Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session T16: Competing Orders in the Cuprate and Nickelate Superconductors |
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Sponsoring Units: DCMP Chair: Benjamin Geisler, University of Florida Room: M100G |
Thursday, March 7, 2024 11:30AM - 11:42AM |
T16.00001: Model of the commensurate charge-density wave in bilayer cuprate superconductors Richard A Klemm, Timothy J Haugan We propose a two-layer Ising model of the commensurate charge-density wave (CCDW) that can form in bilayer cuprate superconductors such as YBa2Cu3O7-δ (YBCO) and Bi2Sr2CaCu2O8+δ (Bi2212). The excess oxygen concentrations on neighboring oxygen sites within the superconducting CuO2 layers is opposite in sign, and is represented in this model by the repulsive interaction J. There is also a repulsive interaction J' between excess oxygen concentrations on near-neighbor interlayer sites, where J' > J. We calculated the partition function for continuous blocks of NM11 sites within the same layer and NM12 sites containing both layers. We found that for all of the blocks studies, in the limit that J'→ ∞, the effective coupling between the intralayer oxygen sites becomes 2J. This implies that the bilayer cuprates are likely to have a stronger CCDW that are single layer cuprates such as Bi2Sr2-xLaxCuO6+y (Bi2201). This implies also that the enhanced emission power observed in underdoped Bi2212 may be stabilized by the CCDW. In addition, the spatial form of the CCDW has dx2-y2 symmetry that is rotated by 45°from the Cu-Cu near-neighbor directions, suppressing the superconducting order parameter in those directions. In addition, the symmetry of the CCDW is difficult to distinguish from the orbital symmetry of the superconducting order parameter, and has likely confused many workers. |
Thursday, March 7, 2024 11:42AM - 11:54AM |
T16.00002: The fate of superconductivity and charge order in underdoped YBa2Cu3O6.7 under high magnetic fields Christoph Meingast, Anmol Shukla, Thom Ottenbros, Steffen Wiedmann, Matthieu Le Tacon, Bernhard Keimer, Frederic Hardy Due to the small coherence lengths, large anisotropies and high critical temperatures cuprate superconductors exhibit extremely strong superconducting fluctuations. High-resolution capacitance dilatometry on YBa2Cu3Ox has proven to be particularly useful in studying these fluctuation [1-3]. At optimal doping the sc transition is described well by a 3D-XY phase-ordering transition (analogous to the lambda transition in superfluid 4He) [1,2]. For underdoped crystals fluctuations increase and were attributed to anisotropic 3D-XY behavior [3]. Here, using magnetostriction measurements up to 30 T, we investigate how large a magnetic field is necessary to suppress the superconducting transition in an underdoped crystal with an oxygen content of 6.7. We find that 30 T is far from sufficient to fully suppress the transition, in stark contrast to previous work claiming an Hc2 of roughly 20-25 T for this doping [4,5]. Further, we see little thermodynamic evidence in the magnetostriction data at 10 K for a field-induced charge-ordering transition [6]. |
Thursday, March 7, 2024 11:54AM - 12:06PM |
T16.00003: A mechanism for Planckian metal phase in overdoped cuprate superconductors Chung-Hou Chung, Yung-Yeh Chang The mysterious strange metallic state showing perfect T-linear resistivity and an associated universal scattering rate 1/τ = 2 π α kb T/h with α ~1 a constant prefactor (h being Planck's constant) as well as logarithmic-in-temperature singular specific heat coefficient, so-called “Planckian metal state” was observed in various overdoped high-Tc cuprate superconductors [1]. The microscopic origin of these exotic behaviors remains elusive. Here, we offer a mechanism for this phenomenon based on quantum critical charge fluctuations within slave-boson approach to the two-dimensional t-J model. This model is further mapped onto an effective Kondo-Heisenberg-like model Hamiltonian. Via perturbative renormalization group analysis of the effective model, a quantum critical Planckian metal phase over a finite range in hole doping is realized near a localized-delocalized (Kondo breakdown) transition where bosonic charge (effective Kondo) fluctuations coupled to conduction band and gapless fermionic spinons [2]. The relevance of our results for overdoped high-Tc cuprate superconductors is discussed. |
Thursday, March 7, 2024 12:06PM - 12:18PM |
T16.00004: Atomic fluctuations reveal phase transitions in underdoped YBCO Zach Porter, Lingjia Shen, Nicolas G Burdet, Rajan Plumley, Alexander N Petsch, Jiajia Wen, Nathan C Drucker, Cheng Peng, Xiaoqian M Chen, Andrei Fluerasu, Elizabeth Blackburn, Giacomo Coslovich, David G Hawthorn, Joshua J Turner Glassy, fluctuating charge order is intertwined with superconductivity in underdoped YBa2Cu3O6+y (YBCO). Here we report momentum-resolved measurements of slow atomic fluctuations using the x-ray photon correlation spectroscopy (XPCS) technique. We provide evidence of sensitivity to charge ordering, and surprisingly, to the onset of superconductivity. We discuss new insights into the complex phase competition in the cuprate superconductors. |
