Lattice dynamics and microscopic mechanisms of the spontaneous magnetodielectric effect in the antiferromagnetic fluoroperovskites<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>KCoF</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>RbCoF</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Dubrovin, R. M.; Siverin, N. V.; Сырников, П. П.; Новикова, Н. Н.; Болдырев, К. Н.; Pisarev, R. V.

doi:10.1103/physrevb.100.024429

Cited by 14 publications

(12 citation statements)

References 71 publications

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“…This softening is similar to that observed in the isostructural KCoF 3 and RbCoF 3 crystals previously reported in Ref. [56]. For our further analysis, it is convenient to convert phonon frequency ω to the force constant k, which are related as ω = k/µ, where µ is the reduced mass of ions in the unit cell.…”

Section: B Softening Of the Polar Modesupporting

confidence: 84%

“…The temperature dependences of this quantity for the considered cubic fluoroperovskites together with the data for KCoF 3 and RbCoF 3 from Ref. [56] are shown in Fig. 4(a).…”

Section: B Softening Of the Polar Modementioning

confidence: 99%

“…To analyze the behavior of the harmonic force constant k 0 let us consider the squared frequency ω 2 1TO (5 K) at the low temperature also in the two groups of the cubic fluoroperovskites KMnF 3 [52; 53], KCoF 3 [56], KNiF 3 and RbMnF 3 , RbFeF 3 [59], RbCoF 3 [56] in which also only the 3d ion changes. The k 0 values for KMnF 3 and RbFeF 3 are somewhat overestimated because the phonon frequencies ω 1TO are given in the literature only for room temperature but this does not violate the general trend.…”

Section: B Softening Of the Polar Modementioning

confidence: 99%

“…The data for KCoF 3 and RbCoF 3 have been adapted from Ref. [56]. (c) Dependence of the squared phonon frequency ω 2 1TO (5 K) at low temperature which represent the reduced harmonic force constant k0(T )/µ on the tolerance factor t in two groups of the cubic fluoroperovskites: KMnF 3 [52; 53] (at room temperature), KCoF 3 [56], KNiF 3 and RbMnF 3 , RbFeF 3 [59] (at room temperature), RbCoF 3 [56] with insignificant difference of the reduced mass µ.…”

Section: B Softening Of the Polar Modementioning

confidence: 99%

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Incipient geometric lattice instability of cubic fluoroperovskites

Dubrovin,

Garcia-Castro,

Siverin

et al. 2021

Preprint

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Inorganic metal halide perovskites are promising materials for next-generation technologies due to plethora of unique physical properties, many of which cannot be observed in the oxide perovskites. On the other hand, the search for ferroelectricity and multiferroicity in lead-free inorganic halide perovskites remains a challenging research topic. Here, we experimentally show that cubic fluoroperovskites exhibit proximity to incipient ferroelectrics, which manifested in the softening of the low-frequency polar phonons in the Brillouin zone center at cooling. Furthermore, we reveal the coupling between harmonic and anharmonic force constants of the softening phonons and their correlation with the perovskite tolerance factor. Next, using first-principles calculations, we examine the lattice dynamics of the cubic fluoroperovskites and disclose the incipient lattice instability at which the harmonic force constants of low-lying phonons tend to decrease with a reduction of tolerance factor at all high-symmetry points of the Brillouin zone. The correlations with the tolerance factor indicate the geometric origin of observed incipient lattice instability in the cubic fluoroperovskites caused by the steric effect due to the volume filling of the unit cell by different radius ions. These results provide insights into the lattice dynamics and potential ferroelectric properties of inorganic lead-free metal halide perovskites, relevant to further design and synthesis of new multifunctional materials.

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Section: B Softening Of the Polar Modesupporting

confidence: 84%

“…The temperature dependences of this quantity for the considered cubic fluoroperovskites together with the data for KCoF 3 and RbCoF 3 from Ref. [56] are shown in Fig. 4(a).…”

Section: B Softening Of the Polar Modementioning

confidence: 99%

Section: B Softening Of the Polar Modementioning

confidence: 99%

Section: B Softening Of the Polar Modementioning

confidence: 99%

See 2 more Smart Citations

Incipient geometric lattice instability of cubic fluoroperovskites

Dubrovin,

Garcia-Castro,

Siverin

et al. 2021

Preprint

Self Cite

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“…More recently identified first-order effects are the splitting of phonon modes in paramagnets in an external magnetic field [70,71], the phonon Hall [72][73][74] and phonon Einstein-de Haas [23] effects in paramagnetic dielectrics, as well as the phonon Zeeman effect in nonmagnetic dielectrics [30,31]. A manifestation of the second-order effect in the phenomenology can be found in the ionic contribution to the known magnetodielectric effect [75,76], in which the ionic part of the dielectric function, and therefore the dynamical matrix, is modulated by the magnetic order. Because of the analogy to the magneto-optical effects, these effects have been discussed as the Faraday and Cotton-Mouton effects of phonons in early studies [77,78].…”

Section: Hamiltonianmentioning

confidence: 99%

Phono-magnetic analogs to opto-magnetic effects

Juraschek

Narang

Spaldin

2020

Phys. Rev. Research

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The magneto-optical and opto-magnetic effects describe the interaction of light with a magnetic medium. The most prominent examples are the Faraday and Cotton-Mouton effects that modify the transmission of light through a medium, and the inverse Faraday and inverse Cotton-Mouton effects that produce effective magnetic fields for the spin in the material. Here, we introduce the phenomenology of the analogous magneto-phononic and phono-magnetic effects, in which vibrational quanta take the place of the light quanta. We show, using a combination of first-principles calculations and phenomenological modeling, that the effective magnetic fields exerted by the phonon analogs of the inverse Faraday and inverse Cotton-Mouton effects on the spins of antiferromagnetic nickel oxide yield magnitudes comparable to and potentially larger than those of the opto-magnetic originals.

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