Ferromagnetism and electron-phonon coupling in the manganites

Edwards, D. M.

doi:10.1080/00018730210140805

Cited by 155 publications

(185 citation statements)

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“…The second class emphasizes the effect due to the quantum fluctuations of different e g -orbitals [64,65,28]. The third one goes beyond the electronic origin by taking into account magnon-phonon coupling [46,47,66] and other lattice-related effects such as A-site disorder in the spin excitations [35].…”

Section: Discussion Of Possible Explanationsmentioning

confidence: 99%

Magnons in ferromagnetic metallic manganites

Zhang¹,

Ye²,

Sha³

et al. 2007

J. Phys.: Condens. Matter

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Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground for the classical double-exchange interaction mechanism for the 'colossal' magnetoresistance, but also because they exhibit an extraordinary arena of emergent phenomena. These emergent phenomena are related to the complexity associated with strong interplay between charge, spin, orbital, and lattice. In this review, we focus on the use of inelastic neutron scattering to study the spin dynamics, mainly the magnon excitations in this class of FM metallic materials. In particular, we discuss the unusual magnon softening and damping near the Brillouin zone boundary in relatively narrow-band compounds with strong Jahn-Teller lattice distortion and charge-orbital correlations. The anomalous behaviours of magnons in these compounds indicate the likelihood of cooperative excitations involving spin and lattice as well as orbital degrees of freedom.

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Section: Discussion Of Possible Explanationsmentioning

confidence: 99%

Magnons in ferromagnetic metallic manganites

Zhang¹,

Ye²,

Sha³

et al. 2007

J. Phys.: Condens. Matter

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“…Within the framework of this APH model, which has been described by Edwards [23] in detail, the following relation is derived for σ :…”

Section: Adiabatic Polaron Hoppingmentioning

confidence: 99%

“…For the temperature dependence of the hopping probability (hopping frequency) p(T ) several variable-range hopping (VRH) [19,20,21] models, adiabatic polaron hopping (APH) [18,22,23] models, or combinations of both [24,25] were reported in the literature. Briefly, the concepts behind APH and VRH are explained in the following:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…with E h being the hopping energy, connected to the polaron binding energy E p via E h = E p /2 for oxides in general [27] and via E h = E p /4 for manganites [23].…”

Section: Adiabatic Polaron Hoppingmentioning

confidence: 99%

“…Additionally, they took the influence of a temperature dependent rigid polaronic pseudo gap in the densitiy of states [23,32], ∆ pg , into account and deduced the following temperature dependence of the conductivity:…”

Section: Variable-range Hoppingmentioning

confidence: 99%

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Quantifying the electrical transport characteristics of electron-doped La0.7Ce0.3MnO3 thin films through hopping energies, Mn valence, and carrier localization length

Thiessen

Beyreuther

Werner³

et al. 2015

Journal of Physics and Chemistry of Solids

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Abstract. Presently, cerium-doped LaMnO 3 is vividly discussed as an electron-doped counterpart prototype to the wellestablished hole-doped mixed-valence manganites. Here, La 0.7 Ce 0.3 MnO 3 thin films of different thicknesses, degrees of CeO 2 phase segregation, and oxygen deficiency, grown on SrTiO 3 single crystal substrates, are compared with respect to their resistancevs.-temperature (R vs. T) behavior from 300 K down to 90 K. While the variation of the film thickness (and thus the degree of epitaxial strain) in the range between 10 nm and 100 nm has only a weak impact on the electrical transport, the degree of oxygen deficiency as well as the existence of CeO 2 clusters can completely change the type of hopping mechanism. This is shown by fitting the respective R-T curves with three different transport models (adiabatic polaron hopping, Mott variable-range hopping, Efros-Shklovskii variable-range hopping), which are commonly used for the mixed-valence manganites. Several characteristic transport parameters, such as the hopping energies, the carrier localization lengths, as well as the Mn valences are derived from the fitting procedures.

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(In_1−yMn_y)MnO₃ (1/9≤y≤1/3): Unusual Perovskites with Unusual Properties

et al. 2010

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The perovskite-type ABO 3 structure is highly adaptive. There are hundreds of perovskite-type compounds. [1] Many of them have extremely important technological properties, for example BaTiO 3 , SrTiO 3 , SrRuO 3 , and Pb(Zr 1Àx Ti x )O 3 . Applications of perovskites range from use as catalysts or sensors to superconductors and ferromagnetic or ferroelectric materials. [1] Among perovskites, (doped) manganites LnMnO 3 (Ln = La-Lu) have been investigated a lot in the last decades because of the colossal magnetoresistance and orbital/charge ordering phenomena. [2,3] The discovery of multiferroic properties of LnMnO 3 (Ln = Tb-Lu) has attracted new interest to these systems. [4,5] LnMnO 3 (Ln = La-Lu) compounds are divided into two groups: perovskites LnMnO 3 (Ln = La-Dy) and hexagonal LnMnO 3 (Ln = Y, Ho-Lu). The perovskite modification can be stabilized for all members of LnMnO 3 (Ln = La-Lu) using a high-pressure synthesis or other methods. The magnetic phase diagram for perovskites LnMnO 3 (Ln = La-Lu) is well established, and there are two magnetic phases with longrange ordering and multiferroic properties for small Ln 3+ ions. [3][4][5] With decreasing radius of Ln 3+ ions, the Jahn-Teller distortion increases and the competition between nearestneighbor and next-nearest-neighbor interactions is enhanced. [3] Are there any possibilities to extend the existing phase diagram of LnMnO 3 ? The hexagonal modification is known for smaller ions, such as in ScMnO 3 , and InMnO 3 . [6,7] However, ScMnO 3 and InMnO 3 perovskites have never been reported, even though attempts to stabilize new phases of ScMnO 3 and InMnO 3 have been made. [8] Note that ScCrO 3 , [9] Angewandte Chemie 7889

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Ferromagnetism and electron-phonon coupling in the manganites

Cited by 155 publications

References 151 publications

Magnons in ferromagnetic metallic manganites

Magnons in ferromagnetic metallic manganites

Quantifying the electrical transport characteristics of electron-doped La0.7Ce0.3MnO3 thin films through hopping energies, Mn valence, and carrier localization length

(In_1−yMn_y)MnO₃ (1/9≤y≤1/3): Unusual Perovskites with Unusual Properties

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Ferromagnetism and electron-phonon coupling in the manganites

Cited by 155 publications

References 151 publications

Magnons in ferromagnetic metallic manganites

Magnons in ferromagnetic metallic manganites

Quantifying the electrical transport characteristics of electron-doped La0.7Ce0.3MnO3 thin films through hopping energies, Mn valence, and carrier localization length

(In1−yMny)MnO3 (1/9≤y≤1/3): Unusual Perovskites with Unusual Properties

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(In_1−yMn_y)MnO₃ (1/9≤y≤1/3): Unusual Perovskites with Unusual Properties