Neutron diffraction study and magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LaMn</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ga</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</m

Blasco, J.; Garcı́a, J.; Campo, Javier; Sánchez, M. C.; Subı́as, G.

doi:10.1103/physrevb.66.174431

Cited by 79 publications

(107 citation statements)

References 18 publications

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“…Ga 3+ is homovalent with both Fe 3+ in LaFeO3 and Mn 3+ in LaMnO3, and the LaGaO3 perovskite is a typical insulator because of the 3d 10 electronic configuration of Ga 3+ . Fe substitution by Ga in LaFeO3 reduces the antiferromagnetic interaction, lowering TN to ≈ 215 K for x = 0.5 [16], whereas it induces a change to a canted ferrimagnet for x < 0.5 and to a ferromagnet for x ≥ 0.5 in LaMnO3 [17]. In both series the main structural change produced by Ga dilution is to progressively eliminate the long-range ordered transition metal in the LaFeO3 and LaMnO3 lattices giving way to isolated Fe 3+ and Mn 3+ ions respectively.…”

Section: Introductionmentioning

confidence: 99%

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO₃and LaMnO₃studied by Ga substitution of the transition metal ion

Lafuerza

Subı́as

García

et al. 2011

J. Phys.: Condens. Matter

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We report on experimental oxygen K-edge x-ray absorption near-edge structure (XANES) spectra of the LaFe 1-x Ga x O 3 and LaMn 1-x Ga x O 3 series. The transition-metal substitution by the 3d full shell Ga atom is mainly reflected in a systematic decrease of the pre-edge structures in the XANES spectra of the two series. This result shows that the associated states originate from the hybridization of oxygen 2p and unoccupied Fe (or Mn) 3d states. We have analyzed the experimental results in terms of detailed calculations based on multiple-scattering theory. In order to relate the pre-edge features to the corresponding atomic arrangements and electronic characters, we performed simulations with variable cluster size and composition around the absorber oxygen in the LaFeO 3 and LaMnO 3 crystal structures. We find that the low-energy prepeak is correctly reproduced if just the absorbing oxygen and the two nearest neighbours Fe (or Mn) ions are considered in the cluster. Conversely, higher energy pre-peaks only arise when the full oxygen-coordination geometry around the two metal sites is taken into account. The coupled electronic and structural origin of the pre-peaks successfully explains the difference observed in the pre-edge structures between the XANES spectra of LaFeO 3 and LaMnO 3 .

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Section: Introductionmentioning

confidence: 99%

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO₃and LaMnO₃studied by Ga substitution of the transition metal ion

Lafuerza

Subı́as

García

et al. 2011

J. Phys.: Condens. Matter

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“…LaMn 1−x Ga x O 3 (x = 0.6) and LaMn 1−x Cr x O 3 (0.35<x<0.6) [6,10]. Using dynamic magnetization measurements it was shown that LaMn 0.5 Ga 0.5 O 3 is not a homogeneous ferromagnet as it was suggested earlier [7].…”

Section: Introductionmentioning

confidence: 77%

“…Orbital ordering leads to anisotropic superexchange interactions and Atype antiferromagnetic order below 140 K [3]. The longrange ferromagnetic component has been observed in the LaMn 1−x Ga x O 3 (0.2 < x < 0.6) and LaMn 1−x Cr x O 3 (0.4 < x < 0.6) series containing only Mn 3+ species [5][6][7][8][9][10][11]. These series show gradual transition into the orbitally disordered state upon substitution with Ga 3+ (x > 0.…”

Section: Introductionmentioning

confidence: 93%

“…This model suggests real electron transfer from Mn 3+ (Co 3+ ) to Mn 4+ (Co 4+ ) while this mechanism is effective only for the mixedvalence systems. However, it was found that the ferromagnetic state can be stabilized in some compounds where manganese or cobalt ions are in 3+ or 4+ oxidation state only [3][4][5][6][7][8][9][10][11]. Orbitally disordered state in parent LaMnO 3 above 750 K results in dominant ferromagnetic interactions, as confirmed by the positive Weiss constant (θ ≈ 160 K [3,4]).…”

Section: Introductionmentioning

confidence: 96%

“…According to the neutron powder diffraction (NPD) data [6] the orbitally ordered LaMn 0.5 Ga 0.5 O 3 is a homogeneous collinear ferromagnet [6]. It was proposed that the ferromagnetism in the orbitally ordered state of the homovalent manganite can be caused by orbital fluctuations [3,5,9].…”

