Anomalous peak in the superconducting condensate density of cuprate high-Tc superconductors at a unique doping state

被引:118
作者
Bernhard, C
Tallon, JL
Blasius, T
Golnik, A
Niedermayer, C
机构
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Ind Res Ltd, Lower Hutt, New Zealand
[3] Univ Konstanz, Fak Phys, D-78434 Constance, Germany
[4] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland
关键词
D O I
10.1103/PhysRevLett.86.1614
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The doping dependence of the ratio of the superconducting condensate density to the effective mass, n(s)(0)/m(ab)*, was studied in detail by muon-spin rotation for Y0.8Ca0.2Ba2(Cu1-2Zn2)(3)O7-delta and Tl0.5-yPb0.5+ySr2Ca1-xYxCu2O7. Our data show that n(s)(0)/m(ab)* exhibits a peak at a unique doping state in the overdoped regime. Its position coincides with the critical doping state, where the normal state pseudogap was reported to appear and to deplete the electronic density of states, This finding implies that the pseudogap primarily arises from a change in the electronic ground state rather than from thermal fluctuations.
引用
收藏
页码:1614 / 1617
页数:4
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