Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session A64: Nickelates and CupratesRecordings Available
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Sponsoring Units: DCMP Chair: Oscar Barnal, Califor. State U, Los Angeles Room: Hyatt Regency Hotel -Grant Park B |
Monday, March 14, 2022 8:00AM - 8:12AM |
A64.00001: Strongly Correlated Systems with Long-Ranged Coulomb Interaction Michael Arciniaga, B S Shastry Motivated by recent experimental studies [1] of the q dependent charge density fluctuations in certain 2-dimensional cuprate materials, we extend the extremely correlated Fermi liquid theory (ECFL) to include long-ranged Coulomb interactions Vc. The t-J-Vc model studied here thus includes the effect of short-ranged Hubbard-Gutzwiller correlations and the long-ranged Coulomb interactions. Following Nozières' important work on the dielectric function, we develop an expression for the q dependent susceptibility with a novel self-energy ψ(q), satisfying the requirements arising from both low and high ω limits. Combining the above with the ECFL Green's function, we present results for the dynamical charge susceptibility, the dielectric function, the current susceptibility, the optical conductivity, and the plasma frequency over the Brillouin zone. Our study provides insight into the smearing of sharp features expected from weak coupling models and also a calculation for the first moment of the structure function and some other variables that may be available in the future. |
Monday, March 14, 2022 8:12AM - 8:24AM |
A64.00002: Hund Physics Landscape of Two-Orbital Systems Siheon Ryee, Myung Joon Han, Sangkook Choi Motivated by the recent discovery of superconductivity in infinite-layer nickelates, we study the role of Hund coupling in a quarter-filled two-orbital Hubbard model, which has been on the periphery of the attention. A region of negative effective Coulomb interaction of this model is revealed to be differentiated from three- and five-orbital models in their typical Hund metal active fillings. We identify distinctive regimes including four different correlated metals, one of which stems from the proximity to a Mott insulator, while the other three, which we call "intermediate" metal, weak Hund metal, and valence-skipping metal, from the effect of Hund coupling being away from Mottness. Defining criteria characterizing these metals is suggested, establishing the existence of Hund metallicity in two-orbital systems. |
Monday, March 14, 2022 8:24AM - 8:36AM |
A64.00003: Search for Q ~ 0 Order near a Forbidden Bragg Position in Bi2.1Sr1.9CaCu2O8+x with Resonant Soft X-ray Scattering Xuefei Guo, Sangjun Lee, Thomas A Johnson, Jin Chen, Paul Vandeventer, Ali A Husain, Fanny Rodolakis, Jessica L McChesney, Padraic Shafer, Hai Huang, Jun-Sik Lee, J Schneeloch, Ruidan Zhong, Genda Gu, Matteo Mitrano, Peter Abbamonte Identifying what broken symmetries are present in the cuprates has become a major area of research. Many authors have reported evidence for the so-called “Q ~ 0” order that involves broken inversion, mirror, chiral, or time-reversal symmetry that is uniform in space. Here we use resonant soft x-ray scattering to search for Q ~ 0 order in Bi2.1Sr1.9CaCu2O8+x by measuring the region of a forbidden Bragg peak, (0, 0, 3), which is normally extinguished by symmetry but may become allowed on resonance if valence band order is present. Using circularly polarized light, we found that this reflection becomes allowed on the Cu L3 resonance for temperatures Tc < T < T*, though remains absent in linear polarization and at other temperatures. This observation suggests the existence of spatially uniform valence band order near the pseudogap temperature. |
Monday, March 14, 2022 8:36AM - 8:48AM |
A64.00004: Electronic Structure of Higher-order Ruddlesden-Popper Nickelates Jesse Kapeghian, Chase J Hanson, Betul Pamuk, Antia S Botana, Myung-Chul Jung Nickelates have long been considered as cuprate analogs and have been extensively studied for their potential for high-temperature superconductivity. Indeed, the Ruddlesden-Popper nickelates (Rn+1NinO3n+1, R= rare-earth) have long been viewed as close cousins of the cuprates and it was recently found that the n = 5 compound (when chemically reduced into the square-planar form) exhibits superconductivity [1]. Here, we analyze the electronic structure of La-based higher-n (n=4-6) RP nickelates and scrutinize their similarities and differences with cuprates using first-principles calculations. Our results show large hole-like Fermi surfaces with dx2−y2 character that closely resemble those of optimally hole-doped cuprates. For higher n values, extra bands with dz2 orbital character appear and increase the 3D-like character of the electronic structure. These aspects highlight that this RP series can provide a means to modify the electronic ground states of nickelates by tuning their dimensionality. With their similarities and differences with cuprates, this new family of materials can potentially shed light into the physics of copper-based oxides. |
