Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M22: Superconductivity:Mostly_CuO_3 |
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Sponsoring Units: DCMP Chair: Sumitendra Mazumdar, University of Arizona Room: Room 214 |
Wednesday, March 8, 2023 8:00AM - 8:12AM |
M22.00001: Simulating Superconducting Properties of Overdoped Cuprates: Role of Inhomogeneity Mainak Pal, Andreas Kreisel, Bill Atkinson, Peter Hirschfeld Theoretical studies of disordered d-wave superconductors have focused, with a few exceptions, on optimally doped models with strong scatterers. Addressing recent controversies about the nature of the overdoped cuprates, however, requires studies of the weaker scattering associated with dopant atoms. Here we study simple models of such systems in the self-consistent Bogoliubov-de Gennes (BdG) framework, and compare to disorder-averaged results using the self-consistent-T-matrix-approximation (SCTMA). Despite surprisingly linear in energy behavior of the low-energy density of states even for quite disordered systems, the superfluid density in such cases retains a quadratic low-temperature variation of the penetration depth, unlike results reported recently. We trace the discrepancy to smaller effective system size employed in that work. Overall, the SCTMA performs remarkably well, with the exception of highly disordered systems with strongly suppressed superfluid density. We explore this interesting region where gap inhomogeneity dominates measurable superconducting properties, and compare with overdoped cuprates. |
Wednesday, March 8, 2023 8:12AM - 8:24AM |
M22.00002: Exploring the spin-orbit interaction in cuprate superconductors Kayla R Currier, Chiu-Yun Lin, Kenneth Gotlieb, Ryo Mori, Hiroshi Eisaki, Martin Greven, Alexei V Fedorov, Zahid Hussain, Alessandra Lanzara Strong spin-orbit coupling and electron correlations are not often found to coexist in a single material. Models of superconductivity often include spin-orbit interactions as a small perturbation. With the discovery of a non-trivial spin texture in the double layer Bi-based cuprate, the possibility of a more complex and central role of spin orbit coupling in high temperature superconductivity comes into question. Using spin- and angle-resolved photoemission spectroscopy, we examine the implications of this spin texture in other cuprates as well as discuss the possibility of a universal source of the measured polarization among this high temperature superconductor family. |
Wednesday, March 8, 2023 8:24AM - 8:36AM |
M22.00003: Single domain stripe order in a high-temperature superconductor La2−xSrxCuO4 Gediminas Simutis In the phase diagrams of lanthanum-based high-temperature cuprate superconductors, as the antiferromagnetism is suppressed, the stripe order phase appears in which the doped charges are concentrated along domain walls between antiferromagnetic regions [1]. However, one major hurdle in pinpointing the exact nature of this state has been the fact that these charge and spin density waves are always observed in a multidomain configuration, obscuring the direct determination of the intrinsic phase. |
Wednesday, March 8, 2023 8:36AM - 8:48AM Author not Attending |
M22.00004: Distribution of the low energy spin excitations in overdoped high Tc superconductor La2-xSrxCuO4 Jiaming Wang, Takashi Imai Sr-doped La2-xSrxCuO4 has been extensively studied in order to understand the mechanisms behind its high Tc superconductivity. Our earlier 63Cu nuclear quadrupole resonance (NQR) experiments showed that the spin-lattice relaxation rate 1/T1, which probes the low energy spin excitations locally, varies with NQR frequency due to the spatial variation of local hole concentration up to x~0.16 [1], but the large distribution of 1/T1 caused by growing electronic inhomogeneity made 63Cu NQR investigation difficult above x=0.16 at the time. Recent developments of the inverse Laplace transform (ILT) T1 analysis technique overcame this difficulty, and we can now deduce the density distribution function P(1/T1) of 1/T1 (i.e. the histogram of the distribution of 1/T1, and hence low energy spin excitations) [2-5]. We have carried out 63Cu NQR experiments on the 63Cu isotope enriched samples of overdoped (x>=0.16) La2-xSrxCuO4. We will report the temperature-dependence of the inhomogenous distribution of 1/T1 across the 63Cu NQR spectrum by 2-dimensionally visualizing [5] the distribution via a T1-resolved NQR lineshape. |
