Tootfinder

Strong and Engineerable Optical Anisotropy in Easily Integrable Epitaxial SrO(SrTiO 3 ) N Ruddlesden--Popper Thin Layers
Mohamed Oussama Bounab (INL - MFN), Clarisse Furgeaud (INL - MFN), S\'ebastien Cueff (INL, INL - I-Lum), Lotfi Berguiga (INL - I-Lum), Romain Bachelet (INL - MFN), Mohamed Bouras (FOTON), Laurent Pedesseau (FOTON), Jacky Even (INSA Rennes, FOTON), Ludovic Largeau (C2N), Guillaume Saint-Girons (INL - MFN)

Strong and Engineerable Optical Anisotropy in Easily Integrable Epitaxial SrO(SrTiO 3 ) N Ruddlesden--Popper Thin Layers
Optical anisotropy is a key property for numerous photonic devices. However, bulk anisotropic materials suitable for such applications remain relatively scarse and are often challenging to synthesize as thin films. Additionally, the optical losses as well as the complex structuration of anisotropic metamaterials hinder their integrability in photonic devices. Based on ellipsometry measurements coupled with reflectance, it is demonstrated here that Ruddlesden-Popper (RP) SrO(SrTiO 3 ) N phases (…

Growth optimization of Ruddlesden-Popper nickelate high-temperature superconducting thin films
Wei Lv, Zihao Nie, Heng Wang, Haoliang Huang, Qikun Xue, Guangdi Zhou, Zhuoyu Chen
https://arxiv.org/abs/2508.18107

Growth optimization of Ruddlesden-Popper nickelate high-temperature superconducting thin films
The discovery of ambient-pressure nickelate high-temperature superconductivity provides a new platform for probing the underlying superconducting mechanisms. However, the thermodynamic metastability of Ruddlesden-Popper nickelates Lnn+1NinO3n+1 (Ln = lanthanide) presents significant challenges in achieving precise control over their structure and oxygen stoichiometry. This study establishes a systematic approach for growing phase-pure, high-quality Ln3Ni2O7 thin films on LaAlO3 and SrLaAlO4 sub…

Revival of Layered Ferroelectrics in Thin Films
Elzbieta Gradauskaite
https://arxiv.org/abs/2508.20742 https://arxiv.org/pdf/2508.20742

Revival of Layered Ferroelectrics in Thin Films
Layered perovskites are a versatile class of ferroelectrics with their structural anisotropy reflected in unusual electrostatics that give rise to exceptional ferroelectric properties. These materials fall into four main families: Aurivillius, Carpy-Galy, Ruddlesden-Popper, and Dion-Jacobson phases; each forming natural superlattices by interleaving perovskite slabs with spacer layers. For a long time, these materials were considered too structurally complex to prepare as high-quality thin film…

Karl Popper in The Logic of Scientific Discovery, 1959: ‘Non-reproducible single occurrences are of no significance to science.’
XKCD in Replication Crisis, 2025: ‘Replication Crisis Solved’
#Science

Replication Crisis

Not Related! A Big-Braned Podcast: Popper, Soros and the Open Society
Video page:
https://videos.lukesmith.xyz/w/ou7J5ALMTyxEajKsFiJWio
Episode webpage:

Landau theory of the density wave transition in trilayer Ruddlesden-Popper nickelates
M. R. Norman
https://arxiv.org/abs/2506.07870 https://

Landau theory of the density wave transition in trilayer Ruddlesden-Popper nickelates
This paper presents a Landau treatment of the incommensurate density wave transition observed in trilayer Ruddlesden-Popper nickelates and uses this to address the nature of the transition. The data are consistent with a spin driven transition with the distinct intertwining of charge and spin order due to being in or proximate to the first order transition region of the Landau phase diagram. From this approach, one also obtains an understanding of the variation of the transition temperature wit…

Signatures of spin-glass superconductivity in nickelate (La, Pr, Sm)3Ni2O7 films
Haoran Ji, Zheyuan Xie, Yaqi Chen, Guangdi Zhou, Longxin Pan, Heng Wang, Haoliang Huang, Jun Ge, Yi Liu, Guang-Ming Zhang, Ziqiang Wang, Qi-Kun Xue, Zhuoyu Chen, Jian Wang
https://arxiv.org/abs/2508.16412

