Structural and magnetic properties of the single-layer manganese oxide<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><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:msub><mml:mi>MnO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Larochelle, S.; Mehta, Apurva; Li, Lu; Mang, P. K.; Vajk, O. P.; Kaneko, Nobu‐Hisa; Lynn, J. W.; Zhou, Long; Greven, M.

doi:10.1103/physrevb.71.024435

Cited by 96 publications

(140 citation statements)

References 79 publications

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“…Solid solution LaSrMnO 4 (LSMO) is found to be a Mott-Hubbard insulator, 31,32 crystallizing in the centrosymmetric I4/mmm space group with antiferromagnetic ordering 33 depicted in Fig. 1a.…”

Section: Model and Computational Methodsmentioning

confidence: 99%

Ferroelectricity from coupled cooperative Jahn-Teller distortions and octahedral rotations in ordered Ruddlesden-Popper manganates

Cammarata

Rondinelli

2015

Phys. Rev. B

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Density functional theory and group theoretical methods are used to explore the origin for ferroelectricity in cation ordered LaSrMnO4 with the Ruddlesden-Popper structure. The equilibrium phase exhibits the polar, P ca21 space group, where small polar displacements of d 4 Mn 3+ coexist with antiferrodistortive octahedral rotations and Jahn-Teller distortions. We find that the octahedral rotations and Jahn-Teller distortion stabilize the polar structure and induce polar displacements through high-order anharmonic interactions among the three modes, making LaSrMnO4 a hybridimproper ferroelectric material. The rotations result from the ionic size mismatch between the A cations and Mn whereas the Jahn-Teller distortions are energetically favored owing to the coupling between the local eg orbital polarization of the two nearest neighboring Mn cations in the two dimensional MnO2 sheets. Our results indicate that anharmonic interactions among multiple centric modes can be activated by cation ordering to induce polar displacements in layered oxides, making it a reliable approach for realizing acentric responses in artificially constructed materials.

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Section: Model and Computational Methodsmentioning

confidence: 99%

Ferroelectricity from coupled cooperative Jahn-Teller distortions and octahedral rotations in ordered Ruddlesden-Popper manganates

Cammarata

Rondinelli

2015

Phys. Rev. B

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“…The order manifests itself in X-ray diffraction measurements as a modulation of the Mn2-O bond lengths along the local xand y-directions. The negligible variation of the Mn2 valence 17 renders the orbital order fundamentally different from those in overdoped charge-orbital-ordered perovskite manganites: [13][14][15][16] Even though preceded by the Mn2-Mn3 charge order (at T s ), the orbital order is incommensurate with all pre-existing periodicity.…”

Section: Introductionmentioning

confidence: 99%

“…7 It is thus no surprise that most orbital order in the manganites exhibits some form of "lock-in" with the crystal lattice, [8][9][10][11][12] or with concomitant charge-ordering patterns. [13][14][15][16] In the latter case the Mn ions segregate themselves into 3+ and 4+ valence states, and because orbital order pertains only to the Mn 3+ sub-lattice, the ordering pattern develops on top of the charge order, usually in a commensurate fashion, even though the charge order itself may not be commensurate with the undistorted crystal lattice. [13][14][15][16] Recently, Perks et al 17 reported an unusual form of incommensurate orbital order in CaMn 7 O 12 .…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16] In the latter case the Mn ions segregate themselves into 3+ and 4+ valence states, and because orbital order pertains only to the Mn 3+ sub-lattice, the ordering pattern develops on top of the charge order, usually in a commensurate fashion, even though the charge order itself may not be commensurate with the undistorted crystal lattice. [13][14][15][16] Recently, Perks et al 17 reported an unusual form of incommensurate orbital order in CaMn 7 O 12 . Through a careful analysis of single-crystal X-ray diffraction data that builds on earlier reports of incommensurate lattice distortions below ∼ 250 K, 18,19 the authors identified a continuous rotation of Mn 3+ e g orbital occupation between the local 3x 2 −r 2 and 3y 2 −r 2 states (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Soft vibrational mode associated with incommensurate orbital order in multiferroicCaMn7O12

Yuan

Duan

et al. 2014

Phys. Rev. B

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We report inelastic light scattering measurements of lattice dynamics related to the incommensurate orbital order in CaMn7O12. Below the ordering temperature To ≈ 250 K, we observe extra phonon peaks as a result of Brillouin-zone folding, as well as a soft vibrational mode with a powerlaw T -dependent energy, Ω = Ω0(1 − T /To) 1/2 . This temperature dependence demonstrates the second-order nature of the transition at To, and it indicates that the soft mode can be regarded as the amplitude excitation of the composite order parameter. Our result strongly suggests that the lattice degrees of freedom are actively involved in the orbital-ordering mechanism.

