Tuesday, June 18, 2013

1306.3731 (Seung Hwan Hong et al.)

Low energy kink induced by off-plane impurities in BSCCO superconductors    [PDF]

Seung Hwan Hong, Jin Mo Bok, Han-Yong Choi, Wentao Zhang, Junfeng He, X. J. Zhou
Features of the low energy "kink" (LEK) seen below ~10 meV in BSCCO are: (a) the kink energy is proportional to Tc, and (b) smaller than the gap size, and (c) strength of LEK is sharply enhanced below Tc. We propose that all these observations can naturally be understood in terms of the forward scattering impurities located off the CuO2 planes. This is substantiated by combining the Eliashberg calculations including the forward scattering impurities and analysis of laser based ARPES intensity from Bi2Sr2CaCu2O8+{\delta}. The calculated impurity self-energy is shown to account satisfactorily for the experimental self-energy in the low energy region as the tilt angle or temperature is varied. This, as a consequence, opens up a prospect that the intrinsic boson spectrum can be uncovered by the impurity removed ARPES analysis.
View original: http://arxiv.org/abs/1306.3731

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