Effect of the pseudogap on the uniform magnetic susceptibility of Y 1− x Ca x Ba 2Cu 3O 7− δ

• Published in: Physica. C, Superconductivity Vol. 460; pp. 750 - 752
• Main Authors: Naqib, S.H., Cooper, J.R.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2007
• Subjects: Ca substituted Y123; Magnetic susceptibility; Pseudogap; Pseudogap; Ca substituted Y123; Magnetic susceptibility
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2007.03.168

The effects of planar hole content, p, on the temperature-dependent uniform ( q = 0) magnetic susceptibility, χ( T), of polycrystalline Y 1− x Ca x Ba 2Cu 3O 7− δ compounds with 0.0 ⩽ x ⩽ 0.20 were investigated over a wide range of oxygen deficiency ( δ). Systematic variations in χ( T) were found with changing p. The characteristic pseudogap temperature scale, E g( p)/ k B, was extracted from the analysis of the χ( T, p) data. We have found clear evidence that the pseudogap in the quasi-particle spectral weight appears abruptly at a planar hole content of p ∼ 0.19, and that it grows rapidly with decreasing p.