Crystal and magnetic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi>Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>: Role of the orbital degree of freedom

Senff, D.; Reutler, P.; Braden, M.; Friedt, O.; Bruns, Donald G.; Cousson, A.; Bourée, F.; Merz, Michael; Büchner, B.; Revcolevschi, A.

doi:10.1103/physrevb.71.024425

Cited by 52 publications

(88 citation statements)

References 40 publications

(26 reference statements)

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“…Note that in all cases except E z = 0, we find the experimentally observed 8 increase of in-plane |x electron density with increasing doping which shows that E z > 0 in the low doping regime.…”

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confidence: 54%

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Doping dependence of spin and orbital correlations in layered manganites

et al. 2006

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We investigate the interplay between spin and orbital correlations in monolayer and bilayer manganites using an effective spin-orbital t-J model which treats explicitly the eg orbital degrees of freedom coupled to classical t2g spins. Using finite clusters with periodic boundary conditions, the orbital many-body problem is solved by exact diagonalization, either by optimizing spin configuration at zero temperature, or by using classical Monte-Carlo for the spin subsystem at finite temperature. In undoped two-dimensional clusters, a complementary behavior of orbital and spin correlations is found -the ferromagnetic spin order coexists with alternating orbital order, while the antiferromagnetic spin order, triggered by t2g spin superexchange, coexists with ferro-orbital order. With finite crystal field term, we introduce a realistic model for La1−xSr1+xMnO4, describing a gradual change from predominantly out-of-plane 3z 2 − r 2 to in-plane x 2 − y 2 orbital occupation under increasing doping. The present electronic model is sufficient to explain the stability of the CE phase in monolayer manganites at doping x = 0.5, and also yields the C-type antiferromagnetic phase found in Nd1−xSr1+xMnO4 at high doping. Also in bilayer manganites magnetic phases and the accompanying orbital order change with increasing doping. Here the model predicts C-AF and G-AF phases at high doping x > 0.75, as found experimentally in La2−2xSr1+2xMn2O7.

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supporting

confidence: 54%

“…By considering the structural data, a uniform crystal field splitting of e g orbitals is expected both for a monolayer, 8 and for a bilayer system. 13 Therefore, we introduce the term,…”

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confidence: 99%

Doping dependence of spin and orbital correlations in layered manganites

et al. 2006

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“…The elongates by about one order of magnitude less [12,27]. The local geometry is tetragonally distorted for x=0 and develops towards an octahedral coordination for x=0.5 [7].…”

Section: A Single Crystalsmentioning

confidence: 94%

Hard x-ray probe to study doping-dependent electron redistribution and strong covalency inLa1−xSr1+xMnO
Herrero‐Martín
¹
,
Mirone
²
,
Fernández-Rodríguez
³

et al. 2010
Phys. Rev. B
27
4
21
1
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The effect of doping on the electronic structure at the Mn sites in the La 1-x Sr 1+x MnO 4 series (x=0, 0.3 and 0.5) was studied by means of non-resonant hard X-ray emission spectroscopy (XES). We observe a linear dichroism in the Mn Kβ main lines (3p to 1s transitions) that is strongest for x=0 and decreases with increasing x to 0.5. The Mn Kβ main lines in the polycrystalline samples change considerably less upon increasing the hole doping (substitution of La by Sr) than it would be expected based on the change of formal valence. From this we conclude that the charge and spin density at the Mn sites are only little affected by doping.This implies that holes injected in the La 1-x Sr 1+x MnO 4 series mainly result in a decrease of charge density on the oxygen atoms, i.e. oxygen takes part in the charge balancing. These findings are supported by many-body cluster calculations.

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“…The undoped monolayer LaSrMnO 4 compound has the same magnetic structure as K 2 NiF 4 , with a 2D G-type AF (G-AF) order with AF moments in both directions [24]. At x = 0.5 the AF order is CE-type (FM zig-zag chains with AF order in between), as deduced from the X-ray and neutron scattering data for the structural and magnetic correlations [25], as well as from the neutron measurements of magnetic excitations [26].…”

Section: Spin T−j Modelmentioning

confidence: 99%

Orbital Correlations in Monolayer Manganites - From Spin t-J Model to Orbital t-J Model

Daghofer

Oleś

2007

Acta Phys. Pol. A

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On the example of monolayer manganites we show that the theoretical ideas developed long ago along the derivation of the spin t−J model from the Hubbard model are nowadays very helpful in strongly correlated oxides with partly filled degenerate orbitals. We analyze a realistic orbital t−J model for eg electrons in La1−xSr1+xMnO4 monolayer manganites, and discuss the evolution of spin and orbital correlations under increasing doping by performing exact diagonalization of finite clusters, with electronic kinetic energy determined self-consistently at a finite temperature by classical Monte Carlo for t2g spins. Several experimental results are reproduced. Spin t−J modelA new perspective to treat strongly correlated electrons was opened by the derivation of the spin t−J model three decades ago [1]. We argue that this derivation opened new routes to understand the complex magnetic and superconducting instabilities in the Hubbard model, and proved to be a very useful paradigm in strongly correlated electron systems. At that time it was already realized that the Hubbard model,where a † iσ is an electron creation operator in spin state σ =↑, ↓ at site i and U is local Coulomb interaction, is perfectly designed to describe electron localization (497)

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Crystal and magnetic structure ofLa1−xSr1+xMnO4: Role of the orbital degree of freedom

Cited by 52 publications

References 40 publications

Doping dependence of spin and orbital correlations in layered manganites

Doping dependence of spin and orbital correlations in layered manganites

Hard x-ray probe to study doping-dependent electron redistribution and strong covalency inLa1−xSr1+xMnO
Herrero‐Martín
¹
,
Mirone
²
,
Fernández-Rodríguez
³

et al. 2010
Phys. Rev. B
27
4
21
1
View full text Add to dashboard Cite

Orbital Correlations in Monolayer Manganites - From Spin t-J Model to Orbital t-J Model

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Crystal and magnetic structure ofLa1−xSr1+xMnO4: Role of the orbital degree of freedom

Cited by 52 publications

References 40 publications

Doping dependence of spin and orbital correlations in layered manganites

Doping dependence of spin and orbital correlations in layered manganites

Hard x-ray probe to study doping-dependent electron redistribution and strong covalency inLa1−xSr1+xMnOHerrero‐Martín1, Mirone2, Fernández-Rodríguez3 et al. 2010Phys. Rev. B274211View full textAdd to dashboardCite

Orbital Correlations in Monolayer Manganites - From Spin t-J Model to Orbital t-J Model

Contact Info

Product

Resources

About

Hard x-ray probe to study doping-dependent electron redistribution and strong covalency inLa1−xSr1+xMnO
Herrero‐Martín
¹
,
Mirone
²
,
Fernández-Rodríguez
³

et al. 2010
Phys. Rev. B
27
4
21
1
View full text Add to dashboard Cite