Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session C08: Superconductivity: Copper Oxide - Pseudogap |
Hide Abstracts |
Sponsoring Units: DMP DCMP Chair: Pengcheng Dai, Rice University Room: BCEC 150 |
Monday, March 4, 2019 2:30PM - 2:42PM |
C08.00001: Field-induced transitions from superconductors to Bose metal in La1.875Ba0.125CuO4 John Tranquada, Yangmu Li, Genda Gu, Qiang Li, Alexei Tsvelik, Jasminka Terzic, Paul G. Baity, Dragana Popovic What happens to the pairing correlations in a cuprate superconductor when superconducting order is suppressed with a magnetic field? We have studied this problem in LBCO x=1/8, where 2D superconductivity appears below 40 K, but 3D order only occurs below 5 K, presumably due to pair-density-wave order intertwined with the spin- and charge-stripe orders. At T = 0.35 K, a c-axis magnetic field initially induces finite dissipation near 10 T, followed by re-entrant 2D superconductivity between 18 and 22 T [1]. The resistance per CuO2 plane rises to h/(4e2) near 31 T, but then saturates at 2h/(4e2) at higher fields. The saturation of the resistance indicates metallic behavior, but the fact that the Hall coefficient is ~ 0 indicates a lack of quasiparticles. We conclude that conduction is by incoherent hopping of pairs between charge stripes, indicating that stripes are good for pairing, but not phase coherence. |
Monday, March 4, 2019 2:42PM - 2:54PM |
C08.00002: The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in
Electron- and Hole-Doped Copper Oxides. Sumitendra Mazumdar I propose an integrated theoretical approach to spatial broken symmetries and |
Monday, March 4, 2019 2:54PM - 3:06PM |
C08.00003: The Effect of Uniaxial Pressure on the High-Temperature Superconductor YBa2Cu3O7−x Mark E Barber, Toshinao Loew, Hun-ho Kim, Marcin Konczykowski, Bernhard Keimer, Andrew Mackenzie, Clifford Hicks The phase diagram of the high-temperature cuprate superconductors encompasses a variety of intertwined phases. Typically the phase diagram is traversed using chemical doping or magnetic field, but uniaxial pressure offers an alternative clean tuning parameter. Recently, large a-axis uniaxial pressures in YBa2Cu3O6.67 have been shown to stabilise a three-dimensional long-range-ordered charge density wave, analogous to that achieved with large c-axis magnetic fields, but at zero field [1]. Using GaAs-based Hall probe susceptometers, we have investigated the strain dependence of ∼1/8-doped YBCO with high spatial precision, up to pressures of at least 1.5 GPa, crossing the transition into long-range CDW order. |
Monday, March 4, 2019 3:06PM - 3:18PM |
C08.00004: Investigations of the pseudogap phase in overdoped Bi2+xSr2−xCaCu2O8+δ with μSR Shayan Gheidi, Kolawole Abayomi Akintola, Andre Cote, Alex Fang, Sarah R Dunsiger, Jeff Sonier A recent μSR study of Bi2+xSr2−xCaCu2O8+δ (Bi2212) single crystals revealed the presence of weak quasi-static magnetism in the pseudogap (PG) phase [A. Pal et al., Phys. Rev. B 97, 060502(R) (2018)]. However, it is unclear whether the magnetism is associated with the PG, as muon diffusion above T ~ 160 K prevented determination of an onset temperature. In an attempt to circumvent this limitation, we have carried out sensitive muon Knight-shift and new zero-field muon spin relaxation (ZF-μSR) measurements of overdoped Bi2212. The temperature dependence of the muon-Knight shift in the normal state exhibits a saturation below a temperature that scales with Tc, whereas the ZF-μSR relaxation rate appears to track the hole-doping dependence of the PG temperature T*. In addition, our measurements of highly overdoped Bi2212 provide evidence for phase separation. The results suggest the presence of two distinct phases above Tc. |
Monday, March 4, 2019 3:18PM - 3:30PM |
C08.00005: Magnetic Excitations in Highly Underdoped Superconducting HgBa2CuO4+δ Zachary Anderson, Yang Tang, Vikram Nagarajan, Mun Chan, Chelsey J Dorow, Guichuan Yu, Douglas L Abernathy, Andrew D Christianson, Lucile Mangin-Thro, Paul Steffens, Yvan Sidis, Philippe Bourges, Martin Greven Antiferromagnetic (AF) spin correlations are prominent across the phase diagram of the cuprate superconductors, and it has been proposed that they mediate Cooper pairing and are responsible for various pseudogap phenomena. HgBa2CuO4+δ (Hg1201) is a simple-tetragonal compound with a single CuO2 plane per unit cell and the highest optimal Tc among single-layer cuprates, and thus a model system for the study of the AF response of the quintessential CuO2 planes. Our previous work has shown that the AF excitations in moderately to optimally-doped Hg1201 are distinctly different from what had been observed in other cuprates; namely, the low-energy response is commensurate and gapped, resulting in a 'Y'-shaped, rather than 'X'-shaped dispersion. Here we present our recent inelastic neutron scattering measurements of the AF excitations in heavily underdoped Hg1201. |
