Optical imaging of multiphase coexistence in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Nd</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mm

Kolb, P. W.; Romero, D. B.; Drew, H. D.; Moritomo, Yutaka; Souchkov, A. B.; Ogale, S. B.

doi:10.1103/physrevb.70.224415

Cited by 14 publications

(14 citation statements)

References 9 publications

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“…Also, the seeding position of charge order depends on sample [32]. Thus we speculate that the seeding is unavoidable crystalline imperfections, as also indicated from other competing correlated system [37]. Similar nucleation has also been proposed in a ferroelectric relaxor: a polar domain is created near the nano-sized chemically ordering regions [38].…”

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confidence: 60%

Optical Conductivity Measurement of a Dimer Mott-Insulator to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound

et al. 2013

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We report a novel insulator-insulator transition arising from the internal charge degrees of freedom in the two-dimensional quarter-filled organic salt β-(meso-DMBEDT-TTF)2PF6. The optical conductivity spectra above Tc=70 K display a prominent feature of the dimer Mott insulator, characterized by a substantial growth of a dimer peak near 0.6 eV with decreasing temperature. The dimer peak growth is rapidly quenched as soon as a peak of the charge order appears below Tc, indicating a competition between the two insulating phases. Our infrared imaging spectroscopy has further revealed a spatially competitive electronic phase far below Tc, suggesting a nature of quantum phase transition driven by material-parameter variations.

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confidence: 60%

Optical Conductivity Measurement of a Dimer Mott-Insulator to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound

et al. 2013

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“…3,11 The phase coexistence has been probed through variety of techniques, such as Lorentz transmission electron microscopy ͑TEM͒, 1 electron spectroscopy for chemical analysis ͑ESCA͒ microscopy, 2 x-ray diffraction ͑XRD͒, 3 and polarized optical microscopy. 13 Looking into theoretical expectations 11,14 and experimental observations, 3 the structural, electrical, and magnetic properties may have appreciable difference in pellet and powder versions of the manganite sample. Such studies are important from the point of view that most of the basic physical property studies on manganites are being carried out on well sintered polycrystalline pellet samples but its results are very frequently being correlated with the phase characterization results, obtained using powder sample.…”

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confidence: 99%

Strain-induced first-order orbital flip transition and coexistence of charge-orbital ordered phases inPr0.5Ca0.5MnO3

et al. 2008

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Low-temperature transmission electron microscopy and x-ray diffraction ͑XRD͒ studies have been carried out on pellet and powder samples of Pr 0.5 Ca 0.5 MnO 3 . These studies have revealed appearance of a different type of charge-orbital ordered ͑COO͒ phase, resulting due to flipping of e g orbitals from d 3x 2 −r 2 / d 3y 2 −r 2 to d 3x 2 −r 2 / d 3z 2 −r 2 configuration. This orbital flip results in a changeover of the COO superlattice-ordering vector from ͑1/2,0,0͒ to ͑1/4,1/2,1/4͒ in the Pnma phase. This COO phase coexists with the conventional COO phase. Low-temperature XRD studies show that the COO phase appears only in pellet sample and not in the corresponding powder sample. The powder sample shows only conventional COO phase. Volume fractions of conventional and the other type COO phases in pellet sample of Pr 0.5 Ca 0.5 MnO 3 is estimated to be ϳ55% and 45%, respectively. The occurrence of orbital flip has been attributed to local strain building up in the pellet sample. The strain builds up during cooling because manganite has anisotropic thermal expansion coefficients.

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“…This behavior of La4Ni3O8 contrasts with that of the single-layer nickelates, as well as that of many other transition metal oxides, for which the charge stripes order at a higher temperature than the spin stripes with the spin order having a temperature dependence consistent with its secondary nature [7]. Specific examples of other transition metal oxides that do exhibit simultaneous charge and spin stripe transitions include the 3-dimensional perovskite Nd1/3Sr2/3FeO3 [35], but which clearly has a dominant charge order parameter instead, as well as Nd1/2Sr1/2MnO3 [36]. Thus, the simultaneous transitions in quasi-2D materials and non-dominant order parameters appear unique to La4Ni3O8.…”

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Spin Stripe Order in a Square Planar Trilayer Nickelate

et al. 2019

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Trilayer nickelates, which exhibit a high degree of orbital polarization combined with an electron count (d 8.67 ) corresponding to overdoped cuprates, have been identified as a promising candidate platform for achieving high-Tc superconductivity. One such material, La4Ni3O8, undergoes a semiconductor-insulator transition at ~105 K, which was recently shown to arise from the formation of charge stripes. However, an outstanding issue has been the origin of an anomaly in the magnetic susceptibility at the transition and whether it signifies formation of spin stripes akin to single layer nickelates. Here we report single crystal neutron diffraction measurements (both polarized and unpolarized) that establish that the ground state is indeed magnetic. The ordering is modeled as antiferromagnetic spin stripes that are commensurate with the charge stripes, the magnetic ordering occurring in individual trilayers that are essentially uncorrelated along the crystallographic c-axis. Comparison of the charge and spin stripe order parameters reveals that, in contrast to single-layer nickelates such as La2-xSrxNiO4 as well as related quasi-2D oxides including manganites, cobaltates, and cuprates, these orders uniquely appear simultaneously, thus demonstrating a stronger coupling between spin and charge than in these related low-dimensional correlated oxides. Main text:There has been intense interest in stripe phases due to the interplay of charge, spin and lattice degrees of freedom as well as their relevance to high-temperature superconductivity in cuprates [1][2][3][4][5][6][7][8][9]. Uncovering cuprate-like superconductivity in oxides containing transition metals other than copper remains a daunting challenge [10], and in this regard R4Ni3O8 (R=La, Pr, or Nd) compounds have emerged as potential candidates [11][12][13]. These layered materials possess structures that resemble the n=3 Ruddlesden-Popper phase (Rn+1NinO3n+1) [14], but they differ in that all apical oxygens are absent, resulting in trilayers of NiO2 planes in which all Ni ions possess square-planar coordination of oxygen anions. The electron count (3d 8.67 ) coincides with the over-doped regime of cuprates [12,15]. Recent work indicates that these nickelates possess a low-spin state of Ni, large orbital polarization of the eg states with predominantly 2 − 2 orbital character near the Fermi energy, and significant O 2p-Ni 3d hybridization, all of which are considered to be important ingredients for superconductivity in the high-Tc cuprates [12]. Thus R4Ni3O8 compounds (particularly Pr4Ni3O8 which is metallic in its ground state [12]) are more similar to the superconducting cuprates than previously studied nickelates with octahedral coordination, such as La2-xSrxNiO4 (LSNO) [16][17][18] and LaNiO3-based heterostructures [19].Unlike metallic Pr4Ni3O8, La4Ni3O8 undergoes a semiconductor-insulator transition upon cooling through ∼105 K [11,13,[20][21][22][23][24][25][26][27][28], and we have recently shown that the insulating state is characterized by the formation ...

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Optical imaging of multiphase coexistence inNd1∕2Sr1∕2MnO3

Cited by 14 publications

References 9 publications

Optical Conductivity Measurement of a Dimer Mott-Insulator to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound

Optical Conductivity Measurement of a Dimer Mott-Insulator to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound

Strain-induced first-order orbital flip transition and coexistence of charge-orbital ordered phases inPr0.5Ca0.5MnO3

Spin Stripe Order in a Square Planar Trilayer Nickelate

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