Phase Diagram and Superconducting Dome of Infinite-Layer 
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 Thin Fil

Zeng, Shengwei; Tang, Chi Sin; Yin, Xinmao; Li, Changjian; Li, Mengsha; Huang, Zhen; Hu, Junfei; Liu, Wei; Omar, Ganesh Ji; Jani, Hariom; Lim, Zhi Shiuh; Han, Kun; Wan, Dongyang; Yang, Ping; Pennycook, Stephen J.; Wee, Andrew Thye Shen; Ariando, Ariando

doi:10.1103/physrevlett.125.147003

Cited by 250 publications

(193 citation statements)

References 47 publications

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“…Overall, all three estimates of J lie within 60-140 meV and we conclude that the d 9 Finally, we compare the J value with that of the cuprates. In the cuprates, the magnitude of J is intensively studied by Raman spectroscopy in the early stage [82][83][84].…”

Section: J In D 9 Nickelatesmentioning

confidence: 60%

“…However, it should be noted that the origin of small J in NdNiO 2 may be ascribed to another notable difference from the cuprates, namely, NdNiO 2 is not a Mott insulator due to the self-doping effect. In NdNiO 2 , orbitals in the Nd layer form extra Fermi pockets on top of the large Fermi surface formed by the Ni 3d x 2 −y 2 orbital and the Ni 3d x 2 −y 2 orbital is hole doped, i.e., the filling of the Ni 3d orbitals deviates from d 9 [14,15,19,33,49,56]. The self-doping naturally explains the absence of Mott insulating behavior in NdNiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The discovery of superconductivity in doped nickel oxides Nd 0.8 Sr 0.2 NiO 2 [1,2] has attracted intensive interest in both experiment [3][4][5][6][7][8][9][10][11][12][13] and theory [3, because the nickelate might be an analog of the well-known high-T c superconductor, cuprates. Recently, the doping dependence has been explored both theoretically [37] and experimentally [8,9] and the presence of the superconducting dome has been confirmed [8,9]. The maximum superconducting transition temperature T c is about 15 K, not very high compared to that of the high-T c cuprates.…”

Section: Introductionmentioning

confidence: 99%

“…The self-doping naturally explains the absence of Mott insulating behavior in NdNiO 2 . Although it has been shown that the Ni 3d x 2 −y 2 orbital forms a two-dimensional strongly correlated system [17], J at the d 9 configuration with a half-filled d x 2 −y 2 orbital is masked by the self-doping. The experimental estimate should be understood as the J value including the effect of the self-doping, not the J value at the ideal d 9 configuration.…”

Section: Introductionmentioning

confidence: 99%

“…We show that the three independent estimates show reasonable agreement and conclude that the d 9 nickelates have a sizable J (about 100 meV), which is not far smaller than that of the cuprates. Therefore, the proposed d 9 nickelates provide an interesting playground to explore the cuprate-analog high-T c superconductivity.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic exchange coupling in cuprate-analog d9 nickelates

Nomura

Nomoto

Hirayama

et al. 2020

Phys. Rev. Research

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Motivated by the recent discovery of superconductivity in doped NdNiO 2 , we study the magnetic exchange interaction J in layered d 9 nickelates from first principles. The mother compounds of the high-T c cuprates belong to the charge-transfer regime in the Zaanen-Sawatzky-Allen diagram and have J larger than 100 meV. While this feature makes the cuprates very different from other transition metal oxides, it is of great interest whether layered d 9 nickelates can also have such a large J. However, one complexity is that NdNiO 2 is not a Mott insulator due to carrier doping from the block layer. To compare the cuprates and d 9 nickelates on an equal basis, we study RbCa 2 NiO 3 and A 2 NiO 2 Br 2 (A denotes a cation with a valence of 2.5+), which were recently designed theoretically by block-layer engineering. These nickelates are free from the self-doping effect and belong to the Mott-Hubbard regime. We show that these nickelates share a common thread with the high-T c cuprates in that they also have a significant exchange interaction J as large as about 100 meV.

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Section: J In D 9 Nickelatesmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetic exchange coupling in cuprate-analog d9 nickelates

Nomura

Nomoto

Hirayama

et al. 2020

Phys. Rev. Research

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Incommensurate Magnetic Order in Hole‐Doped Infinite‐Layer Nickelate Superconductors due to Competing Magnetic Interactions

Zhang

et al. 2023

Adv Funct Materials

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The discovery of superconductivity in hole‐doped infinite‐layer nickelates has fueled intense research to identify the critical factor responsible for high‐Tc superconductivity. Magnetism and superconductivity are closely entangled, and elucidating the magnetic interactions in hole‐doped nickelates is critical for understanding the pairing mechanism. Here, these calculations based on the generalized Bloch theorem (GBT) and magnetic force theorem (MFT) consistently reveal that hole doping stabilizes an incommensurate (IC) spin state and increases the IC wave vector continuously, in a way strikingly similar to hole‐doped cuprates. Going further, a nonlinear Heisenberg model including first‐neighbor and third‐neighbor in‐plane magnetic interactions is developed. The analytical solutions successfully reproduce GBT and MFT results and reveal that the competition between the two magnetic interactions is the decisive factor for the IC magnetic transition. Eventually, by analyzing the doping‐controlled spin splitting of band and orbital‐contributed exchange interactions, direct links between hole doping, magnetization, exchange constants, and magnetic order are established. This discovery of the IC spin state, new understanding of its electronic origin, and establishment of direct connection with the paring electrons radically change the current understanding of the magnetic properties in hole‐doped NdNiO2 and open new perspectives for the superconducting mechanism in nickelates superconductors.

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Topotactic Transition: A Promising Opportunity for Creating New Oxides

Meng

Yan

Qin

et al. 2023

Adv Funct Materials

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Topotactic transition is a structural phase change in a matrix crystal lattice mediated by the ordered loss/gain and rearrangement of atoms, leading to unusual coordination environments and metal atoms with rare valent states. As early as in 1990s, low temperature hydride reduction is utilized to realize the topotactic transition. Since then, topological transformations are developed via multiple approaches. Especially, the recent discovery of the Ni‐based superconductivity in infinite‐layer nickelates has greatly boosted the topotactic transition mean to synthesizing new oxides for exploring exotic functional properties. In this review, a detailed and generalized introduction is provided to oxygen‐related topotactic transition. The main body of the review includes four parts: the structure‐facilitated effects, the mechanism of the topotactic transition, some examples of topotactic transition methods adopted in different metal oxides (V, Mn, Fe, Co, Ni) and the related applications. This study is to provide timely and thorough strategies to successfully realize topotactic transitions for researchers who are eager to create new oxide phases or new oxide materials with desired functions.

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Phase Diagram and Superconducting Dome of Infinite-Layer Nd1−xSrxNiO2 Thin Fil

Cited by 250 publications

References 47 publications

Magnetic exchange coupling in cuprate-analog d9 nickelates

Magnetic exchange coupling in cuprate-analog d9 nickelates

Incommensurate Magnetic Order in Hole‐Doped Infinite‐Layer Nickelate Superconductors due to Competing Magnetic Interactions

Topotactic Transition: A Promising Opportunity for Creating New Oxides

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