Armitage N P, Lu D H, Kim C, Damascelli A, Shen K M, Ronning F, Feng D L, Bogdanov P, Shen Z X, Onose Y, Taguchi Y, Tokura Y, Mang P K, Kaneko N, Greven M
Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA.
Phys Rev Lett. 2001 Oct 1;87(14):147003. doi: 10.1103/PhysRevLett.87.147003. Epub 2001 Sep 18.
We report a high-resolution angle-resolved photoemission spectroscopic study of the electron-doped ( n-type) cuprate superconductor Nd1.85Ce0.15CuO4. We observe regions along the Fermi surface where the near- E(F) intensity is suppressed and the spectral features are broad in a manner reminiscent of the high-energy "pseudogap" in the underdoped p-type (hole doped) cuprates. However, instead of occurring near the (pi,0) region, as in the p-type materials, this pseudogap falls near the intersection of the underlying Fermi surface with the antiferromagnetic Brillouin zone boundary.
我们报道了对电子掺杂（n型）铜酸盐超导体Nd1.85Ce0.15CuO4进行的高分辨率角分辨光电子能谱研究。我们观察到费米面上存在一些区域，其中近费米能（E(F)）强度受到抑制，并且光谱特征展宽，其方式让人联想到欠掺杂p型（空穴掺杂）铜酸盐中的高能“赝能隙”。然而，与p型材料不同，这种赝能隙并非出现在(π,0)区域附近，而是出现在潜在费米面与反铁磁布里渊区边界的交点附近。