Signatures of spin-glass superconductivity in nickelate (La, Pr, Sm)3Ni2O7 films
The discovery of Ruddlesden-Popper (R-P) nickelate superconductors under high pressure heralds a new chapter of high-transition temperature (high-Tc) superconductivity. Recently, ambient-pressure superconductivity is achieved in R-P bilayer nickelate thin films through epitaxial compressive strain, unlocking in-depth investigations into the superconducting characteristics. Here, through electrical transport study, we report the observation of spin-glass superconductivity with hysteretic magneto…

Topotactic oxidation of Ruddlesden-Popper nickelates reveals new structural family: oxygen-intercalated layered perovskites
Dan Ferenc Segedin, Jinkwon Kim, Harrison LaBollita, Nicole K. Taylor, Kyeong-Yoon Baek, Suk Hyun Sung, Ari B. Turkiewicz, Grace A. Pan, Abigail Y. Jiang, Maria Bambrick-Santoyo, Tobias Schwaigert, Casey K. Kim, Anirudh Tenneti, Alexander J. Grutter, Shin Muramoto, Alpha T. N'Diaye, Ismail El Baggari, Donald A. Walko, Hua Zhou, Charles M. Brooks, Antia S. Bota…

Topotactic oxidation of Ruddlesden-Popper nickelates reveals new structural family: oxygen-intercalated layered perovskites
Layered perovskites such as the Dion-Jacobson, Ruddlesden-Popper, and Aurivillius families host a wide range of correlated electron phenomena, from high-temperature superconductivity to multiferroicity. Here we report a new family of layered perovskites, realized through topotactic oxygen intercalation of La_{n+1}Ni_{n}O_{3n+1} (n=1-4) Ruddlesden-Popper nickelate thin films grown by ozone-assisted molecular-beam epitaxy. Post-growth ozone annealing induces a large c-axis expansion - 17.8% for L…

Diverse polymorphism in Ruddlesden-Popper chalcogenides
Prakriti Kayastha, Erik Fransson, Paul Erhart, Lucy Whalley
https://arxiv.org/abs/2507.11300 https:…

Diverse polymorphism in Ruddlesden-Popper chalcogenides
Ruddlesden-Popper (RP) chalcogenides are stable, non-toxic candidates for optoelectronic or thermoelectric applications. The structural diversity of RP oxides is already exploited to tune properties or achieve more advanced functionalities like multiferroicity, however, little is known about the structural evolution of RP chalcogenides. In this work, we develop a high-accuracy machine-learned interatomic potential to run large-scale molecular dynamics simulations on $Ba_{n+1}Zr_nS_{3n+1}$ for $…

Lattice-charge coupling in a trilayer nickelate with intertwined density wave order
Xun Jia, Yao Shen, Harrison LaBollita, Xinglong Chen, Junjie Zhang, Yu Li, Hengdi Zhao, Mercouri G. Kanatzidis, Matthew Krogstad, Hong Zheng, Ayman Said, Ahmet Alatas, Stephan Rosenkranz, Daniel Phelan, Mark P. M. Dean, M. R. Norman, J. F. Mitchell, Antia S. Botana, Yue Cao

Lattice-charge coupling in a trilayer nickelate with intertwined density wave order
Intertwined charge and spin correlations are ubiquitous in a wide range of transition metal oxides and are often perceived as intimately related to unconventional superconductivity. Theoretically envisioned as driven by strong electronic correlations, the intertwined order is usually found to be strongly coupled to the lattice as signaled by pronounced phonon softening. Recently, both charge/spin density waves (CDW/SDW) and superconductivity have been discovered in several Ruddlesden-Popper (RP…

Out-of-plane ferroelectricity, magnetoelectric coupling and persistent spin texture in two-dimensional multiferroics
Ying Zhou, Cheng-Ao Ji, Shuai Dong, Xuezeng Lu
https://arxiv.org/abs/2507.18018

