Publisher’s Note: Zener Polaron Ordering in Half-Doped Manganites [Phys. Rev. Lett.<b>89</b>, 097205 (2002)]

Daoud‐Aladine, A.; Rodrı́guez-Carvajal, J.; Pinsard-Gaudart, L.; Fernández‐Díaz, M. T.; Revcolevschi, A.

doi:10.1103/physrevlett.89.129902

Cited by 127 publications

(236 citation statements)

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“…Such a bond-centered superstructure, or bond CDW, was proposed for the CO state in Pr 1-x Ca x MnO 3 at around x~0.4 [29] on the basis of a careful structural study of a good single crystal. This state, with an electron localized on a pair of Mn ions, or on a respective Mn-Mn bonds, was called Zener polaron in [29]. According to [29] these two-site polarons order in (PrCa)MnO 3 as shown in fig.3(b).…”

Section: Site-and Bond-centred Ordering and Ferroelectricity In Magnementioning

confidence: 99%

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Multiferroics: Different ways to combine magnetism and ferroelectricity

Khomskii

2006

Journal of Magnetism and Magnetic Materials

957

248

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Multiferroics -materials which are simultaneously (ferro)magnetic and ferroelectric, and often also ferroelastic, attract now considerable attention, both because of the interesting physics involved and as they promise important practical applications. In this paper I give a survey of microscopic factors determining the coexistence of these properties, and discuss different possible routes to combine them in one material. In particular the role of the occupation of d-states in transition metal perovskites is discussed, possible role of spiral magnetic structures is stressed and the novel mechanism of ferroelectricity in magnetic systems due to combination of site-centred and bond-centred charge ordering is presented. Microscopic nature of multiferroic behaviour in several particular materials, including magnetite Fe 3 O 4 , is discussed.

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Section: Site-and Bond-centred Ordering and Ferroelectricity In Magnementioning

confidence: 99%

“…This state, with an electron localized on a pair of Mn ions, or on a respective Mn-Mn bonds, was called Zener polaron in [29]. According to [29] these two-site polarons order in (PrCa)MnO 3 as shown in fig.3(b).…”

Section: Site-and Bond-centred Ordering and Ferroelectricity In Magnementioning

confidence: 99%

Multiferroics: Different ways to combine magnetism and ferroelectricity

Khomskii

2006

Journal of Magnetism and Magnetic Materials

957

248

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“…10 They propose different types of charge ordering in doped manganites: site-centered CO and bond-centered CO. A bond-centered CO model, named "Zener polaron", was suggested in Pr 0.6 Ca 0.4 MnO 3 for the first time from crystallographic results. 11 The symmetry of the crystal structure of this compound, which is non-centrosymmetric (P11m), and its magnetic properties seemed to indicate multiferroic behavior. Subsequent studies have experimentally evidenced that charge-ordered rare earth manganites such as Nd 0.5 Ca 0.5 MnO 3 , Pr 0.7 Ca 0.3 MnO 3 and Gd 0.5 Sr 0.5 MnO 3 12, 13 possess multiferroic and magnetoelectric properties.…”

Section: Introductionmentioning

confidence: 88%

“…Increased moments have been observed previously in manganates and have been attributed to the formation of Zener polarons. 11,28 Zener bipolarons occur when a Mn 3+ and Mn 4+ couple by sharing the one e g electron between them. This FM couples them and causes them to act as a single S = 7/2 species, which contributes a larger moment than two separate S = 2 and S = 3/2 species.…”

Section: Magnetic Phasesmentioning

confidence: 99%

“…It has been observed for half doped manganites that bipolaron formation of (Mn 3.5+ ) 2 units averages out the Mn-O bond lengths and leads to a narrower Mn-O bond length distribution than would be observed for a combination of Mn 3+ and Mn 4+ . 11 Based on the same principles, the (Mn 3.33+ ) 3 trimers in TbBaMn 2 O 5.75 would be expected to have a fairly narrow Mn-O bond length distribution. This leaves only 25% of the Mn in the +3 oxidation state, which is low enough that most of these Mn could become 5 coordinate if the oxygen vacancies preferentially locate around them.…”

Section: Magneticmentioning

confidence: 99%

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Magnetic properties and magnetic structures ofTbBaMn2O5.75: Possible observation of unconventional polaron trimers