Thursday, March 7, 2024 12:18PM - 12:30PM |
T16.00005: Charge order in the highly overdoped region of the cuprate superconductor La2-xCaxCuO4 Sajna Hameed, Yiran Liu, Gideok Kim, Ksenia S Rabinovich, Kazuki Higuchi, Nicholas B Brookes, Eugen Weschke, Flora Yakhou, Alexander Boris, Bernhard Keimer, Matteo Minola The interplay between charge density wave (CDW) order and superconductivity in cuprates has been a subject of wide debate. Most early studies observed the disappearance of CDW just above optimal doping and well below the doping at which superconductivity disappears [1]. This brought into question the role of CDW in shaping the superconducting dome of the cuprates. Intriguingly, several recent studies in overdoped cuprates have found the existence of CDW in the overdoped regime [1-5], thus reviving the question of CDW as an order competing against superconductivity also on the overdoped side of the phase diagram. In this talk, I will report on our resonant x-ray scattering study of CDW in highly overdoped La2-xCaxCuO4 thin films, in which superconductivity remarkably persists to a doping of at least x ~ 0.50 [6]. We find that CDW persists to a doping at least as high as x = 0.50, with a domain pattern that is distinct from that observed in bulk single crystals. Furthermore, the charge ordering wavevector is observed to lock into a commensurate q ~ 0.25 at high doping, and the onset temperature is observed to increase to above room temperature for x > 0.30. I will discuss the general implications of these findings. |
Thursday, March 7, 2024 12:30PM - 12:42PM |
T16.00006: Anomalous lattice dynamics in superconducting La1.84Sr0.16CuO4 Alexander N Petsch, Lingjia Shen, Zach Porter, Fabian Westermeier, Michael Sprung, Zhe Ren, Joshua J Turner Although Lanthanum-based cuprates represent the first discovered high-Tc superconductors, they are still not fully understood, with even their microscopic lattice structures still under debate. There a variety of different orders coexist, favoring one structure over the other, partially even competing with superconductivity. Here, we present recent x-ray photon correlation spectroscopy measurements on optimally-doped La1.84Sr0.16CuO4 which probes slow lattice dynamics. A rapid change in lattice dynamics and speckle contrast entering the superconducting state are shown, indicating a change from slower, cascade-like relaxation towards faster, more localized lattice relaxation with fluctuations driven by superconducting order. This underpins the influence of the superconductivity on the lattice stability and suggests an even higher importance of electron-lattice coupling than previously considered. |
Thursday, March 7, 2024 12:42PM - 12:54PM |
T16.00007: Resolving the Pseudogap in theYxP r1-xBa2Cu3O7-δ system. Francisco J Canales, Oscar Bernal, Benjamin Begay, Benjamin A Saack-LaVelle, John Y Wei, Armond Khodagulyan, Christopher Orosco, Chao C Zhang
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Thursday, March 7, 2024 12:54PM - 1:06PM |
T16.00008: Evolution of nematic order through the pseudogap phase in stripe-ordered cuprate superconductors Naman K Gupta, Christopher McMahon, Ronny Sutarto, Rantong Gong, Qianli Ma, Amirreza Ataei, Martin Bluschke, Andrea Damascelli, Bruce D Gaulin, Louis Taillefer, Roger G Melko, David G Hawthorn Electronic nematic order – evidenced by the breaking of rotational symmetry of the electronic structure – has now been reported in several cuprate superconductors. Resonant x-ray scattering (RXS) measurements in the low temperature tetragonal (LTT) structural phase of Nd-doped (La, Sr)2CuO4 has established a correlation between the pseudogap phase of the cuprates and the observation of nematicity in overdoped samples, with nematicity vanishing above the pseudogap onset temperature T∗ and doping p∗. Here we employ RXS measurements over a wider range of Sr doping, covering more heavily underdoped samples in related materials, (La, Ba)2CuO4 and Eu-doped (La, Sr)2CuO4. Notably, Eu-doped (La, Sr)2CuO4 has a larger LTT transition temperature than Nd-LSCO, but otherwise similar structure and electronic structure. In overdoped samples, these measurements confirm the previous findings in Nd-LSCO, showing evidence for nematic order to vanish above T∗ and p∗, as well as a crossover in the structural phase transition from 1st order to 2nd order. We also confirm a cooperative coupling between the Qx = Qy = 0 electronic nematic order and CDW order, which breaks both rotational and translational symmetry. In contrast to overdoped samples, in heavily underdoped samples deep within the pseudogap phase, we observe a temperature-independent nematic susceptibility, which is interpreted as a regime of strong and saturated nematic order. These results are discussed in the context of Ginzburg-Landau theory to provide insights into the doping dependence of electronic and structural symmetry breaking. |
