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apRoberts-Warren, Nicholas; Dioguardi, A. P.; Poltavets, Viktor V.; Greenblatt, Martha; Klavins, P.; Curro, N. J.

doi:10.1103/physrevb.83.014402

Cited by 38 publications

(58 citation statements)

References 13 publications

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“…Similar plateau-like behaviour has also been observed in La4Ni3O8 from approximately 180 to 100 K [13]. This has been interpreted to mean that 180 K is the onset temperature for critical antiferromagnetic fluctuations in La4Ni3O8, considering the NMR result [8].…”

Section: Resultssupporting

confidence: 75%

“…Moreover, the formal valence of Ni is +1.33 consisting of Ni + 3d 9 and Ni 2+ 3d 8 states. Despite these structural and electrical similarities with cuprates, Nd3.5Sm0.5Ni3O8 had showed neither metallic characteristic nor superconductivity [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical and experimental studies have been performed for La4Ni3O8, which has the same structure as Nd3.5Sm0.5Ni3O8 [3][4][5][6][7][8][9][10][11][12][13]. Theoretical calculations have predicted the metallic state mainly due to the Ni-3dx2-y2 orbital.…”

Section: Introductionmentioning

confidence: 99%

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Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

Kobayashi¹,

Yamamoto²,

Nakata³

et al. 2017

Proc. 17th Int. Conf. On High Pressure in Semiconductor Physics &Amp; Workshop on High-Pressure Study on Superconducting

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Nd3.5Sm0.5Ni3O8 is a candidate for high-Tc superconductor, due to the close structural and electrical similarities with high-Tc cuprates. In electrical resistivity measurement, Nd3.5Sm0.5Ni3O8 shows a semiconducting behavior. However, by intercalation and subsequent deintercalation treatments with sulfur, Nd3.5Sm0.5Ni3O8 displays metallic behavior down to 20 -40 K, followed by the weak semiconducting tendency at lower temperatures. In this study, the electrical resistivity measurements under high pressures up to 2 GPa were performed for a semiconducting sample of Nd3.5Sm0.5Ni3O8. We discuss the electrical properties of this material, combining the high-pressure resistivity data with measurements on metallic samples at ambient pressure.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

Kobayashi¹,

Yamamoto²,

Nakata³

et al. 2017

Proc. 17th Int. Conf. On High Pressure in Semiconductor Physics &Amp; Workshop on High-Pressure Study on Superconducting

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“…NMR experiments reveal the presence of spin fluctuations below 160 K 10 . From a theoretical point of view, the insulating character of La438 was accounted for in terms of a molecular high spin (HS) state with the insulator-to-metal transition being spin driven [11][12][13] .…”

mentioning

confidence: 99%

Charge ordering inNi1+/Ni2+nickelates:La4
Botana
¹
,
Pardo
²
,
Pickett
³

et al. 2016
Phys. Rev. B
52
4
46
1
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Ab initio calculations allow us to establish a close connection between the Ruddlesden-Popper layered nickelates and cuprates not only in terms of filling of d-levels (close to d 9 ) but also because they show Ni 1+ (S=1/2)/Ni 2+ (S=0) stripe ordering. The insulating charge ordered ground state is obtained from a combination of structural distortions and magnetic order. The Ni 2+ ions are in a low-spin configuration (S=0) yielding an antiferromagnetic arrangement of Ni 1+ S=1/2 ions like the long-sought spin-1/2 antiferromagnetic insulator analog of the cuprate parent materials. The analogy extends further with the main contribution to the bands near the Fermi energy coming from hybridized Ni-d x 2 −y 2 and O-p states. 7,8 . As the n=3 and n=2 members of the series, they have a formal Ni valence of +1.33 and +1.5, respectively, which being noninteger should correspond to metallic behavior, yet both are insulating. The NiO 2 slabs are separated by fluorite structure LaO blocking layers that make the inter-trilayer/bilayer coupling very weak. The lack of apical oxygen ions reduces the interplane separation substantially and opens a large crystal field splitting for the e g states with the d x 2 −y 2 state lying higher in energy than d z 2 . The d z 2 orbitals hybridize along the z direction giving rise to n molecular subbands. Depending on the relative magnitude of the crystal field splitting and Hund's rule coupling, the ground state can be either high spin (HS) and insulating or low spin (LS) and metallic as depicted in Fig.