2015

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The magnetism of the oxygen deficient, A-site layered perovskite TbBaMn 2 O 5.75 has been studied by magnetic susceptibility vs. temperature measurements and neutron powder diffraction. Four magnetic phases have been identified. Above 457 K a charge melted state exists where ferromagnetic double exchange interactions between the Mn ions dominate. Below 457 K charge ordering occurs and the exchange interactions become primarily antiferromagnetic. The magnetic moment in this phase is too large to be consistent with a charge ordering of Mn 3+ and Mn 4+ but could be explained by having 2 e g electrons being shared among 3 Mn centers, causing them to act as a single paramagnetic unit. This suggests that S = 11/2 (Mn 3.33+ ) 3 polaron trimers may be present along with Mn 3+ . Below 203 K long range ordering of the moments on the Mn ions occurs. Neutron powder diffraction data at 52 K reveal a magnetic structure containing an ↑↑↑↓ pattern of spins which is consistent with the formation of tripolarons. Below 11 K the Tb 3+ ions also undergo long range magnetic ordering.

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Photoinduced Colossal Magnetoresistance under Substantially Reduced Magnetic Field

Elovaara

Majumdar

Huhtinen

et al. 2015

Adv Funct Materials

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5030 wileyonlinelibrary.com phase transition from antiferromagnetic (AFM) to ferromagnetic (FM) phase. [ 10 ] The CMR effect is huge for PCMO compounds where the CO phase is established, but the IMT transition demands a very high magnetic [ 9,11 ] or electric [ 8 ] fi eld which is not suitable for technological applications. Recently we reported that metamagnetic transition can be achieved in a relatively low magnetic fi eld for structurally improved PCMO ( x = 0.4 and 0.5) thin fi lms compared to the bulk samples. [ 12 ] Photoinduced melting of CO phase was previously demonstrated by Miyano et al. [ 13 ] and Takubo et al. [ 14,15 ] where an IMT was obtained under a strong electric fi eld. Recent report of Beaud et al. showed an ultrafast photoinduced breaking of CO phase at 100 °C temperature in PCMO x = 0.5 thin fi lm. [ 16 ] We have earlier observed an increase in FM phase at the cost of AFM phase under illumination at the low temperature coexisting FM-AFM phase of low-hole doped PCMO ( x = 0.1) thin fi lms [ 17 ] which could be related to IMT transition in this strongly correlated system. In this paper, we report that by illumination CMR of almost nine orders of magnitude can be achieved in PCMO ( x = 0.4) thin fi lm under 50% less applied magnetic fi eld compared to that in dark. We term this combined effect of light and magnetic fi eld on the sample resistance as magnetophotoresistance (MPR). Also by changing the measuring bias voltage, the required magnetic fi eld can be fi ne-tuned. The result could have signifi cant impact on the new generation of phase-change memories working under affordable conditions. ResultsThe PCMO thin fi lm samples for this study were selected to have considerably strong CO phase with metamagnetic AFM to FM transition. The two fi lms were chosen based on their sizable difference in magnetic fi eld required for AFM to FM transition, for a better insight of the illumination effects on different strengths of CO phases (see the Supporting Information). The sample with the weaker CO phase is PCMO x = 0.4 with in situ annealing treatment at 500 °C, called p40-500. The stronger CO phase is on the PCMO x = 0.5 sample with in situ annealing treatment at 700 °C, called p50-700. More detailed information of the samples is given in the Experimental Section.The magnetoresistive measurements were executed with a standard two-point connection in Quantum Design physical property measurement system (PPMS) with fi beroptic Photoinduced Colossal Magnetoresistance under Substantially Reduced Magnetic FieldTomi Elovaara , * Sayani Majumdar , Hannu Huhtinen , and Petriina Paturi The colossal magnetoresistive insulator to metal switching of almost nine orders of magnitude under the signifi cantly reduced magnetic fi eld is achieved by illumination for the low bandwidth manganite thin fi lms. Similarly, by changing the measuring bias voltage through the sample the required magnetic fi eld for insulator-metal transition can be further fi netuned. By applying a magnetic fi eld of suitable strength, the...

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Publisher’s Note: Zener Polaron Ordering in Half-Doped Manganites [Phys. Rev. Lett.89, 097205 (2002)]

Cited by 127 publications

References 0 publications

Multiferroics: Different ways to combine magnetism and ferroelectricity

Multiferroics: Different ways to combine magnetism and ferroelectricity

Magnetic properties and magnetic structures ofTbBaMn2O5.75: Possible observation of unconventional polaron trimers

Photoinduced Colossal Magnetoresistance under Substantially Reduced Magnetic Field

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