Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y30: Copper Oxide Superconductors: Transport |
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Sponsoring Units: DCMP Chair: Timir Datta, Univ of South Carolina Room: LACC 406B |
Friday, March 9, 2018 11:15AM - 11:27AM |
Y30.00001: Quantum oscillations and superconductivity in the cuprate high Tc's Suchitra Sebastian, Neil Harrison, Yu-Te Hsu, Mate Hartstein, Alexander Davies, Juan Porras, Toshinao Loew, Matthieu le Tacon, Bernhard Keimer, Mun Chan, Sofia Taylor, Hsu Liu, Gilbert Lonzarich, Huakun Zuo, Jinhua Wang, Zengwei Zhu I will discuss measurements of quantum oscillations and electrical transport in the cuprate high temperature superconductors to explore the high magnetic field state in these materials. |
Friday, March 9, 2018 11:27AM - 11:39AM |
Y30.00002: Nernst effect in the electron-doped cuprate superconductor La2-xCexCuO4 Pampa Mandal Sarkar, Tarapada Sarkar, Joshua Higgins, Richard Greene We report a systematic study of the Nernst effect in films of the electron doped cuprate superconductor La2-xCexCuO4 (LCCO) as a function of temperature and magnetic field (up to 14 T) over a range of doping from underdoped (x = 0.08) to overdoped (x = 0.16). We have determined the characteristic field scale HC2* of superconducting fluctuation, which is found to track the domelike dependence of superconductivity (TC). In addition, we also report the temperature onset, Tonset, of superconducting fluctuations above TC. We find that for optimally doped x=0.11 the Tonset is ~ 39 K while TC is ~ 26 K. For higher doping, the Tonset follows the superconducting dome. |
Friday, March 9, 2018 11:39AM - 11:51AM |
Y30.00003: Cuprate diamagnetism in the presence of a pseudogap: Beyond the standard fluctuation formalism Rufus Boyack, Qijin Chen, Andrey Varlamov, Kathryn Levin It is often claimed that among the strongest evidence for preformed-pair physics in the cuprates are the experimentally observed large values for the diamagnetic susceptibility and Nernst coefficient. These findings are most apparent in the underdoped regime, where a pseudogap is also evident. While the conventional (Gaussian) fluctuation picture has been applied to address these results, this preformed-pair approach omits the crucial effects of a pseudogap. We remedy this omission by computing the diamagnetic susceptibility and Nernst coefficient in the presence of a normal state gap. We find a large diamagnetic response for a range of temperatures much higher than the transition temperature. In particular, we report semi-quantitative agreement with the measured diamagnetic susceptibility onset temperatures, over the entire range of hole dopings. Notable is the fact that at the lower critical doping of the superconducting dome, the onset temperature for both diamagnetic and transverse thermoelectric transport coefficients tends to zero. Due to the importance attributed to the cuprate diamagnetic susceptibility and Nernst coefficient, this work helps to clarify the extent to which pairing fluctuations are a component of the cuprate pseudogap. |
Friday, March 9, 2018 11:51AM - 12:03PM |
Y30.00004: Hall Effect in Hole-doped Cuprates: Pairing Fluctuations Versus Fermi Surface Reconstruction Xiaoyu Wang, Qijin Chen, Rufus Boyack, Kathryn Levin In this talk we address a theory for Hall coefficient R_H measurements in hole-doped cuprates at variable doping and temperature. For some time these experiments, and particularly the sign change near Tc, were argued to support a preformed pair interpretation of the pseudogap. For the most part this body of theoretical work has been based on a weak pairing fluctuation picture. More recently an alternative Fermi-liquid-like viewpoint has come into favor in which R_H is argued to provide information about the number density and character of the effective charge carriers. Our work seeks to shed light on this controversy. We address what is missing in previous calculations of R_H |
Friday, March 9, 2018 12:03PM - 12:15PM |
Y30.00005: High-field Behavior in the Electron Doped Superconducting Cuprate La2-xCexCuO4 Joshua Higgins, Tarapada Sarkar, Mun Chan, Ross McDonald, Richard Greene, Nicholas Butch We present recent results on the magnetoresistance and Hall effect of La2-xCexCuO4 (LCCO) in applied fields up to 65 T in the vicinity of the proposed quantum critical point at xc = 0.141. Additionally, at xc, the T -> 0 K Hall coefficient changes sign in low magnetic fields (B < 14 T) from negative below xc to positive for higher dopings. It was recently reported in Nd2-xCexCuO4 single crystals2 that the doping where the sign change occurs shifts to lower doping at higher fields. We revisit this trend in LCCO thin films and discuss the possible scenarios. |
