Metal-insulator phase transitions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SmNiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PrNiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml

Mroginski, María Andrea; Massa, N. E.; Salva, H.R.; Martı́nez-Lope, M. J.

doi:10.1103/physrevb.60.5304

Cited by 37 publications

(36 citation statements)

References 16 publications

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“…Other studies have already described phonon behavior in rareearth nickelates [25,26]. At low temperature, the spectra present insulator type reflectivity with well-defined phonon bands.…”

Section: Infrared Measurementmentioning

confidence: 94%

Moderate pressure synthesis of rare earth nickelate with metal–insulator transition using polymeric precursors

Napierala

Lepoittevin

Edely³

et al. 2010

Journal of Solid State Chemistry

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“…Other studies have already described phonon behavior in rareearth nickelates [25,26]. At low temperature, the spectra present insulator type reflectivity with well-defined phonon bands.…”

Section: Infrared Measurementmentioning

confidence: 94%

Moderate pressure synthesis of rare earth nickelate with metal–insulator transition using polymeric precursors

Napierala

Lepoittevin

Edely³

et al. 2010

Journal of Solid State Chemistry

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“…The giant shift of the T IM arising from the isotropic substitution of 16 O 18 O and the infl uence of oxygen displacements on the density of states point to the presence of strong electronphonon coupling in R NiO 3 [ 13,17,18 ] conducive to polaronic type distortions. [ 19,21 ] LaNiO 3 resides near the T = 0 K transition on the metallic side of the phase diagram and its structure is nominally rhombohedral with undistorted NiO 3 octahedra. This is wileyonlinelibrary.com constraints of the monoclinic P 2 1 / n unit cell that is shown in Figure 2 a.…”

Section: Doi: 101002/aelm201500261mentioning

confidence: 99%

“…[ 19,21 ] LaNiO 3 resides near the T = 0 K transition on the metallic side of the phase diagram and its structure is nominally rhombohedral with undistorted NiO 3 octahedra. This is [+] Present Address:…”

mentioning

confidence: 99%

“…[ 15 ] On the metallic side, LaNiO 3 is thought to undergo no magnetic or structural transitions below 1050 K. [ 3 ] The paramagnetic susceptibility shows only an infl ection around 200 K, attributed to an enhancement of the magnetic fl uctuations [ 16 ] although its origin is not well understood.The giant shift of the T IM arising from the isotropic substitution of 16 O 18 O and the infl uence of oxygen displacements on the density of states point to the presence of strong electronphonon coupling in R NiO 3 [ 13,17,18 ] conducive to polaronic type distortions. [ 19,21 ] LaNiO 3 resides near the T = 0 K transition on the metallic side of the phase diagram and its structure is nominally rhombohedral with undistorted NiO 3 octahedra. This is [+] Present Address:…”

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confidence: 99%

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Insulating Pockets in Metallic LaNiO₃

