Fundamental difference in the electronic reconstruction of infinite-layer versus perovskite neodymium nickelate films on 
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(001)

Geisler, Benjamin; Pentcheva, Rossitza

doi:10.1103/physrevb.102.020502

Cited by 71 publications

(71 citation statements)

References 48 publications

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“…Many of the methods that were useful for characterizing cuprates, such as neutron scattering, require bulk, preferably singlecrystal, samples. The availability of superconducting nickelate single crystals would also assuage the concern that the observed superconductivity might arise from an interface effect with the substrate [20,21]. Bulk crystals would also be desirable for studying the material's phonons, whose role in high-T c superconductivity has long been debated.…”

Section: Directions For the Futurementioning

confidence: 99%

Entering the Nickel Age of Superconductivity

Norman

2020

Physics

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Section: Directions For the Futurementioning

confidence: 99%

Entering the Nickel Age of Superconductivity

Norman

2020

Physics

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“…A disparate variety of interacting models [1][2][3][4][5][6][7][8][9][10][11][12][13][14] based on density functional theory (DFT) studies [15][16][17][18][19][20][21][22] have been proposed to illuminate the electronic and magnetic behavior underlying the discovery [23] and experimental study [24][25][26] of long-sought superconductivity in a layered nickelate, specifically hole-doped NdNiO 2 (NNO). With the same infinite-layer structure as CaCuO 2 (CCO), which superconducts up to 110 K when doped [27], NNO displays several differences with CCO.…”

Section: Introductionmentioning

confidence: 99%

Fluctuation-frustrated flat band instabilities in NdNiO2

Choi

Pickett

Lee

2020

Phys. Rev. Research

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The discovery that Nd 1−x Sr x NiO 2 , with the CaCuO 2 infinite-layer structure, superconducts up to 15 K around the hole-doping level x = 0.2 raises the crucial question of its fundamental electronic and magnetic processes. The unexplained basic feature that we address is that, for x = 0 and as opposed to strongly antiferromagnetic (AFM) CaCuO 2 , NdNiO 2 with the same structure and formal d 9 configuration does not undergo AFM order. We study this issue not in the conventional manner, as energetically unfavored or as frustrated magnetic order, but as an instability of the AFM phase itself. We are able to obtain the static AFM ordered state, but find that a flat band, one-dimensional-like van Hove singularity (vHs) is pinned to the Fermi level. This situation is unusual in a non-half-filled, effectively two-band system. The vHs makes the AFM phase unstable to spindensity disproportionation, breathing, and half-breathing lattice distortions, and (innate or parasitic) chargedensity disproportionation. These flat band instabilities, distant relatives of single-band cuprate models, thereby inhibit but do not eliminate incipient AFM tendencies at low temperature. The primary feature is that a pair of active bands (d x 2 −y 2 , d z 2) eliminate half-filled physics and, due to instabilities, preclude the AFM phase seen in CaCuO 2. This strongly AFM correlated, conducting spin-liquid phase with strong participation of the Ni d z 2 orbital forms the platform for superconductivity in NdNiO 2 .

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“…Thus far, however, material synthesis remains challenging. The demonstration of perfect diamagnetism is still missing, and understanding of the role of the interface and bulk to the superconducting properties is still lacking [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . Here, we synthesized high- The search for the nickelate superconductivity was enthused by the idea of mimicking the 3 2 − 2 orbital of the single-band high-Tc cuprates 1 .…”

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confidence: 99%

“…Moreover, the DC diamagnetic response in the superconducting thin films has never been demonstrated 1 . These beg the question of whether the superconductivity occurs in the whole film or at the interface between the nickelate and SrTiO3 (STO) substrate [13][14][15][16] . Theoretical calculation further proposed that the interface/surface-induced Fermi surface modification causes the transformation from a d-wave paring in bulk into an s-wave paring at the interface/surface 2,17 , which might be consistent with the recent observation of two gaps from the tunneling spectrum measurement 5 .…”

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confidence: 99%

Observation of perfect diamagnetism and interfacial effect on the electronic structures in infinite layer Nd0.8Sr0.2NiO2 superconductors

Zeng¹,

Yin²,

Li³

et al. 2021

Preprint

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Nickel-based complex oxides have served as a playground for decades in the quest for a copper-oxide analog of the high-temperature (high-Tc) superconductivity. They may provide key points towards understanding the mechanism and an alternative route for high-Tc superconductors. The recent discovery of superconductivity in the infinite-layer nickelate thin films has fulfilled this pursuit. Thus far, however, material synthesis remains challenging. The demonstration of perfect diamagnetism is still missing, and understanding of the role of the interface and bulk to the superconducting properties is still lacking. Here, we synthesized high-quality Nd0.8Sr0.2NiO2 thin films with different thicknesses and investigated the interface and strain effects on the electrical, magnetic and optical properties. Perfect diamagnetism is demonstrated, confirming the occurrence of superconductivity in the thin films. Unlike the thick films in which the normal-state Hall coefficient (RH) changes signs as the temperature decreases, the RH of films thinner than 6.1 nm remains negative, suggesting a thickness-driven band structure modification. Moreover, X-ray absorption spectroscopy reveals the Ni-O hybridization nature in doped infinite-layer nickelates, and the hybridization is enhanced as the thickness decreases. Consistent with band structure calculations on the nickelate/SrTiO3 heterostructure, the interface and strain effect induce a dominating electron-like band in the ultrathin film, thus causing the sign change of the RH.

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Fundamental difference in the electronic reconstruction of infinite-layer versus perovskite neodymium nickelate films on SrTiO3 (001)

Cited by 71 publications

References 48 publications

Entering the Nickel Age of Superconductivity

Entering the Nickel Age of Superconductivity

Fluctuation-frustrated flat band instabilities in NdNiO2

Observation of perfect diamagnetism and interfacial effect on the electronic structures in infinite layer Nd0.8Sr0.2NiO2 superconductors

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