Friday, March 9, 2018 12:15PM - 12:27PM |
Y30.00006: Impact of spin-density-wave order on thermal transport in the cuprate superconductor LSCO Patrick Bourgeois-Hope, Shiyan Li, Nicolas Doiron-Leyraud, Louis Taillefer, Thomas Croft, Christopher Lester, Stephen Hayden, Hidenori Takagi, Kazuyoshi Yamada, Naoki Momono, Tohru Kurosawa We report low temperature thermal conductivity measurements in the cuprate superconductor LSCO for samples with a doping x between 0.125 and 0.15. In this doping range, spin-density-wave order coexisting with superconductivity can be induced by applying a magnetic field [1,2]. We study the impact of this order on the conduction of d-wave quasiparticles by measuring the residual thermal conductivity κ0/T in the T → 0 limit, as a function of doping and magnetic field. |
Friday, March 9, 2018 12:27PM - 12:39PM |
Y30.00007: Pressure Effects Show that the Pseudogap Phase of Cuprates is Confined by Fermi Surface Topology Nicolas Doiron-Leyraud, O. Cyr-Choinière, Sven Badoux, Amirreza Ataei, Clement Collignon, Adrien Gourgout, Sophie Dufour-Beauséjour, Fazel Tafti, Francis Laliberté, Marie-Eve Boulanger, Marcin Matusiak, Louis Taillefer, David Graf, Minjae Kim, Jianshi Zhou, Hidenori Takagi The pseudogap phase is the central puzzle of cuprate high-temperature superconductors, and why it onsets below a critical doping p* that is much lower in La2−xSrxCuO4 than in La1.6−xNdySrxCuO4 or Bi2Sr2CuO6+δ, for instance, is unknown. We recently performed high-magnetic-field transport measurements in the cuprate La1.6−xNdySrxCuO4 and observed a large and unexpected shift of the pseudogap critical point p* as a function of applied pressure. We find that the shift in p* is driven by a corresponding shift in pFS, the doping at which the large Fermi surface goes from hole-like to electron-like, so that p* ≤ pFS must be obeyed. Consequently, the pseudogap cannot open on an electron-like Fermi surface. This necessary condition for pseudogap formation, imposed by details of the Fermi surface, is a strong constraint for theories of the pseudogap phase. Our finding that p* can be tuned with a modest pressure opens a new route for experimental studies of the pseudogap. |
Friday, March 9, 2018 12:39PM - 12:51PM |
Y30.00008: High field contactless resistivity measurements of YBa2Cu3O6+x in quasi hydrostatic pressures up to 20 GPa Sofia Taylor, Patricia Alireza, Hsu Liu, Grace Zhang, Wentin Guo, Juan Porras, Toshinao Loew, Yu-Te Hsu, Gilbert Lonzarich, Matthieu le Tacon, Bernhard Keimer, Suchitra Sebastian The high temperature copper-oxide superconductor YBa2Cu3O6+x is widely studied due to its rich phase diagram and the observation of quantum oscillations in the underdoped regime. However, the overdoped regime remains largely inaccessible by chemical doping. Recently we have used high pressures to access the full superconducting dome. I will discuss measurements in pressures up to 20 GPa in high magnetic fields to explore the evolution of superconductivity into the overdoped regime. |
Friday, March 9, 2018 12:51PM - 1:03PM |
Y30.00009: Low Temperature Terahertz Nano-spectroscopy and Imaging of an YBCO Thin Film Ran Jing, H. Stinson, Ethan Cho, Shane Cybart, Dimitri Basov We discuss the development of cryogenic scanning near-field microscope suitable for nano-scale imaging and spectroscopy in the terahertz frequency range with the spatial resolution below 130 nm. We report near-field measurement using this technology of a c-axis oriented YBa2Cu3O7 thin film above and below the superconducting transition temperature. Contrast in the near-field signal can be observed between the superconducting and normal state. We will discuss the spatial and temperature dependence of the terahertz near-field signal and spectra. |
Friday, March 9, 2018 1:03PM - 1:15PM |
Y30.00010: Thermal Hall effect in cuprate superconductors Gael Grissonnanche, Anaëlle Legros, Victor Zatko, Sven Badoux, Etienne Lefrancois, Francis Laliberté, Jianshi Zhou, Nicolas Doiron-Leyraud, Louis Taillefer We report measurements of the thermal Hall conductivity κxy in cuprate superconductors, in magnetic fields large enough to supress superconductivity. |
Friday, March 9, 2018 1:15PM - 1:27PM |