Thursday, March 7, 2024 1:06PM - 1:18PM |
T16.00009: Oxygen ordered phases and resonant scattering measurements of the infinite-layer nickelates Christopher T Parzyck, Naman K Gupta, Yi Wu, Vivek Anil, Lopa Bhatt, Michael Bouliane, Rantong Gong, Benjamin Z Gregory, Aileen Luo, Ronny Sutarto, Feizhou He, Yi-De Chuang, Tao Zhou, Gervasi Herranz, Lena F Kourkoutis, Andrej Singer, Darrell G Schlom, David G Hawthorn, Kyle M Shen Materials hosting unconventional and high Tc superconductivity demonstrate complex phase diagrams where superconductivity cooperates and competes with other ground states involving entangled charge, lattice, and spin degrees of freedom. The infinite-layer nickelates, RENiO2, RE=La, Nd, Pr, offer a novel platform to study the nature of high Tc superconductivity and the normal state from which it emerges – possibly allowing discernment of the universal elements of the high Tc phase diagram. While the normal state of the infinite-layer nickelates shows noticeable differences from that of the cuprates (lacking a long-range ordered AFM insulating phase), recent work has shed light on some of the similarities, including the presence of magnetic fluctuations and a purported charge ordered phase in the undoped material. However, this class of materials poses significant synthesis challenges which must be overcome to reveal their intrinsic ground state properties. Here, we discuss the synthesis of perovskite and infinite-layer nickelates by reactive oxide molecular beam epitaxy and activated hydrogen reduction. We then reexamine the presence of charge density wave order in NdNiO2 and, using a multimodal approach, show that the previously reported 3a0 ordering can be attributed to interstitial oxygen ordering rather than a correlation driven density wave. |
Thursday, March 7, 2024 1:18PM - 1:30PM |
T16.00010: Electronic Structure of Topological Defects in the Pair-Density-Wave (PDW) Superconductor Marcus Rosales, Eduardo H Fradkin The cuprates display a rich phase diagram supporting many kinds of orders, some of which co-exist. Generically, certain regions of the cuprates phase diagrams support both charge-density-wave (CDW) and superconducting (SC) orders, which are typically thought of as competing with one another. It has been proposed that certain CDWs are composite order parameters secondary to an elusive phase of matter: the pair-density-wave (PDW) state. The PDW is an exotic superconducting order where the Cooper pairs have a finite COM momentum, resulting in a gap function which oscillates in space. Studying the quasi-particle structure of the topological defects of the PDW phase we discuss smoking gun signatures associated with this state of matter and their relevance to experiment. In this talk we will discuss the experimental signatures in the tunneling density of states and in the electron spectral functions as experimental tools to detect the signatures of the PDW state in its topological defects. |
Thursday, March 7, 2024 1:30PM - 1:42PM |
T16.00011: Mean-field study of pair density wave order in multiband models Nicole S Ticea, Yi-Ming Wu, Srinivas Raghu One of the indispensable ingredients for pair density wave (PDW) superconductivity is the presence of an attractive pairing interaction, i.e. attraction in the BCS channel, at finite momentum. Here we show that in multiband systems, this condition can be met with straightforward electron-density interactions. The electron-density interaction, when projected to the band basis, acquires form factors with nontrivial momentum dependence and thereby exhibits a potential tendency to a finite-momentum pairing instability. By applying a mean-field analysis to two simple multiband models, we find that PDW order can indeed become the leading instability over a wide range of interaction parameters. Moreover, the condition for the transition from a uniform superconductor to a PDW superconductor is shown via a simple quantum geometric argument. |
Thursday, March 7, 2024 1:42PM - 1:54PM |
T16.00012: Pair density wave, FFLO, and re-entrance in multi-orbital superconductors Jonathan Clepkens, Hae-Young Kee In a spin-singlet superconductor, finite-momentum superconductivity, known as the FFLO phase, arises as a field-driven instability of the uniform state. In contrast, finite-momentum spin-triplet pairing can not be stabilized in the same way due to the different pair-breaking effects of the field on a triplet state. However, finite-momentum pairing in zero field, a pair-density wave, has been conjectured to be present in a variety of correlated materials of interest. Nonetheless, this phenomenon remains relatively less explored. Here we study how such a state can arise in a correlated multi-orbital system in the presence of the magnetic field and spin-orbit coupling. We show how the pair density wave and FFLO phases, as well as field-induced and re-entrant phases for large fields arise in correlated metals. The application to several correlated materials of interest is briefly discussed. |
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