Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U66: Anomalous Transport in Strange MetalsInvited
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Sponsoring Units: DCMP Chair: Aavishkar Patel, University of California, Berkeley Room: Four Seasons 1 |
Thursday, March 5, 2020 2:30PM - 3:06PM |
U66.00001: Electronic nematic softening in cuprate superconductors probed by resonant ultrasound spectroscopy Invited Speaker: Paula Giraldo-Gallo Electronic-nematic order has been shown to be the driver of the structural and magnetic transitions in the |
Thursday, March 5, 2020 3:06PM - 3:42PM |
U66.00002: Strange Metal Transport in Electron-doped La2-xCexCuO4 Invited Speaker: Richard Greene I present new measurements of resistivity, Hall Effect, magnetoresistance (MR) and thermopower in the electron-doped cuprate La2-xCexCuO4 for 0.19≥ x ≥0.08 as a function of temperature and magnetic field. The surprising results are: |
Thursday, March 5, 2020 3:42PM - 4:18PM |
U66.00003: What determines the Hall and Thermal Hall coefficients of metals, magnets and superconductors? Invited Speaker: Assa Auerbach The Hall coefficient has long been used to characterize the number and sign of charge carriers in metals and semiconductors. This assignment has only been justified in the weak disorder and interactions regimes. Unexpected Hall coefficient sign reversals (a.k.a. ``Hall anomalies’’) have been observed in strongly interacting metals, thermal Hall effect in antiferromagnets, and in the flux flow regime of cuprate superconductors. |
Thursday, March 5, 2020 4:18PM - 4:54PM |
U66.00004: Sign reversal of the flux flow Hall effect Invited Speaker: Valerii Vinokour We present a phenomenological theory of the Hall effect sign reversal in type II superconductors taking into account the normal carriers scattering and the topological contribution to Hall conductivity and show that the latter contribution leads to a double sign change of the Hall conductivity. We report an experimental observation of the double sign reversal in atomically thin BSCCO and find a quantitative agreement between the experimentally observed Hall resistance and our theoretical predictions. |
Thursday, March 5, 2020 4:54PM - 5:30PM |
U66.00005: Scale-invariant magnetoresistance in a cuprate superconductor Invited Speaker: Gregory Scott Boebinger The anomalous metallic state in the high-temperature superconducting cuprates is masked by superconductivity near a quantum critical point. Applying high magnetic fields to suppress superconductivity has enabled detailed studies of the normal state, yet the direct effect of strong magnetic fields on the metallic state is poorly understood. In this talk, we report the high-field magnetoresistance of thin-film La2–xSrxCuO4 cuprate in the vicinity of the critical doping, 0.161 ≤ p ≤ 0.190. We find that the metallic state exposed by suppressing superconductivity is characterized by magnetoresistance that is linear in magnetic fields up to 80 tesla. The magnitude of the linear-in-field resistivity mirrors the magnitude and doping evolution of the well-known linear-in-temperature resistivity that has been associated with quantum criticality in high-temperature superconductors. |
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