Louca

Yano

et al. 2015

Adv Elect Materials

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in contrast to the distorted perovskite structure of the monoclinic phase on the insulating side of the phase boundary. Our neutron scattering results on a LaNiO 3 powder sample show that on the nanoscale, the crystal structure of the ground state is not rhombohedral. Locally, the symmetry is broken at the Ni sites due to oxygen distortions that in turn create three unique oxygen sites. The local structure is best described by the monoclinically distorted lattice with the P 2 1 / n symmetry. This fi nding is consistent with recent observations of a monoclinic phase in thin fi lms but in the current case in the absence of strain. [ 22,23 ] In the bulk, two Ni sublattices are formed due to the oxygen distortions. LaNiO 3 is a promising electronic material used as a substrate in ferroelectric electrodes and spintronic devices, [24][25][26][27] with properties that sensitively depend on the dimensionality of the electron system and can be tuned by interfacial engineering of superlattices. [ 28,29 ] The current results suggest that the appearance of the monoclinic phase at the surface has its roots in the bulk, where the lattice is predisposed to the distortion, only to be accentuated at the surface under conditions of strain.On the insulating site of the R NiO 3 phase diagram, a two sublattice structure has been previously established. Evidence is provided here that suggests, on the metallic site, the crystal lattice of LaNiO 3 harbors a two sublattice structure as well. This observation is made by examining the local structure via the pair density function (PDF), ρ ( r ), method. Shown in Figure 1 a-c is the ρ ( r ) exp representing the local atomic confi guration at varying lengths as a function of temperature. Note that the correlation peaks correspond to the probability of fi nding a particular pair of atoms at a given distance in space. For instance, the fi rst peak around 1.93 Å in Figure 1 a corresponds to the shortest distance in the structure that is between Ni and O atoms in the octahedron. It can be seen that upon warming, the Ni O peak height decreases while its width expands asymmetrically. The origin of the asymmetry is discussed below.At the lowest temperature of 2 K, the data (symbols) are compared to two model PDFs calculated within the constraints of the crystal symmetries noted on each plot (Figure 1 b). The input parameters (atomic coordinates and unit cell dimensions) used to calculate each model are provided in the Supporting Information. At 2 K, the data are fi rst compared to the ρ ( r ) mod (solid line) corresponding to the average crystal symmetry of 3 R c. The comparison is reasonably good, however small differences are observed between the two that cannot be reproduced in the 3 R c. The goodness of fi t for this comparison is determined to be 0.28. [ 30 ] In the 3 R c, there exists only one unique oxygen site. A better fi t to the data is provided by introducing oxygen distortions in the model. In the new local ρ ( r ) mod shown in the middle plot of Figure 1 b, the oxygen site is split to...

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“…2,3 However, recent results on superlattices demonstrate that LaNiO 3 exhibits signatures of a weakly coupled spin density wave (SDW). 4 The nickelates can be tuned from Fermi liquids to strongly renormalized bad metals to antiferromagnetic insulators through epitaxial strain and/or chemical substitution, 3,[5][6][7] and are therefore an important experimental platform for evaluating theories that bridge the limits of strong and weak electron correlation.…”

Section: Introductionmentioning

confidence: 99%

Hall effect measurements on epitaxial SmNiO3thin films and implications for antiferromagnetism

Jaramillo

Silevitch

et al. 2013

Phys. Rev. B

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The rare-earth nickelates (RNiO 3 ) exhibit interesting phenomena such as unusual antiferromagnetic order at wavevector q = (½, 0, ½) and a tunable insulator-metal transition that are subjects of active research. Here we present temperature-dependent transport measurements of the resistivity, magnetoresistance, Seebeck coefficient, and Hall coefficient (R H ) of epitaxial SmNiO 3 thin films with varying oxygen stoichiometry. We find that from room temperature through the high temperature insulator-metal transition, the Hall coefficient is hole-like and the Seebeck coefficient is electron-like. At low temperature the Néel transition induces a crossover in the sign of R H to electron-like, similar to the effects of spin density wave formation in metallic systems but here arising in an insulating phase ~200 K below the insulator-metal transition. We propose that antiferromagnetism can be stabilized by bandstructure even in insulating phases of correlated oxides, such as RNiO 3 , that fall between the limits of strong and weak electron correlation.3

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Metal-insulator phase transitions ofSmNiO3andPrNiO3:

Cited by 37 publications

References 16 publications

Moderate pressure synthesis of rare earth nickelate with metal–insulator transition using polymeric precursors

Moderate pressure synthesis of rare earth nickelate with metal–insulator transition using polymeric precursors

Insulating Pockets in Metallic LaNiO₃

Hall effect measurements on epitaxial SmNiO3thin films and implications for antiferromagnetism

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Metal-insulator phase transitions ofSmNiO3andPrNiO3:

Cited by 37 publications

References 16 publications

Moderate pressure synthesis of rare earth nickelate with metal–insulator transition using polymeric precursors

Moderate pressure synthesis of rare earth nickelate with metal–insulator transition using polymeric precursors

Insulating Pockets in Metallic LaNiO3

Hall effect measurements on epitaxial SmNiO3thin films and implications for antiferromagnetism

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Product

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About

Insulating Pockets in Metallic LaNiO₃