Monday, March 14, 2022 8:48AM - 9:00AM |
A64.00005: Correlated electronic structure of superconducting quintuple-layer nickelate Harrison LaBollita, Antia S Botana We present a comparative density functional theory plus dynamical mean-field theory (DFT+DMFT) study of the two known superconducting members of the rare-earth layered nickelate family: hole-doped RNiO2 (n=∞) and R6Ni5O12 (n=5). At the same nominal carrier concentration, these two materials exhibit nearly identical electronic structures and many-body correlations effects: mass enhancements, self-energies, and occupations. However, the fermiology of the quintuple-layer nickelate is more two-dimensional-like than its infinite-layer counterpart making this new superconducting quintuple-layer nickelate already more cuprate-like without the the need of chemical doping. |
Monday, March 14, 2022 9:00AM - 9:12AM |
A64.00006: Fluctuating stripes in the Hubbard model Tianyi Liu, Wen O Wang, Brian Moritz, Steven S Johnston, Edwin Huang, Thomas P Devereaux The normal state of high-Tc superconductors is characterized by various competing orders, among which charge and spin stripes are the most commonly observed and studied. The nature of stripe order and its possible interplay with superconductivity could be essential to understanding the physics of high-Tc cuprates. In this talk, we will present studies of charge and spin stripes in the Hubbard model, which is a canonical model for studying cuprates and have shown many essential features of the cuprate phase diagram. We discuss findings from exact numerical simulations of the model at finite temperatures, the alignment of the results with exact ground state simulations and experimental observations, as well as the implications for understanding the normal state from which superconductivity emerges. |
Monday, March 14, 2022 9:12AM - 9:24AM |
A64.00007: Static stripe order in the two-dimensional Hubbard-Holstein model Andy Tanjaroon Ly, James Neuhaus, Steven S Johnston, Seher Karakuzu, Peizhi Mai, Thomas A Maier The competition of coupled spin and charge orders (i.e. stripes) with unconventional superconductivity has been experimentally observed in high temperature (high-Tc) cuprate superconductors. Several state-of-the-art numerical methods have also observed these orders in single- and three-band Hubbard models. While strong electron-phonon (e-ph) coupling has been seen in the cuprates, it is unclear how they might influence stripe correlations. We study the static stripe order in the doped two-dimensional Hubbard-Holstein model using zero temperature variational Monte Carlo. We observe that the lattice degrees of freedom can enhance the charge component of the stripes while suppressing the spin component for some values of the next-nearest-neighbor hopping t′. However, we also find that VMC predicts an increased tendency towards phase separation in many instances. Our results show that e-ph interactions can be an important factor in establishing stripe or superconducting correlations in the Hubbard-Holstein model, with implications for the high-Tc cuprates. |
Monday, March 14, 2022 9:24AM - 9:36AM |
A64.00008: Second-harmonic generation study of magnetic domains in an oxychloride cuprate Kyle Seyler, Daniel van Beveren, Alon Ron, Costel R Rotundu, Young S Lee, David Hsieh We report an optical second-harmonic generation study of an oxychloride cuprate. The second-harmonic generation is sensitive to the magnetic order, which allows us to observe magnetic domains through local rotational anisotropy and wide-field imaging measurements. We will show how these magnetic domains evolve under applied magnetic fields and at different temperatures, and we will discuss microscopic origins for their behavior. |
Monday, March 14, 2022 9:36AM - 9:48AM |
