Phys. Rev. Lett. 72, 1526–1529 (1994)Midgap surface states as a novel signature for dxa2-xb2-wave superconductivityReceived 27 July 1993; published in the issue dated 7 March 1994 It is shown that a sizable areal density of midgap states exists on a {110} surface of a dxa2-xb2-wave superconductor, which can either have vacuum or an insulator at the surface, or be separated from vacuum or an insulator by a clean, size-quantized, normal metal overlayer. These ‘‘midgap’’ states have many observable consequences—some of which are briefly discussed here—which can be used as a clear signature to distinguish between d-wave and anisotropic s-wave superconductors. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.72.1526
DOI:
10.1103/PhysRevLett.72.1526
PACS:
74.20.Mn, 74.25.Ha, 74.25.Jb, 74.80.-g
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