Two-Fermi-surface superconducting state and a nodal d-wave energy gap of the electron-doped Sm1.85Ce0.15CuO(4-δ) cuprate superconductor.
Two-Fermi-surface superconducting state and a nodal d-wave energy gap of the electron-doped Sm1.85Ce0.15CuO(4-δ) cuprate superconductor.
复制标题
电子掺杂Sm1.85Ce0.15CuO(4-δ)铜酸盐超导体的双费米面超导态和节点d波能隙。
DOI：
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发表时间：
2011
影响因子：
8.6
通讯作者：
N. Bontemps
中科院分区：
文献类型：
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作者：
A. Santander;M. Ikeda;T. Yoshida;A. Fujimori;K. Ishizaka;M. Okawa;S. Shin;B. Liang;A. Zimmers;R. L. Greene;N. Bontemps
本文报道了电子掺杂铜酸盐Sm_（1.85）Ce_（0.15）CuO（4-δ）的激光激发角分辨光电子能谱。结果表明，在正常态和超导态下都存在节孔-口袋费米面。通过对主带和折叠带相干因子的分析，证明了它的起源是长程反铁磁性。这种长程反铁磁性和超导性的共存意味着电子掺杂的铜氧化物是双费米面超导体。在节孔口袋中测量的超导间隙是兼容的d波对称性。
We report on laser-excited angle-resolved photoemission spectroscopy in the electron-doped cuprate Sm1.85Ce0.15CuO(4-δ). The data show the existence of a nodal hole-pocket Fermi surface both in the normal and superconducting states. We prove that its origin is long-range antiferromagnetism by an analysis of the coherence factors in the main and folded bands. This coexistence of long-range antiferrmagnetism and superconductivity implies that electron-doped cuprates are two-Fermi-surface superconductors. The measured superconducting gap in the nodal hole pocket is compatible with a d-wave symmetry.