One-dimensional short-range magnetic correlations in the magnetoelectric pyroxene<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CaMnGe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Ding, Lei; Colin, Claire; Darie, Céline; Robert, J.; Gay, Frédéric; Bordet, Pierre

doi:10.1103/physrevb.93.064423

Cited by 23 publications

(20 citation statements)

References 34 publications

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“…Transition-metal pyroxenes show variable magnetic dimensionality and different types of the long-range order. The dimensionality changes between quasi-1D and 3D depending on the tetrahedral group [39], whereas several flavors of commensurate and collinear long-range order were reported in previous studies [17,33,40]. Some of the pyroxenes show signatures of the frustration, such as the enhanced ratio Θ/T N between the Curie-Weiss and Néel temperatures, but this reduction in T N is typically related to the magnetic one-dimensionality [39].…”

Section: Discussionmentioning

confidence: 82%

“…The k = 0 phase is common to transition-metal pyroxenes and has been reported, e.g., for NaCrGe 2 O 6 , NaCrSi 2 O 6 [33,40] and CaMnGe 2 O 6 [17]. It corresponds to the ferromagnetic ordering of antiferromagnetic spin chains.…”

Section: Mean-field Analysismentioning

confidence: 83%

“…As one of the main components of the Earth's crust and upper mantle, pyroxenes with the chemical formula AMT 2 O 6 (A = mono-or divalent metal, M = transition metal, T = Ge or Si) have gained renewed attention of condensed- * lei.ding.ld@outlook.com; lei.ding@sftc.ac.uk † altsirlin@gmail.com matter physicists, since recently a number of magnetic pyroxenes were found to show multiferroicity or magnetoelectric effect [12][13][14][15][16][17]. Subsequent investigation showed that only NaFeGe 2 O 6 [14], SrMnGe 2 O 6 [16], and the mineral aegirine [12] are truly multiferroic.…”

Section: Introductionmentioning

confidence: 99%

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Unraveling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6 : A combined experimental and theoretical study

et al. 2018

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Magnetic order and the underlying magnetic model of the multiferroic pyroxene NaFeGe 2 O 6 are systematically investigated by neutron powder diffraction, thermodynamic measurements, density-functional bandstructure calculations, and Monte-Carlo simulations. Upon cooling, NaFeGe 2 O 6 first reveals one-dimensional spin-spin correlations in the paramagnetic state below about 50 K, uncovered by magnetic diffuse scattering. The sinusoidal spin-density wave with spins along the a-direction sets in at 13 K, followed by the cycloidal configuration with spins lying in the (ac) plane below 11.6 K. Microscopically, the strongest magnetic coupling runs along the structural chains, J 1 ≃ 12 K, which is likely related to the one-dimensional spin-spin correlations. The interchain couplings J 2 ≃ 3.8 K and J 3 ≃ 2.1 K are energetically well balanced and compete, thus giving rise to the incommensurate order in sharp contrast to other transition-metal pyroxenes, where one type of the interchain couplings prevails. The magnetic model of NaFeGe 2 O 6 is further completed by the weak single-ion anisotropy along the a-direction. Our results resolve the earlier controversies regarding the magnetic order in NaFeGe 2 O 6 and establish relevant symmetries of the magnetic structures. These results, combined with symmetry analysis, enable us to identify the possible mechanisms of the magnetoelectric coupling in this compound. We also elucidate microscopic conditions for the formation of incommensurate magnetic order in pyroxenes.