Wednesday, March 8, 2023 8:48AM - 9:00AM |
M22.00005: Spin fluctuations associated with the collapse of the pseudogap in a cuprate superconductor Mengze Zhu, David J Voneshen, Stephane Raymond, O. J. Lipscombe, Charles Tam, Stephen Hayden Theories of the origin of superconductivity in cuprates depend on an understanding of their normal state, which exhibits various competing orders. Transport and thermodynamic measurements on La2-xSrxCuO4 show signatures of a quantum critical point and the associated fluctuations, including a peak in the electronic specific heat versus doping, near the doping p* where the pseudogap collapses. The fundamental nature of these quantum fluctuations is unclear. Here we use inelastic neutron scattering to show that close to the superconducting critical temperature and near p*, there are very-low-energy collective spin excitations with characteristic energies of approximately 5 meV. Cooling and applying a magnetic field creates a mixed state with a stronger magnetic response below 10 meV. We conclude that the low-energy spin-fluctuations are due to the collapse of the pseudogap combined with an underlying tendency to magnetic order. We show that the large specific heat near p* can be understood in terms of collective spin fluctuations. The spin fluctuations we measure exist across the superconducting phase diagram and may be related to the strange metal behaviour observed in overdoped cuprates. |
Wednesday, March 8, 2023 9:00AM - 9:12AM |
M22.00006: Atomically-resolved interlayer charge ordering and its interplay with superconductivity along the c direction in YBa2Cu3O6.81 Ya-Ping Chiu, Chun-Chih Hsu, Bo-Chao Huang, Michael Schnedler, Ming-Yu Lai, Yuh-Lin Wang, Rafal E. Dunin-Borkowski, Chia-Seng Chang, Ting-Kuo Lee, Philipp Ebert Charge order (CO) has been recognized as one of the most important competing order in superconductive cuprates. However, the most fundamental physical mechanisms governing CO, for example, the role of so-called charge reservoir (Cu-O chain) layers in CO and the spatial interplay of CO and SC, in highly-doped YBCO are still unclear. |
Wednesday, March 8, 2023 9:12AM - 9:24AM |
M22.00007: Mechanism of Electron Pairing in Copper-Oxide High Temperature Superconductors Shane O'Mahony, Wangping Ren, Weijiong Chen, Yi Xue Chong, Xiaolong Liu, Hiroshi Eisaki, Shin-ichi Uchida, Mohammad Hamidian, Seamus Davis The CuO2 plane supporting high temperature superconductivity in the cuprates typically occurs at the base of a periodic array of edge-sharing CuO5 pyramids. In the undoped material, an antiferromagnetic insulator state is stabilized by hopping of electrons between neighboring Cu and O atoms at rate t/? and across the charge transfer energy gap E, generating ‘superexchange’ interactions of energy J ≈ (4t4)⁄E3. However, hole doping this CuO2 plane produces a very high temperature superconducting state whose electron-pairing is exceptional. A proposed explanation for the electron-pairing is that hole doping destroys magnetic order, but preserves the pair-forming superexchange interactions which are determined by the charge transfer energy scale E. Combining single-electron and electron-pair (Josephson) scanning tunneling microscopy, we can explore this hypothesis directly by atomic-scale visualization of both nP and E in Bi2Sr2CaCu2O8+x . Determining the responses of E and nP to changes in the distance δ between the planar Cu and apical O reveals the response of the electron-pair condensate to controlled variations in the charge-transfer energy. Strong quantitative agreement between these observations and predictions from strong-correlation theory of hole-doped charge-transfer insulators indicates that charge-transfer superexchange is the electron-pairing mechanism of superconductive Bi2Sr2CaCu2O8+x. |
Wednesday, March 8, 2023 9:24AM - 9:36AM |