Out-of-plane ferroelectricity, magnetoelectric coupling and persistent spin texture in two-dimensional multiferroics
Two dimensional multiferroics with out of plane ferroelectricity hold significant promise for miniaturized magnetoelectric spin-orbit transistors, yet systems combining robust ferroelectricity and strong magnetoelectric coupling are exceedingly rare. Here, we demonstrate that epitaxial strain stabilizes out of plane ferroelectricity in exfoliated two dimensional Ruddlesden Popper derivatives. The hybrid improper ferroelectric Pc phase transitions to a competing P21 phase with purely in plane po…

Strain-Engineered Electronic Structure and Superconductivity in La$_3$Ni$_2$O$_7$ Thin Films
Yu-Han Cao, Kai-Yue Jiang, Hong-Yan Lu, Da Wang, Qiang-Hua Wang
https://arxiv.org/abs/2507.13694

Strain-Engineered Electronic Structure and Superconductivity in La$_3$Ni$_2$O$_7$ Thin Films
Recently, the films of the Ruddlesden-Popper (RP) nickelate superconductors, in which the (La,Pr)$_3$Ni$_2$O$_7$ system exhibits a remarkable transition temperature $T_c$ exceeding 40 K, were synthesized at ambient pressure. We systematically investigate the band structures and electronic correlation effect to identify the key factors controlling superconductivity and pathways to enhance $T_c$. Based on density functional theory (DFT) calculations, we construct a bilayer two-orbital ($3d_{3z^2-…

A rutile-based homologous series Na(PtO$_2$)$_{2\it{n} 1}$ discovered by computationally assisted high-pressure synthesis
Yasuhito Kobayashi, Hidefumi Takahashi, Shunsuke Kitou, Akitoshi Nakano, Hajime Sagayama, Yuichi Yamasaki, Shintaro Ishiwata
https://arxiv.org/abs/2508.15223

A rutile-based homologous series Na(PtO$_2$)$_{2\it{n}+1}$ discovered by computationally assisted high-pressure synthesis
Layered transition metal oxides typified by the Ruddlesden-Popper phase have been extensively studied for its applications in high-temperature superconductivity, catalysis, and battery technologies. Despite the remarkable structural diversity and catalytic functionality of platinum oxides, the exploration of layered polymorphs has remained significantly constrained mainly due to the high inertness of platinum. Here, we discover a new homologous series of layered ternary oxides, Na(PtO$_2$)$_{2\…

Multiorbital character of the density wave instability in La$_4$Ni$_3$O$_{10}$
A. Suthar, V. Sundaramurthy, M. Bejas, Congcong Le, P. Puphal, P. Sosa-Lizama, A. Schulz, J. Nuss, M. Isobe, P. A. van Aken, Y. E. Suyolcu, M. Minola, A. P. Schnyder, Xianxin Wu, B. Keimer, G. Khaliullin, A. Greco, M. Hepting
https://arxiv.org/abs/2508.06440

Multiorbital character of the density wave instability in La$_4$Ni$_3$O$_{10}$
Ruddlesden-Popper nickelates exhibit high-temperature superconductivity closely intertwined with charge and spin density wave order. However, fundamental questions persist regarding the interplay between the associated density wave (DW) fluctuations and superconductivity, as well as the orbital character and symmetry underlying the DW instabilities. Here we utilize polarized Raman scattering to investigate the phononic and electronic Raman responses of the trilayer nickelate La$_4$Ni$_3$O$_{10}…

This https://arxiv.org/abs/2503.07500 has been replaced.
initial toot: https://mastoxiv.page/@a…

Oriented 2D Ruddlesden-Popper Metal Halides by Pulsed Laser Deposition
Two-dimensional (2D) Ruddlesden-Popper (RP) Metal Halides present unique and tunable properties. However, direct and oriented synthesis is challenging due to low formation energies that lead to rapid, uncontrolled growth during solution-based processing. Here, we report the solvent-free growth of oriented and n = 1 2D $(\mbox{PEA})_2\mbox{PbI}_4$ RP films by pulsed laser deposition (PLD). In situ photoluminescence (PL) during deposition reveals formation of the n =1 phase at the ear;y stages of…