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Section: Discussionmentioning

confidence: 82%

Section: Mean-field Analysismentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Unraveling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6 : A combined experimental and theoretical study

et al. 2018

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“…Dielectric permittivity measurements on the same material show two anomalies at 94 and 80 K, due to magnetic transition and trigonal P − 3c1 to monoclinic C2/c structural phase transition, respectively 10,11,20,21 .…”

Section: Introductionmentioning

confidence: 94%

Pressure driven re-entrant magnetoelectric transition in honeycomb $Fe_{4}Nb_{2}O_{9}$

Sahu,

Ghosh,

Jana

et al. 2021

Preprint

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A detailed high pressure investigation is carried out on F e 4 Nb 2 O 9 using angle resolved x-ray diffraction and Raman spectroscopy measurements. We find a structural transition from the ambient trigonal phase to a monoclinic phase above 8.8 GPa. The structural transition is assumed to be driven by a large distortion of Nb − O 6 octahedra as seen from x-ray diffraction analysis and a large pressure dependence of Nb − O 6 octahedra breathing Raman mode. Anomalous behaviour of Raman modes and increase in the phonon life time at the phase transition pressure indicate a trigonal paramagnetic phase to a monoclinic antiferromagnetic state above 8.8 GPa. Decrease in the diffusive scattering rate of low frequency electronic contribution contradicts the results of decrease in intensity of high frequency electronic response and excludes the phenomenon of insulator to metal transition. Instead the enhancement of the intensity of the Raman modes till about 8.8 GPa indicate a large change in ferroelectric polarization of the sample indicating pressure induced re-entrant magentoelectric effect in F e 4 Nb 2 O 9 .

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“…Compounds of the pyroxene family, which can incorporate all the 3d transition metal elements, have recently attracted considerable interest thanks to their original and diverse magnetic properties, including multiferroism (Jodlauk et al, 2007;Kim et al, 2012;Ding et al, 2016a), linear magnetoelectric effect (Né nert et al, 2010;Ding et al, 2016b) or quasione-dimensional magnetic behaviour (Valentí et al, 2002). Such physical properties stem essentially from their unique quasi-one-dimensional crystal structure and the competition between inter-and intra-chain magnetic interactions.…”

Section: Introductionmentioning

confidence: 99%

Three different Ge environments in a new Sr₅CuGe₉O₂₄phase synthesized at high pressure and high temperature

Klein¹,

Kodjikian²,

Philippe³

et al. 2020

Acta Crystallogr Sect B

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In the framework of expanding the range of copper-based compounds in the pyroxene family, we have synthesized at high pressure and high temperature a powder containing a mixture of a new phase with stoichiometry Sr5CuGe9O24 having two identified impurity phases. Electron crystallography showed that the new phase crystallizes in the monoclinic space group P2/c, with unit-cell parameters a = 11.8 Å, b = 8.1 Å, c = 10.3 Å and β = 101.3°. We applied the recently developed low-dose electron diffraction tomography method to solve the structure by direct methods. The obtained structure model contains all 9 independent cation positions and all 13 oxygen positions. A subsequent refinement against powder X-ray diffraction data ascertained the high quality of the structure solution, in particular, the unusual structural arrangement that there are three different environments for Ge in this phase.

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One-dimensional short-range magnetic correlations in the magnetoelectric pyroxeneCaMnGe2O6

Cited by 23 publications

References 34 publications

Unraveling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6 : A combined experimental and theoretical study

Unraveling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6 : A combined experimental and theoretical study

Pressure driven re-entrant magnetoelectric transition in honeycomb $Fe_{4}Nb_{2}O_{9}$

Three different Ge environments in a new Sr₅CuGe₉O₂₄phase synthesized at high pressure and high temperature

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One-dimensional short-range magnetic correlations in the magnetoelectric pyroxeneCaMnGe2O6

Cited by 23 publications

References 34 publications

Unraveling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6 : A combined experimental and theoretical study

Unraveling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6 : A combined experimental and theoretical study

Pressure driven re-entrant magnetoelectric transition in honeycomb $Fe_{4}Nb_{2}O_{9}$

Three different Ge environments in a new Sr5CuGe9O24phase synthesized at high pressure and high temperature

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Three different Ge environments in a new Sr₅CuGe₉O₂₄phase synthesized at high pressure and high temperature