Monday, March 4, 2019 3:30PM - 3:42PM |
C08.00006: Tracing the origin of charge density waves in cuprates Fryderyk Lyzwa, Milan Orlita, Bing Xu, Christian Bernhard Since the discovery of the so-called pseudogap phenomenon in the 1990’s, the origin of the state properties of the underdoped cuprate high TC superconductors have been intensively studied [1]. An important step towards the identification of the HTSC pairing mechanism was the discovery, that a charge density wave (CDW) exists in large parts of the underdoped phase diagram [2-5]. It was shown, that in zero magnetic field (B=0) the short-ranged, static CDW is induced by defects, while a long-range CDW can be induced for high B-fields along the c-axis (perpendicular to the CuO2 layers). |
Monday, March 4, 2019 3:42PM - 3:54PM |
C08.00007: Charge density wave energy scale in superconducting cuprates Bastien Loret, Yann Gallais, Maximilien Cazayous, Anne Forget, Dorothée Colson, Marc-Henri Julien, Indranil Paul, Marcello Civelli, Alain Sacuto An outstanding challenge in high-Tc cuprates is to understand how charge density wave order is related to the pseudogap and superconducting phases [1]. To address this issue it is important to extract the energy scale ΔCDW associated with the charge modulations, and to compare it with the pseudogap (PG) ΔPG and the superconducting gap ΔSC. However, while TCDW is well-characterized from earlier works [2] little has been known about ΔCDW until now. We will report the extraction of ΔCDW for several cuprates using electronic Raman spectroscopy [3]. We observe that ΔCDW increases in a manner similar to the doping dependence of ΔPG and ΔSC. This reveals that the three phases have a common microscopic origin. In addition, we find that ΔCDW ≈ ΔSC over a substantial doping range, which suggests that CDW and superconducting phases are intimately related, for example intertwined or connected by an emergent symmetry [1, 4-6]. |
Monday, March 4, 2019 3:54PM - 4:06PM |
C08.00008: Large negative thermal Hall response in the pseudogap phase of cuprates Gael Grissonnanche, Anaelle Legros, Sven Badoux, Étienne Lefrancois, Victor Zatko, Maude le Lizaire, Francis Laliberte, Adrien Gourgout, Jianshi Zhou, Sunseng Pyon, Tomohiro Takayama, Hidenori Takagi, Shimpei Ono, Nicolas Doiron-Leyraud, Louis Taillefer The nature of the pseudogap phase of cuprate superconductors remains a mystery. In that phase, the Fermi surface is transformed even though translational symmetry is not broken [1]. A possible explanation is a spin-liquid-like state with topological order [2]. |
Monday, March 4, 2019 4:06PM - 4:18PM |
C08.00009: Pressure induced suppression of the Pseudogap in the cuprate superconductor Nd-LSCO probed by thermoelectric measurements Adrien Gourgout, Amirreza Ataei, Marie-Eve Boulanger, Sven Badoux, David E Graf, Jianshi Zhou, Nicolas Doiron-Leyraud, Louis Taillefer In cuprate superconductors, one of the most mysterious phase is the Pseudogap (PG). It seems linked to the superconducting dome, but the nature of their connection remains unknown. It onsets at a doping p* and is characterized by a drop in carrier density n from n=1+p above p* to n=p below. In resistivity and Hall effect, an upturn is seen at low temperature in both quantities[1]. In Nd0.4La1.6-xSrxCuO4 (Nd-LSCO), at ambient pressure, p*=0.23. A recent study from our group showed that by applying hydrostatic pressure, one can suppress the PG in Nd-LSCO and move p* to a lower doping[2]. At p=0.22, the upturns in resitivity and Hall effect are fully suppressed with 2GPa. The underlying mechanism for this effect is rooted in the Fermi Surface (FS), which imposes that the PG cannot open on an electron-like FS. Here we present a confirmation of these results, by means of Seebeck and Nernst effect measurements under pressure up to 2GPa and in magnetic fields up to 31.2T. In both quantities, the increase due to the PG is strongly suppressed by pressure at p=0.22, but shows only a weak effect at p=0.24, which further supports our interpretation that pressure tunes the pseudogap critical point p* to lower dopings in Nd-LSCO. |
Monday, March 4, 2019 4:18PM - 4:30PM |
