Armitage NP, Lu DH, Feng DL, Kim C, Damascelli A, Shen KM, Ronning F, Shen ZX, Onose Y, Taguchi Y, Tokura Y. Superconducting gap anisotropy in Nd1.85Ce0.15CuO4: results from photoemission.
PHYSICAL REVIEW LETTERS 2001;
86:1126-1129. [PMID:
11178026 DOI:
10.1103/physrevlett.86.1126]
[Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2000] [Indexed: 05/23/2023]
Abstract
We have performed angle resolved photoelectron spectroscopy on the electron doped cuprate superconductor Nd1.85Ce0.15CuO4. A comparison of the leading edge midpoints between the superconducting and normal states reveals a small, but finite shift of 1.5-2 meV near the ( pi,0) position, but no observable shift along the zone diagonal near ( pi/2, pi/2). This is interpreted as evidence for an anisotropic superconducting gap in the electron doped materials, which is consistent with the presence of d-wave superconducting order in this cuprate superconductor.
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