauer study of multiferroic 3R-AgFeO 2 powder samples performed in a wide temperature range, including two points, T N1 » 14 K and T N2 » 9 K, of magnetic phase transitions. At the intermediate temperature range, T N2 < T < T N1 , the 57 Fe Mössbauer spectra can be described in terms of collinear spin-density-waves (SDW) with the inclusion of many high-order harmonics, indicating that the real magnetic structure of this ferrite appears to be more complicated than a pure sinusoidally modulated SDW. The spectra at low temperatures, T < T N2 , consist of a Zeeman pattern with line broadenings and sizeable spectral asymmetry. It has been shown that the observed spectral shape is consistent with a transition to the elliptical cycloidal magnetic structure. An analysis of the experimental spectra was carried out under the assumption that the electric hyperfine interactions are modulated when the Fe 3+ magnetic moment rotates with respect to the principal axis of the EFG tensor and emergence of the strong anisotropy of the magnetic hyperfine field H hf at the 57 Fe nuclei. The large and temperatureindependent anharmonicity parameter, m » 0.78, of the cycloidal spin structure obtained from the experimental spectra results from easy-axis anisotropy in the plane of rotation of the iron spin.Analysis of different mechanisms of spin and hyperfine interactions in 3R-AgFeO 2 and its structural analogue CuFeO 2 points to a specific role played by the topology of the exchange coupling and the oxygen polarization in the delafossite structures.

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“…A ferroelectric polarization along the hexagonal [1 1 0] axis is induced by magnetic field in the ferroelectric-incommensurate (FEIC) phase (7 T H 13 T) (see figure 3(c)) [18]. The mechanism regarding ferroelectric polarization has been extensively studied by bulk measurements [30][31][32], neutron scattering [19,[33][34][35][36][37][38][39][40][41][42][43], synchrotron x-ray diffraction [44][45][46][47] Terahertz spectroscopy [48], electron spin resonance [49][50][51], Mössbauer experiments [52] and some theoretical work [53][54][55][56][57][58][59][60][61][62][63], since the discovery of ferroelectric polarization in CuFeO 2 .…”

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confidence: 99%

Spin and orbital orderings behind multiferroicity in delafossite and related compounds

Terada¹

2014

J. Phys.: Condens. Matter

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Coupling between noncollinear magnetic ordering and ferroelectricicty in magnetoelectric multiferroics has been extensively studied in the last decade. Delafossite family compounds with triangular lattice structure provide a great opportunity to study the coupling between spin and electric dipole in multiferroics due to the variety of magnetic phases with different symmetry. This review introduces the magnetic and ferroelectric phase transitions in delafossite ferrites, CuFe(1-x)X(x)O(2) (X = Al, Ga), AgFeO(2) and the related compound α-NaFeO(2). In CuFeO(2), the ferroelectric phase appears under a magnetic field or chemical substitution. The proper screw magnetic ordering with the magnetic point group 21', which has been determined by detailed analysis in neutron diffraction experiments, induces the ferroelectric polarization along the monoclinic b axis in CuFeO2. The cycloidal magnetic orderings are realized in AgFeO(2) and α-NaFeO(2), which are of the point group m1' allowing polarization in the ac plane. The emergence of ferroelectric polarization can be explained by both the extended inverse Dzyaloshinsky-Moriya effect and the d − p hybridization mechanism. These mechanisms are supported by experimental evidence in CuFe(1-x)Ga(x)O2. The polarized neutron diffraction experiment demonstrated one-to-one correspondence between ferroelectric polarization and spin helicity, S(i) × S(j). The incommensurate orbital ordering with 2 Q wave vector, observed by the soft x-ray resonant diffraction experiment, proved that the spin-orbit interaction ties spin and orbital orders to each other, playing a crucial role for the emergence of ferroelectricity in CuFe(1-x)Ga(x)O2.

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Spin-driven bond order in a15-magnetization plateau phase in the triangular lattice antiferromagnet CuFeO2

Cited by 10 publications

References 33 publications

Pressure-induced polar phases in multiferroic delafossiteCuFeO2

Pressure-induced polar phases in multiferroic delafossiteCuFeO2

⁵⁷Fe Mössbauer study of unusual magnetic structure of multiferroic 3R-AgFeO₂

Spin and orbital orderings behind multiferroicity in delafossite and related compounds

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Spin-driven bond order in a15-magnetization plateau phase in the triangular lattice antiferromagnet CuFeO2

Cited by 10 publications

References 33 publications

Pressure-induced polar phases in multiferroic delafossiteCuFeO2

Pressure-induced polar phases in multiferroic delafossiteCuFeO2

57Fe Mössbauer study of unusual magnetic structure of multiferroic 3R-AgFeO2

Spin and orbital orderings behind multiferroicity in delafossite and related compounds

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⁵⁷Fe Mössbauer study of unusual magnetic structure of multiferroic 3R-AgFeO₂