Vertical temperature boundary of the pseudogap under the superconducting dome in the phase diagram of Bi2Sr2CaCu2O8+δ
Vertical temperature boundary of the pseudogap under the superconducting dome in the phase diagram of Bi2Sr2CaCu2O8+δ
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DOI：
10.1103/physrevb.96.094525
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发表时间：
2017-09-25
影响因子：
3.7
通讯作者：
Sacuto, A.
中科院分区：
文献类型：
--
作者：
Loret, B.;Sakai, S.;Sacuto, A.
结合电子喇曼散射实验和胞体动力学平均场理论，我们给出了各种空穴掺杂的铜酸盐在超导态下存在赝隙的证据。在Bi2Sr2CaCu2O8+增量中，我们跟踪了超导伪隙特征，这是一种峰谷特征，作为温度T和掺杂p的函数，远远超出了最佳特征。我们发现，在超导穹顶下的所有温度下，在掺杂p(C)为0.222到0.226之间时，赝隙消失，同时正常态赝隙也在Lifshitz相变处坍塌。这说明超导伪隙边界在T-p相图中形成一条垂直线。
Combining electronic Raman scattering experiments with cellular dynamical mean field theory, we present evidence of the pseudogap in the superconducting state of various hole-doped cuprates. In Bi2Sr2CaCu2O8+delta we track the superconducting pseudogap hallmark, a peak-dip feature, as a function of temperature T and doping p, well beyond the optimal one. We show that, at all temperatures under the superconducting dome, the pseudogap disappears at the doping p(c), between 0.222 and 0.226, where also the normal-state pseudogap collapses at a Lifshitz transition. This demonstrates that the superconducting pseudogap boundary forms a vertical line in the T-p phase diagram.