C08.00010: Interwined orders in the ground state of the Emery model in the underdoped regime Ettore Vitali, Shiwei Zhang, Adam C Chiciak We perform extensive Auxiliary-Field Quantum Monte Carlo (AFQMC) calculations for the three-band Hubbard (Emery) model in the underdoped regime, in order to study the ground-state properties of Copper-Oxygen planes in the cuprates. Interfacing generalized Hartree-Fock calculations with cutting-edge AFQMC techniques, we are able to resolve small energy scales, which is crucial for determining the complex candidate orders in such a system. We will present results as a function of hole-doping and charge-transfer energy. |
Monday, March 4, 2019 4:30PM - 4:42PM |
C08.00011: Coexistence of Superconductivity and Antiferromagnetism in the Hubbard model for cuprates Alexandre Foley, Simon Verret, Andre-Marie Tremblay, David Senechal Antiferromagnetism and d-wave superconductivity are the most important competing ground-state phases of cuprate superconductors. |
Monday, March 4, 2019 4:42PM - 4:54PM |
C08.00012: Superconducting phase fluctuations and gap-filling phenomenology in the underdoped cuprates Miguel Antonio Sulangi, Jan Zaanen We revisit the role of superconducting phase fluctuations in the cuprates as probed by various spectroscopic methods. We assume that the fluctuations of the phase of the d-wave superconducting order parameter are governed solely by a two-dimensional classical XY model and that no amplitude fluctuations are present. We find that much of the "filling-of-the-gap" phenomenology seen in the cuprates is captured by this simple model. At temperatures below the Kosterlitz-Thouless transition, the system behaves as a spatially uniform d-wave superconductor whose gap is proportional to the modulus of the spatial average of the order parameter. Above the KT transition, the vortex-dominated phase exhibits behavior that becomes more normal-like with increasing temperature. Fermi arcs in the spectral function are present near the KT transition. We also examine the effect of spatial inhomogeneity in the classical XY model and consider how the coexistence of superconducting and pseudogap-like regions seen in the cuprates can be reproduced using this model. |
Monday, March 4, 2019 4:54PM - 5:06PM |
C08.00013: Ultrasonic study of La-based high-Tc superconductor under high magnetic field Mehdi Frachet, David LeBoeuf, Siham Benhabib, cyril proust, jérôme debray, Baptiste Vignolle, Tohru Kurosawa, Naoki Momono Lanthanum based cuprate superconductors are highly correlated electrons systems well-know for their structural, magnetic, charge and superconducting instabilities. In underdoped compound (i.e. for doping less than optimal for superconductivity) a dip in the onset temperature for superconductivity Tc, centered at p∼0.125, occurs. While the origin of this dip is still under debate, most of the experimental evidence in La2-xSrxCuO4 (LSCO) seems to point toward a competition with frozen magnetism1. |
Monday, March 4, 2019 5:06PM - 5:18PM |
C08.00014: Electroplated Rhenium - A new high-enough Tc material8 David Pappas, Russell Lake, Mustafa Bal, Corey Rae McRae, Ronald B Goldfarb, Donald David, Junling Long, Britton L Plourde, Eunja Kim, Dustin A Hite, Lee Pappas, Ilke Arslan, Xian Wu, qiang huang, Hsiang-Sheng Ku, Alexana Roshko, Jianguo Wen We show that Re films, which normally have Tc in the range of 1.8-3 K, have a superconducting critical temperature of approximately 6 K when electroplated from aqueous solutions. Since these solutions are compatible with standard manufacturing processes and and Re is insoluble with many noble metals, this allows for integration of superconducting Re cores into, e.g., Au, Cu, and Ni multilayers. These superconducting multilayers can be usend a wide range of standard components for 4 K and below electronics, connectorized using either soldering or wirebonding. We find that potassium-based solutions result in films with high hydrogen content that evidence of stress above 150 nm thickness, while the Li-based solutions result in films stable to at least 600 nm. Magnetic response as a function of field at 1.8 K demonstrates type-II superconductivity, with an upper critical field of 2.5 T. Critical current densities on the order of 108 A/m2, comparable to Nb, were measured at liquid-helium temperature. Low-loss at RF was obtained for films on resonators made with Cu traces on commercial circuit boards. The relation between superconductivity and nano-structure will be investigated using x-ray diffraction and transmission electron microscopy. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700