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“…They have been observed in a variety of systems, including nickelates, 1,2,3,4,5,6,7,8 cuprates, 9,10,11,12,13,14,15 and manganites. 16,17,18 Among them, layered La 2−x Sr x CuO 4 (LSCO), La 2−x−y Nd y Sr x CuO 4 (Nd-LSCO), La 2−x Sr x NiO 4 (LSNO), and La 2 NiO 4+δ (LNO) compounds play plausibly the most prominent role. However the similarity between them is superficial only, and the stripes in the cuprates differ from the stripes in the nickelates in many respects.…”

mentioning

confidence: 99%

Microscopic origin of diagonal stripe phases in doped nickelates

2006

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We investigate the electron density distribution and the stability of stripe phases in the realistic two-band model with hopping elements between eg orbitals at Ni sites on the square lattice, and compare these results with those obtained for the doubly degenerate Hubbard model with two equivalent orbitals and diagonal hopping. For both models we determine the stability regions of filled and half-filled stripe phases for increasing hole doping x = 2 − n in the range of x < 0.4, using Hartree-Fock approximation for large clusters. In the parameter range relevant to the nickelates, we obtain the most stable diagonal stripe structures with filling of nearly one hole per atom, as observed experimentally. In contrast, for the doubly degenerate Hubbard model the most stable stripes are somewhat reminiscent of the cuprates, with half-filled atoms at the domain wall sites. This difference elucidates the crucial role of the off-diagonal eg hopping terms for the stripe formation in La2−xSrxNiO4. The influence of crystal field is discussed as well. I. STRIPE PHASES IN NICKELATESStripe phases are one of the most exciting phenomena of modern condensed matter physics. They have been observed in a variety of systems, including nickelates, 1,2,3,4,5,6,7,8 cuprates, 9,10,11,12,13,14,15 and manganites. 16,17,18 Among them, layered La 2−x Sr x CuO 4 (LSCO), La 2−x−y Nd y Sr x CuO 4 (Nd-LSCO), La 2−x Sr x NiO 4 (LSNO), and La 2 NiO 4+δ (LNO) compounds play plausibly the most prominent role. However the similarity between them is superficial only, and the stripes in the cuprates differ from the stripes in the nickelates in many respects. For instance, they are dynamical in the former, and static in the latter. In addition, in Nd-LSCO 9,10,11,12,13,14 and LSCO, 15 one finds the so-called half-filled stripes, with the density of one doped hole per two atoms along the domain wall (DW). In contrast, it is clear from a variety of experiments that magnetic states within doped NiO 2 planes of the nickelates are filled stripes with density of one doped hole per one atom in a DW. 1,2,3,4,5,6,7,8 The question of filling is not the only difference between the nickelate and cuprate stripes, however. Neutron diffraction measurements performed on Nd-LSCO revealed that magnetic peaks are displaced from the antiferromagnetic (AF) maximum at Q AF = π(1, 1) to the points Q s = π(1 ± 2ǫ, 1) and Q s = π(1, 1 ± 2ǫ) and the shift ǫ depends linearly on hole doping x for x < 1/8, while it is almost constant at higher doping. These values correspond to a superposition of vertical (01) and horizontal (10) DWs. The essentially identical modulation and doping dependence of ǫ was observed in superconducting crystals of LSCO with x > 0.05. Conversely, experiments on LSNO established that spin order is characterized by the wave vectors Q s = π(1 ± ǫ, 1 ± ǫ) with ǫ ≃ x for x < 1/3, corresponding to a constant charge of one hole/Ni ion along a diagonal DW, in agreement with the predictions made in the pioneering works by Zaanen and Gunnarsson 19 and others, 20,21,...

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Structural and magnetic properties of the single-layer manganese oxideLa1−xSr1+xMnO4

Cited by 96 publications

References 79 publications

Ferroelectricity from coupled cooperative Jahn-Teller distortions and octahedral rotations in ordered Ruddlesden-Popper manganates

Ferroelectricity from coupled cooperative Jahn-Teller distortions and octahedral rotations in ordered Ruddlesden-Popper manganates

Soft vibrational mode associated with incommensurate orbital order in multiferroicCaMn7O12

Microscopic origin of diagonal stripe phases in doped nickelates

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