Y30.00011: Investigating the pseudogap critical point of the cuprate superconductor Bi2201 Maude Lizaire, Anaëlle Legros, Clement Collignon, Adrien Gourgout, Sven Badoux, Francis Laliberté, Nicolas Doiron-Leyraud, Louis Taillefer, Shimpei Ono Recent measurements of the resistivity and Hall coefficient in cuprates at high magnetic fields have revealed a new signature of the critical point p* where the pseudogap phase ends at T=0 in the absence of superconductivity: the carrier density drops abruptly from n = 1+p above p* to n = p below p* [1,2,3]. |
Friday, March 9, 2018 1:27PM - 1:39PM |
Y30.00012: Hall Effect in Bi2Sr2CaCu2O8+x van der Waals Heterostructures Down to Two Unit Cells Shu Yang Frank Zhao, Nicola Poccia, Hyobin Yoo, Jedediah Johnson, Margaret Panetta, Cyndia Yu, Young-Jae Shin, Ruidan Zhong, Genda Gu, Kenji Watanabe, Takashi Taniguchi, Philip Kim We explore the electronic transport properties of atomically-thin, mechanically exfoliated, optimally doped Bi2Sr2CaCu2O8+x (BSCCO). We have fabricated superconducting devices with bulk-like superconducting transition behavior down to 1.5 unit cells thickness. In order to avoid degradation of our crystals, the devices are made entirely inside an argon glovebox using a high-resolution stencil mask evaporation method without any exposure to air, resist, solvent, or heat, and with a lateral resolution < 500 nm. The crystals are subsequently protected by hexagonal boron nitride crystal, stacked atop the BSCCO at room temperature in argon. We measure the Hall effect down to two unit cells, which shows a saturation of Hall coefficient at 13T and 75K to the normal state value, and double-sign-reversal in the Hall coefficient (the Hall anomaly) at low fields near Tc. We compare this data to bulk samples. The incorporation of BSCCO into van der Waals heterostructures opens the possibility of a new generation of mesoscopic devices for the study of high temperature superconductivity and their interplay with other van der Waals crystal systems. |
Friday, March 9, 2018 1:39PM - 1:51PM |
Y30.00013: Transport and Mechanical Properties of (Bi,Pb)-2223 Doped by PbF2 Aly Abou-Aly, M Anas, A Abbady This study examines the influence of PbF2 addition on the electrical and the mechanical properties of Bi1.8Pb0.4Sr2Ca2.1Cu3.2O10+δ superconducting phase. Samples of nominal composition Bi1.8Pb0.4Sr2Ca2.1Cu3.2O10+δ-xFx were prepared using solid-state reaction technique. The fluorine content x varied from 0.00 to 0.30 by step 0.05. The prepared samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The XRD investigation indicated that the fluorine enhanced the (Bi,Pb)-2223 phase formation up to x = 0.10. On the other hand, the high concentrations of fluorine retarded the phase formation. Granular investigation, by SEM, showed the grain size increased as x increased from x = 0.05 to 0.20 with more grain's orientation and inter-coupling between superconducting grains. The electrical resistivity measurements indicated that superconducting transition temperatures reached 114K for x up to 0.10. Additionally the transport critical current density at 77K and zero magnetic field have been reached ~700 A/cm2, then suppressed for higher contents. Moreover, the samples exhibited higher Vickers micro-hardness at x = 0.10. The results were attributed to the role of partial replacement of Oxygen by fluorine in (Bi,Pb)-2223 superconducting phase. |
Friday, March 9, 2018 1:51PM - 2:03PM |
Y30.00014: Anomalous behaviors of elastoresistivity associated with the pseudogap state in cuprates Tao Xie, Shiliang Li Many results have suggested that the rotational symmetry is broken in the pseudogap state in cuprates. This type of symmetry breaking has been found in iron-based superconductors and is believed to be associated with the nematic order. Therefore, it will be very interesting to see if the nematic order presents in cuprates. In this work, we studied the elastoresistivity of hole-doped cuprates by the way similar to that for iron-based superconductors. The elastoresistivity along particular crystalline direction shows behaviors similar to those in iron-based superconductors. However, they are significantly affected by the crystal structures and disorders, which casts doubt on the existence of nematic order in cuprates. |
Friday, March 9, 2018 2:03PM - 2:15PM |
Y30.00015: Transverse Transport, Optical Response and Two Relaxation Rates of $t-J$ Model in $\infty$ Dimensions Wenxin Ding, Rok Zitko, Sriram Shastry Using two approaches to strongly correlated systems, the extremely correlated Fermi liquid theory and the dynamical mean field |
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