A Localized-Electron to Collective-Electron Transition in the System (La, Sr)CoO3

Raccah, P. M.; Goodenough, John B

doi:10.1063/1.1656227

Cited by 279 publications

(118 citation statements)

References 5 publications

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“…LSCO shows a rich magnetic phase diagram, ranging from a spin glass with × < 0.18 to strong ferromagnetic behavior at × > 0.3. [ 14 ] In addition, CoO 6 octahedra are more likely to rotate and maintain the octahedral tilt pattern that is imposed at the interface because the octahedra do not show strong Jahn Teller distortions like La 1-x Sr x MnO 3 (LSMO). [ 15 ] This rigidity of the octahedra is necessary for the effects of the long range properties to be examined with bulk techniques and differs greatly from that found in other similar perovskites such as LSMO or BiFeO 3 where the tilts have been found to return to bulk tilt patterns within a few unit cells of the interface, presumably requiring the distortion of octahedra.…”

Section: Doi: 101002/admi201400203mentioning

confidence: 99%

Interrelation between Structure – Magnetic Properties in La_0.5Sr_0.5CoO₃

Biegalski

Takamura

Mehta

et al. 2014

Adv Materials Inter

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scale and tailored to have desired properties. Modern synthesis techniques, for instance, can exploit this deeper understanding of structure -property relationships and fabricate epitaxial superlattices composed of alternating layers, each with their own functional property and the complete stack operating as a highly complex and self-contained device. [ 4,5 ] The ideal perovskite structure has cubic symmetry characterized by BO 6 octahedra with equal B-O bond angles/distances in all directions. However, differences in the ionic radii of the A and B atoms lead to tilts and rotations of the octahedra and lowering of structural symmetry. Glazer [ 6 ] devised a notation to describe these tilts along the three principle crystallographic directions and tabulated the families of half-order peaks associated with various lowered structural symmetries. In epitaxial fi lms, the lattice mismatch between the fi lm and the substrate results in differing in-plane vs. out-of-plane bond angles/distances; and/or to a change in the pattern of BO 6 tilts/rotations. These structural distortions occur commonly in perovskites and while several theoretical studies have highlighted their impact on the functional properties, [7][8][9][10]

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Section: Doi: 101002/admi201400203mentioning

confidence: 99%

Interrelation between Structure – Magnetic Properties in La_0.5Sr_0.5CoO₃

Biegalski

Takamura

Mehta

et al. 2014

Adv Materials Inter

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“…Percolation of metallic regions is believed to lead to the colossal magnetoresistance observed in LaMnO 3 , [6][7][8] and leads to interesting magnetic and electronic properties in Sr substituted La 1−x Sr x CoO 3 . [9][10][11][12] While the change in carrier concentration can be estimated based on the amount of doping, there are other considerations that can affect the onset of an insulator-to-metal transition. The size of the dopant ion relative to the crystallographic site, as well as complimentary changes in valence to maintain neutrality can impart local distortions that can also affect an insulator-to-metal transition.…”

Section: Introductionmentioning

confidence: 99%

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Lamontagne¹,

Laurita²,

Knight³

et al. 2017

Inorg. Chem.

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The cubic semiconducting compounds APd 3 O 4 (A = Ca, Sr) can be hole-doped by Na substitution on the A site and driven towards more conducting states. This process has been followed here by a number of experimental techniques in order to understand the evolution of electronic properties. While an insulator-to-metal transition is observed in Ca 1−x Na x Pd 3 O 4 for x ≥ 0.15, bulk metallic behavior is not observed for Sr 1−x Na x Pd 3 O 4 up to x = 0.20. Given the very similar crystal and (calculated) electronic structures of the two materials, the distinct behavior is a matter of interest.We present evidence of local disorder in the A = Sr materials through the analysis of the neutron pair distribution function which is potentially at the heart of the distinct behavior. Solid-state 23 Na nuclear magnetic resonance studies additionally suggest a percolative insulator-to-metal transition mechanism wherein presumably small regions with a signal resembling metallic NaPd 3 O 4 form almost immediately upon Na substitution, and this signal grows monotonically with substitution. Some signatures of increased local disorder and a propensity for Na clustering are seen in the A = Sr compounds.

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“…However, with increasing temperature, the magnetic susceptibility (χ) shows two prominent features/transitions at around 90 K and 500 K [18][19][20]. The nonmagnetic to paramagnetic transition at 90 K is believed to be due to the change in the spin state of Co ions from LS to high spin state [HS; t [20][21][22][23][24][25][26][27]. The multiple spin states of Co ions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

Shukla

Dhaka

2018

Phys. Rev. B

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We report the structural, magnetic, transport and electronic properties of Nb substituted LaCo1−xNbxO3 (x = 0-0.2). The Rietveld analysis of x-ray diffraction data demonstrate structural phase transitions from rhombohedral to orthorhombic and further to monoclinic with increasing the Nb concentration up to x ≥ 0.2. Interestingly, we observed dramatic changes in the magnetization (M) with increasing the Nb concentration, as the M sharply increases below 10 K even at 2.5% substitution. Furthermore, ac susceptibility data show the spin-glass behavior in x = 0.1 sample. We find that the density of states near the Fermi level decreases and the activation energy increases, which results in the decreasing conductivity with higher Nb concentration. A significant shift in the peak position of A2g phonon mode has been observed using Raman spectroscopy, which indicates the change in the coupling due to the structural distortion with Nb substitution. The core-level photoemission study confirms that the Nb is present in 5+ valence state. Our study reveals that the nonmagnetic Nb 5+ (d 0 ) substitution converts Co 3+ ions to Co 2+ and stabilize both in the high-spin state. Our results suggest that structural and spin-state transitions as well as the difference in the ionic radii between Nb 5+ and Co 3+ are playing an important role in tuning the physical properties.

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A Localized-Electron to Collective-Electron Transition in the System (La, Sr)CoO3

Cited by 279 publications

References 5 publications

Interrelation between Structure – Magnetic Properties in La_0.5Sr_0.5CoO₃

Interrelation between Structure – Magnetic Properties in La_0.5Sr_0.5CoO₃

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

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A Localized-Electron to Collective-Electron Transition in the System (La, Sr)CoO3

Cited by 279 publications

References 5 publications

Interrelation between Structure – Magnetic Properties in La0.5Sr0.5CoO3

Interrelation between Structure – Magnetic Properties in La0.5Sr0.5CoO3

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd3O4 (A = Ca, Sr)

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

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Interrelation between Structure – Magnetic Properties in La_0.5Sr_0.5CoO₃

Interrelation between Structure – Magnetic Properties in La_0.5Sr_0.5CoO₃

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)