Improved conductivity of infinite-layer LaNiO2 thin films by metal organic decomposition

Ikeda, Ai; Manabe, Takaaki; Naito, Makio

doi:10.1016/j.physc.2013.09.007

Cited by 42 publications

(40 citation statements)

References 22 publications

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“…In structurally related compounds -type high-cuprate and LaNiO 2 , removal of the additional apical oxygen causes the shrinkage of -axis length [18][19][20][21][22]. In Nd 3.5 Sm 0.5 Ni 3 O 8 the shrinkage of -axis has been observed (from 25.275(2) to 25.258(5)Å) by sulfur-deintercalation.…”

Section: Resultsmentioning

confidence: 99%

The First Observation of Metallic Behaviour in Nd_3.5Sm_0.5Ni₃O₈

Nakata

Yano

Yamamoto

et al. 2016

Advances in Condensed Matter Physics

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In Nd3.5Sm0.5Ni3O8which has basically the same crystal structure and the similar electrical configuration (Ni+3d9/Ni2+3d8mix valence state) with high-Tccuprate, it has been found that this material shows metallic behaviour down to about 20 K by intercalation and subsequent deintercalation with sulfur. This is the first observation of the metallic state in this system. It is unclear why sulfur-intercalation and deintercalation induce the metallic state. We speculate that sulfur works as an effective getter for removing the interstitial apical oxygen which impedes the metallic conduction. However, the weak localization of carriers in the NiO2planes still remains below 20 K and the localization may be one of the obstacles to occurrence of possible superconductivity.

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Section: Resultsmentioning

confidence: 99%

The First Observation of Metallic Behaviour in Nd_3.5Sm_0.5Ni₃O₈

Nakata

Yano

Yamamoto

et al. 2016

Advances in Condensed Matter Physics

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“…Taking into account the simplicity and low cost of MOD, it is a quite attractive method to synthesize high-qualityRENiO 3 thin films. We have also demonstrated that these MOD films are suitable as precursors for topotactic transformation to infinite-layer RENiO 2[29].…”

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confidence: 82%

Epitaxial strain effect in perovskite RENiO3 films (RE= La–Eu) prepared by metal organic decomposition

Ikeda

Manabe

Naito

2014

Physica C: Superconductivity and its Applications

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We report the synthesis of perovskite RENiO 3 films (RE = La, Pr, Nd, Sm, and Eu) by metal organic decomposition (MOD). The RENiO 3 family is an ideal system for studying the metal-insulator transition due to the simplicity of the materials. One of the drawbacks is that the bulk synthesis of the RENiO 3 requires processing at high oxygen pressures to stabilize Ni 3+. Fundamentally, MOD is similar to solid-state reaction, but it turned out that the MOD synthesis tends to stabilize RENiO 3 without the need for high oxygen pressure. The films prepared by MOD show high crystallinity and low resistivity. Furthermore, we have investigated the epitaxial strain effect and observed a dramatic effect in PrNiO 3 and NdNiO 3 films on LaAlO 3 substrates. The metal-insulator transition in the PrNiO 3 films on LaAlO 3 is fully suppressed, whereas the metal-insulator transition temperature is considerably lowered in the NdNiO 3 films on LaAlO 3 .

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“…This implies that the large Fermi surface dominates R H at this doping, consistent with what is found in the cuprates. In contrast, for the undoped material, values of R H near zero temperature of −4.6 [7] and −7.0 × 10 −3 cm −3 =C [6,12] have been reported. This is inconsistent with the presence of a large holelike Fermi surface.…”

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confidence: 85%

“…Still, doubts have been raised that RNiO 2 would be cuprate analogs. Available transport data indicate that LaNiO 2 is not a charge-transfer insulator [6,7] and there is no experimental evidence for antiferromagnetic order in any RNiO 2 material [8]. Electronic-structure calculations of LaNiO 2 indicate significant differences from CaCuO 2 due to the presence of low-lying La 5d states, as well as an increased splitting between Ni d and O p levels [9][10][11].…”

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confidence: 99%

Similarities and Differences between LaNiO2 and CaCuO2 and Implications for Superconductivity

2020

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The recent observation of superconductivity in hole-doped NdNiO 2 has generated considerable attention. The similarities and differences between this infinite-layer nickelates and cuprates are still an open question. To address this issue we derive, via-principles calculations, essential facts related to the electronic structure and magnetism of RNiO 2 (R ¼ La, Nd) in comparison to their cuprate analog CaCuO 2. From this detailed comparison, we find that RNiO 2 are promising as cuprate analogs. Besides the much larger d − p energy splitting, and the presence of R 5d states near the Fermi energy in the parent compound, all other electronic-structure parameters seem to be favorable in the context of superconductivity as inferred from the cuprates. In particular, the large value of the longer-range hopping t 0 and the e g energy splitting are similar to those obtained in cuprates. Doping further acts to increase the cupratelike character of these nickelates by suppressing the self-doping effect of the R 5d bands.

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Improved conductivity of infinite-layer LaNiO2 thin films by metal organic decomposition

Cited by 42 publications

References 22 publications

The First Observation of Metallic Behaviour in Nd_3.5Sm_0.5Ni₃O₈

The First Observation of Metallic Behaviour in Nd_3.5Sm_0.5Ni₃O₈

Epitaxial strain effect in perovskite RENiO3 films (RE= La–Eu) prepared by metal organic decomposition

Similarities and Differences between LaNiO2 and CaCuO2 and Implications for Superconductivity

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Improved conductivity of infinite-layer LaNiO2 thin films by metal organic decomposition

Cited by 42 publications

References 22 publications

The First Observation of Metallic Behaviour in Nd3.5Sm0.5Ni3O8

The First Observation of Metallic Behaviour in Nd3.5Sm0.5Ni3O8

Epitaxial strain effect in perovskite RENiO3 films (RE= La–Eu) prepared by metal organic decomposition

Similarities and Differences between LaNiO2 and CaCuO2 and Implications for Superconductivity

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The First Observation of Metallic Behaviour in Nd_3.5Sm_0.5Ni₃O₈

The First Observation of Metallic Behaviour in Nd_3.5Sm_0.5Ni₃O₈