Section: Introductionmentioning

confidence: 99%

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Crystal Structure and Chemical Characterization of La_0.7Sr_0.3Mn_0.7Ti_0.3-xAl_xO₃ (0 ≤ x ≤ 0.15) Compounds

Troyanchuk¹,

Bushinsky²,

Терешко³

et al. 2017

Acta Phys. Pol. A

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Neutron powder diffraction and magnetization measurements have been performed for La0.7Sr0.3Mn0.7Ti0.3−xAlxO3 (0 ≤ x ≤ 0.15) stoichiometric compounds. Increase of the Al 3+ content enlarges the Mn 4+ ions fraction from 0% (x = 0) up to around 20% (x = 0.15). The x = 0 composition around 150 K exhibits a structural transition from the rhombohedral phase to the orthorhombic one whereas the crystal structure of the compounds with x = 0.1 and 0.15 remains to be rhombohedral down to 2 K. The substitution of Ti 4+ by Al 3+ ions is accompanied by a gradual increase in the bond angle Mn-O-Mn and decrease in the Mn-O bond length which lead to enhancement of the covalent component of the chemical bond. All these compounds exhibit ferromagnetic components below 100 K. Magnetic moments estimated per manganese from the neutron powder diffraction data are found to be around 1.3 µB (x = 0) and 1.7 µB (x = 0.1 and 0.15) at 2 K. It is suggested that ferromagnetism is originated predominantly from the Mn 3+ -O-Mn 3+ and Mn 3+ -O-Mn 4+ superexchange interactions whereas bond angles fluctuation leads to magnetic frustrations. Enhancement of covalence slightly increases ferromagnetism.

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Intrinsic Triple Order in A‐site Columnar‐Ordered Quadruple Perovskites: Proof of Concept

et al. 2018

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There is an emerging topic in the science of perovskite materials: A-site columnar-ordered A A'A''B O quadruple perovskites, which have an intrinsic triple order at the A sites. However, in many examples reported so far, A' and A'' cations are the same, and the intrinsic triple order is hidden. Here, we investigate structural properties of Dy CuMnMn O (1) and Ho MnGaMn O (2) by neutron and X-ray powder diffraction and prove the triple order at the A sites. The cation distributions determined are [Ho ] [Mn] [Ga Mn ] [Mn Ga ] O and [Dy ] [Cu Mn ] [Mn Dy ] [Mn Cu ] [Mn ] O . There are clear signatures of Jahn-Teller distortions in 1 and 2, and the orbital pattern is combined with an original type of charge ordering in 1. Columnar-ordered quadruple perovskites represent a new playground to study complex interactions between different electronic degrees of freedom. No long-range magnetic order was found in 2 by neutron diffraction, and its magnetic properties in low fields are dominated by an impurity with negative magnetization or magnetization reversal. On the other hand, 1 shows three magnetic transitions at 21, 125, and 160 K.

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Neutron diffraction study and magnetic properties ofLaMn1−xGaxO

Cited by 79 publications

References 18 publications

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO₃and LaMnO₃studied by Ga substitution of the transition metal ion

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO₃and LaMnO₃studied by Ga substitution of the transition metal ion

Crystal Structure and Chemical Characterization of La_0.7Sr_0.3Mn_0.7Ti_0.3-xAl_xO₃ (0 ≤ x ≤ 0.15) Compounds

Intrinsic Triple Order in A‐site Columnar‐Ordered Quadruple Perovskites: Proof of Concept

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Neutron diffraction study and magnetic properties ofLaMn1−xGaxO

Cited by 79 publications

References 18 publications

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO3and LaMnO3studied by Ga substitution of the transition metal ion

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO3and LaMnO3studied by Ga substitution of the transition metal ion

Crystal Structure and Chemical Characterization of La0.7Sr0.3Mn0.7Ti0.3-xAlxO3 (0 ≤ x ≤ 0.15) Compounds

Intrinsic Triple Order in A‐site Columnar‐Ordered Quadruple Perovskites: Proof of Concept

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Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO₃and LaMnO₃studied by Ga substitution of the transition metal ion

Origin of the pre-peak features in the oxygen K-edge x-ray absorption spectra of LaFeO₃and LaMnO₃studied by Ga substitution of the transition metal ion

Crystal Structure and Chemical Characterization of La_0.7Sr_0.3Mn_0.7Ti_0.3-xAl_xO₃ (0 ≤ x ≤ 0.15) Compounds