Eur. Phys. J. B 35, 103-110 (2003)
https://doi.org/10.1140/epjb/e2003-00260-x

The "quasiparticle" peak in the angular resolved spectrum of the superconducting underdoped Bi₂Sr₂CaCu₂O₈

Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA

Corresponding author: ^a rozhkov@physics.rutgers.edu

Received: 13 September 2002
Revised: 25 December 2002
Published online: 22 September 2003

Abstract

We study the reconfiguration of the angular resolved photoemission spectrum near M point which occurs in Bi₂Sr₂CaCu₂O₈ upon cooling below the superconducting transition temperature. Restricting our attention to the case of underdoped samples we offer a phenomenological mechanism-independent explanation for this effect. It is demonstrated that under certain circumstances the emergence of a peak can be linked to the normal state pseudogap. All of the basic experimental observations, including weak peak dispersion, "dip-and-hump" shape of the superconducting state spectrum and appearance of the peak at the temperatures somewhat higher than the critical temperature, are naturally explained.