Piezomagnetism-driven magnetoelectric coupling in altermagnetic multiferroic K3Cr2F7
Ying Zhou, Hui-Min Zhang, Cheng-Ao Ji, Hongjun Xiang, Shuai Dong, James M. Rondinelli, Xue-Zeng Lu
https://arxiv.org/abs/2508.13952

Piezomagnetism-driven magnetoelectric coupling in altermagnetic multiferroic K3Cr2F7
Ferroelectric control of altermagnetism in momentum space has been studied widely, while the control of magnetism in real space of altermagnets are still rare. We present a design rule to identify multiferroicity in n=2 Ruddlesden-Popper halides. Our results show that a Jahn-Teller distortion can cooperate with oxygen octahedral rotations to break inversion symmetry, which we demonstrate in K3Cr2F7 and cation-ordered KAg2Cu2Cl7, and leads to a ferrielectric-to-ferroelectric phase transition in …

This https://arxiv.org/abs/2411.13554 has been replaced.
initial toot: https://mastoxiv.page/@a…

Possible Liquid-Nitrogen-Temperature Superconductivity Driven by Perpendicular Electric Field in the Single-Bilayer Film of La$_3$Ni$_2$O$_7$ at Ambient Pressure
The discovery of high-temperature superconductivity (SC) (HTSC) in pressurized La$_3$Ni$_2$O$_7$ with critical temperature $T_c$ higher than the boiling point of liquid nitrogen has aroused a surge in the exploration of HTSC in the Ruddlesden-Popper phase multilayer nickelates. Very recently, SC is found in the La$_3$Ni$_2$O$_7$ ultrathin film grown on the SrLaAlO$_4$ substrate with $T_c$ above the McMillan limit ($\approx 40\text{ K}$) at ambient pressure (AP), allowing various experimental in…

Boosting Photodetection via Plasmonic Coupling in Quasi-2D Mixed-n Ruddlesden-Popper Perovskite Nanostripes
Brindhu Malani S, Eugen Klein, Ronja Maria Piehler, Rostyslav Lesyuk, Christian Klinke
https://arxiv.org/abs/2507.23727

Boosting Photodetection via Plasmonic Coupling in Quasi-2D Mixed-n Ruddlesden-Popper Perovskite Nanostripes
Quasi-2D metal halide perovskites have emerged as a promising material for photodetection due to excellent optoelectronic properties, simple synthesis, and robust stability. Albeit, developing high-performance photodetectors based on low-dimensional quasi-2D metal halide perovskite nanoparticles remains challenging due to quantum and dielectric confinement effects. Several approaches have been employed to improve efficiency, with plasmonic nanostructures being among the most effective ones. The…

This https://arxiv.org/abs/2501.09255 has been replaced.
initial toot: https://mastoxiv.page/@a…

Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures
Ruddlesden-Popper bilayer nickelate thin film superconductors discovered under ambient pressure enable vast possibilities for investigating electronic structures of the superconducting state. Here, we report angle-resolved photoemission spectroscopy (ARPES) measurements of 1, 2, and 3 unit-cell epitaxial La2.85Pr0.15Ni2O7 films grown on SrLaAlO4 substates, through pure-oxygen in situ sample transportation. Evidence obtained using photons with distinct probing depths shows that conduction is loc…

Pressure and doping effects on the electronic structure and magnetism of the single-layer nickelate La$_2$NiO$_4$
J. B. de Vaulx, F. Bernardini, V. Olevano, Q. N. Meier, A. Cano
https://arxiv.org/abs/2506.23823

Pressure and doping effects on the electronic structure and magnetism of the single-layer nickelate La$_2$NiO$_4$
La$_2$NiO$_4$ is a prototypical member of the Ruddlesden-Popper nickelate series that offers a valuable reference point for elucidating the key ingredients behind the intriguing properties of these systems. However, the structural and electronic properties of La$_2$NiO$_4$ under pressure and doping remain surprisingly underexplored. Here, we investigate these properties using density-functional-theory calculations. We find that its tetragonal $I4/mmm$ structure can be stabilized, not only under…