M22.00008: Search for the ultrafast Meissner effect in driven YBa2Cu3O6.48 Sebastian Fava, Gregor Jotzu, Michele Buzzi, Giovanni De Vecchi, Thomas Gebert, Andrea Cavalleri Resonant excitation of certain phonon modes in high-Tc cuprates has been shown to induce THz optical properties reminiscent of superconductivity far above the equilibrium transition temperature. In this work, we search for a possible expulsion of a statically applied magnetic field in the photo-induced state, a response that would amount to an ultrafast Meissner effect. We make use of the Faraday effect in a magneto-optical crystal adjacent to the sample to reconstruct the strength of the magnetic field surrounding the photo-excited material. We study how the measured field expulsion depends on temperature and external magnetic field, characterizing the magnetic properties of the non-equilibrium state. |
Wednesday, March 8, 2023 9:36AM - 9:48AM |
M22.00009: Photo-induced c-axis terahertz response of stripe-ordered cuprate superconductor La1.6-xNd0.4SrxCuO4 Morihiko Nishida, Kota Katsumi, Dongjoon Song, Hiroshi Eisaki, Ryo Shimano High-Tc cuprate superconductors are known to exhibit multiple charge- and spin-ordered phases, whose interplay with superconductivity is expected to provide crucial insights on understanding high-Tc superconductivity. Stripe order that is seen in La-based cuprates is the representative case that exhibits strong competition with the superconductivity, where charge and spin are align in a form of stripes in CuO2 plane. To investigate the microscopic interplay between stripe order and superconductivity, we performed optical pump-terahertz probe spectroscopy along c-axis of stripe-ordered cuprate La1.6-xNd0.4SrxCuO4 (x = 0.12) above Tc. We found a sharp plasma edge appearing in the reflectivity spectrum just after photo-excitation, followed by redshift within a few ps. This plasma edge was observed below charge-ordering temperature TCO = 69 K. Below spin-ordering temperature TSO = 55 K, a long-lived reflectivity enhancement was identified. Based on these experimental results, we discuss the interplay between the charge/stripe order and the superconductivity. |
Wednesday, March 8, 2023 9:48AM - 10:00AM |
M22.00010: Thermal Hall conductivity of mercury-based cuprate superconductors Munkhtuguldur Altangerel, Quentin Barthélemy, Etienne Lefrancois, Jordan Baglo, Juan Vieira-Giestinhas, Dorothée Colson, Anne Forget, Cyril Proust, Louis Taillefer Measurements of the thermal Hall conductivity κxy in d-wave superconductors can be used to extract the mean free path of d-wave quasiparticles inside the superconducting state [1]. Here we report measurements of two mercury-based cuprates: single-layer Hg1201 (underdoped with Tc = 72 K) and triple-layer Hg1223 (underdoped with Tc = 78 K and 112 K). The latter holds the record for the highest critical temperature of all known superconductors (at ambient pressure), namely Tc = 133 K at optimal doping. |
Wednesday, March 8, 2023 10:00AM - 10:12AM |
M22.00011: Low-energy quasi-circular electron correlations with charge order wavelength in Bi2Sr2CaCu2O8+δ Eduardo H Da Silva Neto, Kirsty Scott, Elliot S Kisiel, Timothy J Boyle, Rourav Basak, Stefano Agrestini, Mirian Garcia-Fernandez, Jonathan Pelliciari, Jiemin Li, Genda Gu, Alexander F Kemper, Ke-Jin Zhou, Valentina Bisogni, Santiago Blanco-Canosa, Alex Frano, Fabio Boschini Charge order correlations are ubiquitous to cuprate superconductors. However, very little is still known about the dynamic behavior of these correlations and what influence they may have to the transport properties of the cuprates, such as the strange metal phase. We report high-resolution resonant inelastic x-ray scattering (RIXS) experiments that reveal the presence of dynamic electron correlations over the qx-qy scattering plane in underdoped Bi2Sr2CaCu2O8+δ with Tc=54 K. Here we use the softening of the RIXS-measured bond stretching phonon line as a marker for the presence of charge-order-related dynamic electron correlations. The experiments show that these dynamic correlations exist at energies below approximately 70 meV and are centered around a quasi-circular manifold in the qx-qy scattering plane with radius equal to the magnitude of the charge order wave vector. We also demonstrate how this phonon-tracking procedure provides the necessary experimental precision to rule out fluctuations of short-range directional order as the origin of the observed correlations. The existence of low energy quasi-circular correlations demonstrated by these experiments further promotes the concept where dynamic charge order correlations mediate the isotropic scattering responsible for the strange metal behavior of the cuprates. |