A64.00009: Temperature independent pseudogap of the cuprate superconductors and NMR Marija Avramovska, Jakob Nachtigal, Juergen Haase NMR is a powerful bulk quantum probe that can give vital information about the electronic properties of materials. Well known examples are the changes of NMR shift and relaxation due to a redistribution of electronic states caused by the opening of a superconducting gap or the pseudogap in the cuprates. In the early days, the interpretation of the NMR data was led astray, to some extent, by the focus on just a few materials. By gathering all literature shift and relaxation data of the cuprates we establish a rather different NMR phenomenology. For example, planar oxygen relaxation and shift show a temperature-independent but doping dependent pseudogap at the Fermi surface. States above the pseudogap are similar for all cuprates and doping levels, and appear to be Fermi liquid-like. All data can be explained with a single spin component. Also, the deduced orbital shifts agree with first principal calculations. The planar Cu shift data shows a similarity with the oxygen data, i.e. there is a high temperature offset in the shifts for both directions of the magnetic field as demanded by a temperature independent pseudogap. However, there is a strong family dependence that is not present in the planar oxygen data. Further details including relaxation will be discussed. |
Monday, March 14, 2022 9:48AM - 10:00AM |
A64.00010: Disorder effects on the phase diagram of electron-doped cuprates using the two-particle self-consistent approach Chloé Gauvin-Ndiaye, Pierre-Antoine Graham, A.-M. S Tremblay The two-particle self-consistent approach (TPSC) is an accurate theoretical method for electronic systems that can be described by the one-band Hubbard model in the weak to intermediate coupling regime [1, 2]. In particular, it can successfully describe the electron-doped cuprates [3]. In this work, we include the effect of impurities and disorder in TPSC using the impurity averaging technique and apply it to the specific case of electron-doped cuprates. We show how disorder suppresses antiferromagnetic (AFM) fluctuations using spin correlation length and double occupancy calculations. We also show that disorder displaces the AFM quantum critical point to a smaller value of the electron doping and affects the onset of the AFM pseudogap. |
Monday, March 14, 2022 10:00AM - 10:12AM |
A64.00011: Detection of plasmon in overdoped La2-xSrxCuO4 using resonant inelastic x-ray scattering Qizhi Li, Yingying Peng, Hsiaoyu Huang, Changwei Zou, Yanwu Xie High-temperature cuprate superconductors consist of two-dimensional CuO2 planes, with anisotropic superconductivity and critical field [1]. The interlayer correlation is considered significant to promote the critical temperature [2]. In recent years, the electronic collective mode defined as plasmon has been discovered in both electron and hole doped cuprates, which has a three-dimensional dispersion and considered to be important for superconductivity[MOU1] [3,4,5]. Here we performed an extensive study on La2-xSrxCuO4 by using resonant inelastic x-ray scattering (RIXS) at O K-edge, and observed the plasmon persisting up to a highly overdoped level of x=0.45. We have also modulated the doping level by constructing the interfacial superconducting [La2-xSrxCuO4/La2CuO4] superlattice. Our results reveal a smooth evolution of the plasmon from overdoped x~0.45 to underdoped x~0.07 region with increasingly lower energies and incoherence. Our observation of plasmon in the metallic phase of cuprates suggests that plasmon is not an imperative component for superconductivity. |
Monday, March 14, 2022 10:12AM - 10:24AM |
A64.00012: Emergence of Bose Liquid in Cuprates: Low-Energy Effective Theory of the Emery Model Xinyi Li, Jinning Hou, Zijian Lang, Wei Ku We investigate the low-energy effective theory of the Emery model applicable to cuprates. In addition to the emergence of non-local many-body coupling, the kinetic processes are found to be strongly dressed. In the strong interaction regime, diagonalization of local many-body problem indicates multiple emerged mechanisms that promote the formation of tightly bound bosonic carriers. Particularly, antiferromagnetic coupling between the Cu d-orbitals plays the essential rule in binding two doped holes on an oxygen atom leading to a weakly coupled spin-boson model of emergent bose liquid. We then discuss the implication of such low-energy theory on the long-range magnetic correlation. |
Monday, March 14, 2022 10:24AM - 10:36AM |
A64.00013: Anomalies in the velocity of sound of the two-dimensional compressible Hubbard model Giovanni Sordi, Caitlin Walsh, Maxime Charlebois, Patrick Sémon, A.-M. S Tremblay The propagation of sound is a powerful tool to characterize phase transitions. We study the velocity of sound in the two-dimensional compressible Hubbard model at finite temperature with cluster dynamical mean-field theory. We find sharp anomalies in the velocity of sound as a function of the interaction strength and doping. We show that these anomalies are a signature of supercritical phenomena. They are concomitant with specific heat anomalies. We predict the existence of sound anomalies at the doping p* where the pseudogap ends in the normal state of hole-doped cuprates. |
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