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“…To test such ideas, a series of T′ phases R n + 1 Ni n O 2n + 2 (R = La, n = 2; R = La, Pr, and Nd, n = 3) with a square planar Ni-O environment was synthesized and studied in polycrystalline form (30)(31)(32)(33)(34)(35)(36)(37). None of these materials superconduct.…”

mentioning

confidence: 99%

Stacked charge stripes in the quasi-2D trilayer nickelate La ₄ Ni ₃ O ₈

Zhang

Chen

Phelan

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

100

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The quasi-2D nickelate La 4 Ni 3 O 8 (La-438), consisting of trilayer networks of square planar Ni ions, is a member of the so-called T′ family, which is derived from the Ruddlesden-Popper (R-P) parent compound La 4 Ni 3 O 10−x by removing two oxygen atoms and rearranging the rock salt layers to fluorite-type layers. Although previous studies on polycrystalline samples have identified a 105-K phase transition with a pronounced electronic and magnetic response but weak lattice character, no consensus on the origin of this transition has been reached. Here, we show using synchrotron X-ray diffraction on high-pO 2 floating zone-grown single crystals that this transition is associated with a real space ordering of charge into a quasi-2D charge stripe ground state. The charge stripe superlattice propagation vector, q = (2/3, 0, 1), corresponds with that found in the related 1/3-hole doped single-layer R-P nickelate, La 5/3 Sr 1/3 NiO 4 (LSNO-1/3; Ni 2.33+ ), with orientation at 45°to the Ni-O bonds. The charge stripes in La-438 are weakly correlated along c to form a staggered ABAB stacking that reduces the Coulomb repulsion among the stripes. Surprisingly, however, we find that the charge stripes within each trilayer of La-438 are stacked in phase from one layer to the next, at odds with any simple Coulomb repulsion argument.charge stripe | charge order | nickelate | strongly correlated materials | transition metal oxides C ompetition between localized and itinerant electron behavior is an organizing construct in our understanding of correlated electron transition metal oxide (TMO) physics (1-4). Some of the most compelling phenomenology in these materials occurs in the mixed valent state for the transition metal, which is set by composition, doping, and anion coordination of the metal. Many mixed valent TMOs adopt insulating "charge ordered" states, in which an inhomogeneous but long-range ordered configuration of the charge density condenses from a uniform metallic state (5). The real space pattern of charge order varies by material (6-9), but a typically observed motif is some variety of charge stripes. Such stripes have been observed in cobaltites (10-12), cuprates (13-15), nickelates (16)(17)(18)(19), and manganites (20-22), albeit with highly materials-dependent configurations that hinge on a balance among Coulomb, lattice, and magnetic exchange energies. For instance, charge stripes in layered nickelates typically stagger themselves from layer to layer to reduce the collective electrostatic energy arising from the charge disproportionation (9, 18).Indeed, the case of nickelates plays a prominent role in charge stripe physics (6-9, 16-19, 23-28), because mixed valent Ni 2+ (d 8 ) and Ni 3+ (d 7 ) compounds, such as La 2 − x Sr x NiO 4 (LSNO), are structurally and electronically related to high T c superconductors and thus, have been targeted as potential alternatives to the cuprates. Instead of superconductivity, however, the ground state of such quasi-2D, octahedrally coordinated nickelates is marked by stati...

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Critical spin dynamics in the antiferromagnetLa4Ni3O8from

Cited by 38 publications

References 13 publications

Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

Charge ordering inNi1+/Ni2+nickelates:La4
Botana
¹
,
Pardo
²
,
Pickett
³

et al. 2016
Phys. Rev. B
52
4
46
1
View full text Add to dashboard Cite

Stacked charge stripes in the quasi-2D trilayer nickelate La ₄ Ni ₃ O ₈

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Critical spin dynamics in the antiferromagnetLa4Ni3O8from

Cited by 38 publications

References 13 publications

Electrical resistivity measurements under high pressure for Nd3.5Sm0.5Ni3O8

Electrical resistivity measurements under high pressure for Nd3.5Sm0.5Ni3O8

Charge ordering inNi1+/Ni2+nickelates:La4Botana1, Pardo2, Pickett3 et al. 2016Phys. Rev. B524461View full textAdd to dashboardCite

Stacked charge stripes in the quasi-2D trilayer nickelate La 4 Ni 3 O 8

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Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

Charge ordering inNi1+/Ni2+nickelates:La4
Botana
¹
,
Pardo
²
,
Pickett
³

et al. 2016
Phys. Rev. B
52
4
46
1
View full text Add to dashboard Cite

Stacked charge stripes in the quasi-2D trilayer nickelate La ₄ Ni ₃ O ₈