Wednesday, March 8, 2023 10:12AM - 10:24AM Author not Attending |
M22.00012: Stabiliziation of three-dimensional charge order through interplanar orbital hybridization in PrxY1-xBa2Cu3O6+δ Brandon Gunn The shape of 3d-orbitals often governs the electronic and magnetic properties of correlated transition metal oxides. In the superconducting cuprates, the planar con?nement of the dx2-y2 orbital dictates the two-dimensional nature of the unconventional superconductivity and a competing charge order. Achieving orbital-speci?c control of the electronic structure to allow coupling pathways across adjacent planes would enable direct assessment of the role of dimensionality in the intertwined orders. Using Cu L3 and Pr M5 resonant x-ray scattering and ?rst-principles calculations, we report a highly correlated threedimensional charge order in Pr-substituted YBa2Cu3O7, where the Pr f-electrons create a direct orbital bridge between CuO2 planes. With this we demonstrate that interplanar orbital engineering can be used to surgically control electronic phases in correlated oxides and other layered materials. |
Wednesday, March 8, 2023 10:24AM - 10:36AM |
M22.00013: Valence Transition Theory of the Pressure-Induced Dimensionality Crossover in Superconducting Sr{14-x}Ca{x}Cu{24}O{41} Sumitendra Mazumdar, R. Torsten Clay, Jeong-Pil Song Pressure-driven superconductivity in Sr{14-x}Ca{x}Cu{24}O{41} (SCCO), containing weakly-coupled Cu2O3 ladders, is preceded by dramatic dimensional crossover from one to two dimension that has never been understood, The ``average resistivity'' immediately prior to superconducting transition corresponds to the universal 2D resistivity h/4e^2, confirming further the 2D character of the superconducting transition. Very recent theoretical work has also shown that the quasi-long range superconducting correlations found in the two-leg single-band Hubbard ladder are absent within the multiband Hubbard ladder Hamiltonian. Taken together, these results indicate serious deficiencies of the standard theoretical approaches to superconductivity in SCCO. We present DMRG computations of coupled Cu2O3 ladders within the multiband Hubbard Hamiltonian that clearly demonstrate that the dimensionality crossover is not due to pressure-induced hole transfer from the CuO2 chains to the Cu2O3 ladders, as had been assumed previously. We further show that the dimensional crossover can only be understood within a valence transition theory, within which there occurs a pressure-driven transition in Cu-ion ionicity from +2 to +1, with transfer of holes from Cu to O-ions. Following the valence transition, the system consists of a two-dimensional strongly correlated 1/4-filled oxygen sublattice. We discuss the implications of our results for hole- and electron-doped layered cuprates. |
Wednesday, March 8, 2023 10:36AM - 10:48AM |
M22.00014: Detection of a two phonon process in a cuprate superconductor via polarimetric RIXS Kirsty Scott, Eduardo H Da Silva Neto, Fabio Boschini, Elliot S Kisiel, Alex Frano, Matteo Minola, Stefano Agrestini, Mirian Garcia-Fernandez, Ke-Jin Zhou, Kurt Kummer, Flora Yakhou, Nicholas B Brookes Recent advances in Resonant Inelastic X-ray Scattering (RIXS), such as increased energy resolution near the Cu-L3 edge, have enabled the study of the electron-phonon coupling associated with the bond-stretching mode at ~70meV in underdoped cuprate superconductors and, in particular, the mode’s coupling to the electronic charge order. In this work, we detect and investigate an unexplored mode at ~140meV in an underdoped Bi2Sr2CaCu2O8+δ cuprate superconductor. The mode’s occurrence at approximately twice the energy of the single phonon hints at a two-phonon process. However, the 140meV energy scale is similar to the charge order gap reported from Raman scattering and could also be the result of excitations across the pseudogap. Utilizing high energy resolution momentum mapping and polarimetric RIXS, we demonstrate that this mode originates from a two-phonon process. |
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