Room temperature polar structure and multiferroicity in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>BaFe</mml:mi><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub><mml:mi>Se</mml:mi><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>

Zheng, W. G.; Balédent, V.; Lepetit, Marie-Bernadette; Retailleau, P.; Elslande, E.; Pasquier, Claude; Auban‐Senzier, Pascale; Forget, A.; Colson, D.; Foury-Leylekian, P.

doi:10.1103/physrevb.101.020101

Cited by 12 publications

(30 citation statements)

References 22 publications

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“…A recent work reported the space group Pmn2 1 (a subgroup of Pnma) at room temperature, allowing the tetramerization and polarization 27 . Another recent X-ray diffraction work reported the space group Pmn2 1 at 300 K but Pm (a subgroup of Pmn2 1 allowing the inequivalent ladders) at 150 K 28 . In fact, the patterns of NPD (or X-ray) are very subtle among these space groups (see Supplementary Fig.…”

Section: Manipulation Of Bafe 2 Se 3 By An External Electric Fieldmentioning

confidence: 99%

Direct visualization of irreducible ferrielectricity in crystals

Guo

Jin

et al. 2020

npj Quantum Mater.

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In solids, charge polarity can one-to-one correspond to spin polarity phenomenologically, e.g., ferroelectricity/ferromagnetism, antiferroelectricity/antiferromagnetism, and even dipole-vortex/magnetic-vortex, but ferrielectricity/ferrimagnetism kept telling a disparate story in microscopic level. Since the definition of a charge dipole involves more than one ion, there may be multiple choices for a dipole unit, which makes most ferrielectric orders equivalent to ferroelectric ones, i.e., this ferrielectricity is not necessary to be a real independent branch of polarity. In this work, by using the spherical aberration-corrected scanning transmission electron microscope, we visualize a nontrivial ferrielectric structural evolution in BaFe 2 Se 3 , in which the development of two polar sub-lattices is out-of-sync, for which we term it as irreducible ferrielectricity. Such irreducible ferrielectricity leads to a non-monotonic behavior for the temperature-dependent polarization, and even a compensation point in the ordered state. Our finding unambiguously distinguishes ferrielectrics from ferroelectrics in solids.

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Section: Manipulation Of Bafe 2 Se 3 By An External Electric Fieldmentioning

confidence: 99%

Direct visualization of irreducible ferrielectricity in crystals

Guo

Jin

et al. 2020

npj Quantum Mater.

View full text Add to dashboard Cite

show abstract

“…Weak intensity was later observed on the hk0, h = 2n + 1 peaks of the X-ray diffraction pattern, that are forbidden in the P nma group [14]. Instead of P mna, the polar space group P mn2 1 was proposed for BaFe 2 Se 3 's room temperature structure [14]. Below T N , a further symmetry lowering was observed and assigned to a transition from P mn2 1 to P m [14].…”

Section: Introductionmentioning

confidence: 99%

“…A few years later, Dong et al [13] theoretically predicted that the observed block-type magnetic order should induce a polar symmetry lowering, due to exchange-striction effects. Weak intensity was later observed on the hk0, h = 2n + 1 peaks of the X-ray diffraction pattern, that are forbidden in the P nma group [14]. Instead of P mna, the polar space group P mn2 1 was proposed for BaFe 2 Se 3 's room temperature structure [14].…”

Section: Introductionmentioning

confidence: 99%

“…Instead of P mna, the polar space group P mn2 1 was proposed for BaFe 2 Se 3 's room temperature structure [14]. Below T N , a further symmetry lowering was observed and assigned to a transition from P mn2 1 to P m [14].…”

Section: Introductionmentioning

confidence: 99%

“…Another important difference between the P nma, and P mn2 1 or P m structures, is the Fe-Fe bond alternation along the ladder direction. Whereas the P nma space group symmetry imposes that a long bond faces a short one in the ladders, thus building alternated trapezoidal blocks along the ladder direction, in the lower symmetry groups, this constraint is lifted and the P mn2 1 /P m structures [14] posses long (short) bonds that are at the same level along the ladder direction (see Fig. 5).…”

Section: Introductionmentioning

confidence: 99%

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Space Group Symmetry of BaFe$_2$Se$_3$: ab initio-Experiment Phonon Study

Weseloh¹,

Balédent²,

Zheng³

et al. 2022

Preprint

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This paper presents a study of the structure dynamics in BaFe2Se3. We combined first-principle calculations, infrared measurements and a thorough symmetry analysis. Our study confirms that P nma cannot be the space group of BaFe2Se3, even at room temperature. The phonons assignment requires P m to be the BaFe2Se3 space group, not only in the magnetic phase, but also in the paramagnetic phase at room temperature. This is due to a strong coupling between a short range spin-order along the ladders, and the lattice degrees of freedom associated with the Fe-Fe bond length. This coupling induces a change in the bond-length pattern from an alternated trapezoidal one (as in P nma) to an alternated small/large rectangular one. Out of the two patterns, only the latter is fully compatible with the observed block-type magnetic structure. Finally, we propose a complete symmetry analysis of the BaFe2Se3 phase diagram in the 0-600 K range.

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Universal stripe order as a precursor of the superconducting phase in pressurized BaFe2Se3 Spin Ladder

et al. 2022

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It has been recently observed that a superconducting phase emerges under pressure in the Fe-based spin-ladders BaFe2X3 (X = S, Se). The low dimensionality of the Fe spin-ladders, which simplifies the elaboration of theoretical models, should help to understand the mechanism of superconductivity. We investigate here the frontier between magnetic and superconducting (SC) phases in BaFe2Se3 by performing challenging powder neutron diffraction (PND) and Fe Kβ x-ray emission spectroscopy (XES) under high pressure. We show that the ambient pressure ground state with a block-like magnetic order is destabilized under pressure. A pressure-induced antiferromagnetic stripe-like spin order, similar to the magnetic order of the parent superconductor BaFe2S3, is observed above 3-4 GPa. Our discovery shows that the stripe magnetic order is a key phase close to the SC dome and its particular magnetic fluctuations could be involved in the stabilization of superconductivity in Fe-based spin ladders.

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Room temperature polar structure and multiferroicity in BaFe2Se3

Cited by 12 publications

References 22 publications

Direct visualization of irreducible ferrielectricity in crystals

Direct visualization of irreducible ferrielectricity in crystals

Space Group Symmetry of BaFe$_2$Se$_3$: ab initio-Experiment Phonon Study

Universal stripe order as a precursor of the superconducting phase in pressurized BaFe2Se3 Spin Ladder

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