Quasiparticles in the superconducting state of Bi2Sr2CaCu2O8
A. Kaminski, J. Mesot, H. Fretwell, J. C. Campuzano, M. R. Norman, M., Randeria, H. Ding, T. Sato, T. Takahashi, T. Mochiku, K. Kadowaki, H. Hoechst
TL;DR
This paper reports high-resolution ARPES measurements on Bi2Sr2CaCu2O8, revealing true quasiparticles at the Fermi momentum in the superconducting state and providing insights into the electronic structure relevant for charge transport.
Contribution
It presents new ARPES data with enhanced momentum resolution, showing intrinsic quasiparticle lineshapes in the superconducting state of Bi2212.
Findings
Intrinsic quasiparticle lineshape observed in superconducting state
Quasiparticles absent in the normal state
Results relevant for understanding charge transport
Abstract
Recent improvements in momentum resolution by a factor of 32 lead to qualitatively new ARPES results on the spectra of Bi2Sr2CaCu2O8 (Bi2212) along the (pi,pi) direction, where there is a node in the superconducting gap. With improved resolution, we now see the intrinsic lineshape, which indicates the presence of true quasiparticles at the Fermi momentum in the superconducting state, and lack thereof in the normal state. The region of momentum space probed here is relevant for charge transport, motivating a comparison of our results to conductivity measurements by infrared reflectivity.
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