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Coherent quasiparticle weight and its connection to high-T_c superconductivity from angle-resolved photoemission | | H. Ding
; J.R. Engelbrecht
; Z. Wang
; J. C. Campuzano
; S.-C. Wang
; H.-B. Yang
; R. Rogan
; T. Takahashi
; K. Kadowaki
; D. G. Hinks
; | | Date: |
8 Jun 2000 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Affiliation: | 2 and 3), S.-C. Wang , H.-B. Yang , R. Rogan , T. Takahashi , K. Kadowaki , D. G. Hinks ( Boston College, Univ. of Illinois at Chicago, Argonne National Lab, Tohoku Univ., Univ. of Tsukuba | | Abstract: | In conventional superconductors, the pairing energy gap (Delta) and superconducting phase coherence go hand-in-hand. As the temperature is lowered, both the energy gap and phase coherence appear at the transition temperature T_c. In contrast, in underdoped high-T_c superconductors (HTSCs), a pseudogap appears at a much higher temperature T^*, smoothly evolving into the superconducting gap at T_c. Phase coherence on the other hand is only established at T_c, signaled by the appearance of a sharp quasiparticle (QP) peak in the excitation spectrum. Another important difference between the two types of superconductors is in the ratio of 2Delta / T_c=R. In BCS theory, R~3.5, is constant. In the HTSCs this ratio varies widely, continuing to increase in the underdoped region, where the gap increases while T_c decreases. Here we report that in HTSCs it is the ratio z_ADelta_m/T_c which is approximately constant, where Delta_m is the maximum value of the d-wave gap, and z_A is the weight of the coherent excitations in the spectral function. This is highly unusual, since in nearly all phase transitions, T_c is determined by an energy scale alone. We further show that in the low-temperature limit, z_{it A} increases monotonically with increasing doping x. The growth is linear, i.e. z_A(x)propto x, in the underdoped to optimally doped regimes, and slows down in overdoped samples. The reduction of z_A with increasing temperature resembles that of the c-axis superfluid density. | | Source: | arXiv, cond-mat/0006143 | | Services: | Forum | Review | PDF | Favorites | |
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