Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session H08: Superconductivity: Copper Oxide - Stripes, CDW and local probes
2:30 PM–5:30 PM,
Tuesday, March 5, 2019
BCEC
Room: 150
Sponsoring
Unit:
DCMP
Chair: Eric Hudson, Pennsylvania State University
Abstract: H08.00006 : Temperature and field dependence of the intrinsic tunneling structure in overdoped Bi2Sr2CaCu2O8*
3:30 PM–3:42 PM
Presenter:
Timothy Benseman
(Physics, CUNY Queens College)
Authors:
Timothy Benseman
(Physics, CUNY Queens College)
John Robert Cooper
(Cavendish Laboratory, University of Cambridge)
Geetha Balakrishnan
(Physics, University of Warwick)
Here we present intrinsic tunneling data for mesa structures fabricated on three over- and optimally-doped Bi2.15Sr1.85CaCu2O8+δ crystals, with 0.16–0.19 holes per CuO2 unit, for a wide range of temperature (T) and applied magnetic field (H). The differential conductance above the gap edge shows a clear dip structure which is highly suggestive of strong coupling to a narrow boson mode. Data below the gap edge gives clear evidence for strong T-dependent pair breaking. These findings could help theorists make a detailed Eliashberg analysis and thereby contribute towards understanding the pairing mechanism.
*The work at the University of Warwick is supported by EPSRC, UK, Grant No. EP/M028771/1, while that at Cambridge was supported by EPSRC, UK, Grant No. EP/C511778/1.
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