Gaplessness and properties of layered superconductors: Application to high-Tc cuprates

Vladimir Z. Kresin; Stuart A. Wolf

doi:10.1103/PhysRevB.51.1229

← Back to search

Gaplessness and properties of layered superconductors: Application to high-Tc cuprates

Vladimir Z. Kresin, Stuart A. Wolf

DOI 10.1103/PhysRevB.51.1229 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

The presence of different low-dimensional structural units along with a short coherence length leads to the formation of a two-gap spectrum, that is to a double-peak structure in the superconducting density of states (e.g., Y-Ba-Cu-O). The presence of magnetic impurities leads to a gapless state. As opposed to the usual one-gap isotropic model, the region of gaplessness is extended, so that one can observe the effect of gaplessness without a noticeable shift in Tc. Strong anisotropy of the pairing interaction within the planes of a layered superconductor also leads to a similar extension of the region of gapless behavior in the presence of magnetic impurities. This gaplessness has a great impact on the spectroscopy of the cuprates, particularly for nonstoichiometric compounds. Experimental data are discussed in detail.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown