Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session H44: Demise of Superconductivity in Overdoped CupratesInvited
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Sponsoring Units: DCMP Room: BCEC 210C |
Tuesday, March 5, 2019 2:30PM - 3:06PM |
H44.00001: Starfish-shaped Cooper pairs with ultrashort antinodal length scales across all doping levels in cuprate superconductors. Invited Speaker: Daniel Dessau We access the fully causal electronic self-energy utilizing a brand new 2-dimensional method of ARPES analysis [1], which removes the critical limitations of the previous one-dimensional MDC (Momentum Distribution Curve) and EDC (Energy Distribution Curve) methods. This new method, which utilizes orders-of-magnitude fewer parameters than the MDC and EDC methods, brings in the energy, momentum, and temperature -dependence of the self energies and is fully consistent with the already-successful studies showing the gap filling-in behavior [2,3]. The full set of parameters we access allows us to make the first direct measurements of the shape and size of the pairs [4]. This is all critical information for explaining how coherence between the pairs (the superconducting state) evolves as a function of doping and temperature. |
Tuesday, March 5, 2019 3:06PM - 3:42PM |
H44.00002: What Makes Cuprate Superconductors so Exceptional? Invited Speaker: Ivan Bozovic A comprehensive experiment will be decsribed in which over 2,000 single-crystal LSCO films were grown by molecular beam epitaxy and studied for 12 years. Resistivity, RH, magnetoresistance, Tc, penetration depth, and coherence length have been measured precisely as a function of temperature T (down to 300 mK), magnetic field B (up to 90 T), doping, and in-plane azimuth angle. [1-3] |
Tuesday, March 5, 2019 3:42PM - 4:18PM |
H44.00003: Density wave as a probe of the full cuprate phase diagram Invited Speaker: Jennifer Hoffman In cuprate materials, the strong correlations in proximity to the antiferromagnetic Mott insulating state give rise to an array of unconventional phenomena beyond high temperature superconductivity. Developing a complete description of the ground state evolution is crucial to decoding the complex phase diagram. Here we use the structure of broken translational symmetry, namely d-form factor charge modulations in (Bi,Pb)2(Sr,La)2CuO6+δ, as a probe of the ground state reorganization which occurs at the transition from truncated Fermi arcs to a large Fermi surface. We use real space imaging of local electronic inhomogeneity as a tool to access a range of dopings within each sample, and we firmly establish the spectral gap Δ as a proxy for local hole doping. From the Δ-dependence of the charge modulation wavevector, we discover a commensurate to incommensurate transition that is coincident with the Fermi surface transition from arcs to large hole pocket, demonstrating the qualitatively distinct nature of the electronic correlations governing the two sides of this quantum phase transition. Furthermore, the doping dependence of the incommensurate wavevector on the overdoped side is at odds with a simple Fermi surface driven instability. |
Tuesday, March 5, 2019 4:18PM - 4:54PM |
H44.00004: Insights from specific heat of overdoped cuprates Invited Speaker: James Storey Overdoped cuprates are often touted as exhibiting more or less “conventional Fermi-liquid-like behaviour” in the normal state. Yet as Tc goes to zero in heavily overdoped cuprates, unconventional behaviour is still observed in several superconducting state properties. For example, the low-temperature electronic specific heat develops an increasingly large residual component and the height of the anomaly at Tc decreases. This is accompanied by an unexpected scaling of the zero-temperature superfluid density with Tc, which should be constant within a conventional BCS picture. By considering lifetime effects I show that these observations can be explained by temperature-dependent scattering in the presence of a d-wave energy gap, and a decreasing pairing interaction strength with doping. |
Tuesday, March 5, 2019 4:54PM - 5:30PM |
H44.00005: Dynes superconductivity and the cuprates Invited Speaker: Richard Hlubina
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