Pseudogap Ground State and Its Doping Evolution in Bi2Sr2-xLaxCuO6+δ: Removing the Superconducting State by the Application of Very High Magnetic Fields
Pseudogap Ground State and Its Doping Evolution in Bi2Sr2-xLaxCuO6+δ: Removing the Superconducting State by the Application of Very High Magnetic Fields
复制标题
Bi2Sr2-xLaxCuO6+δ 中的赝能隙基态及其掺杂演化：通过施加极高磁场去除超导态
DOI：
10.1007/s10948-012-1575-4
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
G.-q.Zheng
中科院分区：
文献类型：
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作者：
W. -T. Chen;T. Saito;M. Mizumaki;and Y. Shimakawa;G.-q.Zheng
我们提出的赝能隙基态及其掺杂的演变在单层铜氧化物BiSrLaCuO的结果。我们施加非常高的磁场高达44 T，以消除超导状态，并揭示隐藏的低温（T）正常状态。通过Cu-NMR Knight位移和自旋-晶格弛豫速率的测量，我们发现当超导性被去除后，零T极限下的费米能级上仍然存在有限的态密度，这表明赝能隙基态是费米面体积有限的金属态.赝能隙基态中的剩余DOS随着掺杂的减少（增加x）而减少，但即使在x≥ 0.8的磁有序相附近也保持相当大。结果表明，超导电性是从剩余费米面产生的，并与赝能隙共存。
We present results for the pseudogap ground state and its doping evolution in single-layered copper-oxide BiSrLaCuO. We apply very high magnetic fields up to 44 T to remove the superconducting state and reveal the hidden low temperature (T) normal state. Through Cu-NMR Knight shift and spin-lattice relaxation rate measurements, we find that there remains a finite density of states (DOS) at the Fermi level in the zero-T limit when the superconductivity is removed, which indicates that the pseudogap ground state is a metallic state with a finite volume of Fermi surface. The residual DOS in the pseudogap ground state decreases with decreasing doping (increasing x), but remains quite large even at the vicinity of the magnetically ordered phase of x≥ 0.8. The result indicates that the superconductivity emerges from the remaining Fermi surface and coexists with the pseudogap.