Two energy scales and two distinct quasiparticle dynamics in the superconducting state of underdoped cuprates

被引:288
作者
Le Tacon, M.
Sacuto, A.
Georges, A.
Kotliar, G.
Gallais, Y.
Colson, D.
Forget, A.
机构
[1] Univ Paris 07, Lab Mat & Phenomenes Quant, UMR 7162 CNRS, F-75251 Paris, France
[2] Ecole Super Phys & Chim Ind Ville Paris, Lab Phys Solide, F-75231 Paris, France
[3] Ecole Polytech, Ctr Phys Theor, F-91128 Palaiseau, France
[4] CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France
[5] CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France
[6] Columbia Univ, Dept Phys, New York, NY 10027 USA
[7] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA
[8] CEA Saclay, DSM DRECAM SPEC, Serv Phys Etat Condense, CNRS URA 2464, F-91191 Gif Sur Yvette, France
关键词
D O I
10.1038/nphys362
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The superconducting temperature T-c of hole-doped high-temperature superconductors has a dome-like shape as a function of hole concentration, with a maximum T-c at 'optimal' doping. On the underdoped side, the superconducting state is often described in terms of one energy scale, associated with the maximum of the d-wave gap (at the antinodes), which increases as the doping decreases. Here, we report electronic Raman scattering experiments that show a second energy scale in the gap function: the slope of the gap at the nodes, which decreases with decreasing doping. Our measurements also reveal two distinct quasiparticle dynamics; electronic coherence persists down to low doping levels at the nodes, whereas antinodal quasiparticles become incoherent. Using a sum-rule, we find that the low-frequency Raman response and the temperature dependence of the superfluid density, both controlled by nodal excitations, behave in a qualitatively similar manner with doping variation.
引用
收藏
页码:537 / 543
页数:7
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