Letter to the Editor

Defect-induced changes in the spectral properties of high-Tc cuprates

I. Vobornik ; Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
E. Berger ; Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
F. Rullier-Albenque ; Laboratoire des Solides Irradiés, CEA, Ecole Polytechnique, 91128 Palaiseau Cedex, France
G. Margaritondo ; Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
D. Pavuna ; Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
L. Forró ; Laboratoire de Physique des Solides Semicristallins, IGA, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
M. Grioni ; Institut de Physique Appliquée, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland

Abstract

Superconductivity in high-Tc cuprates is particularly sensitive to disorder due to the unconventional d-wave pairing symmetry. We investigated effects of disorder on the spectral properties of Bi2Sr2CaCu2O8+x high-Tc superconductor. We found that already small defect densities suppress the characteristic spectral signature of the superconducting state. The spectral line shape clearly reflects new excitations within the gap, as expected for defect-induced pair breaking. At the lowest defect concentrations the normal state remains unaffected, while increased disorder leads to suppression of the normal quasiparticle peaks.

Keywords

superconductivity; high-Tc cuprates; effects of disorder; spectral properties; Bi2Sr2CaCu2O8+x; defect-induced pair breaking; suppression of the normal quasiparticle peaks

Hrčak ID:

300963

URI

https://hrcak.srce.hr/300963

Publication date:

1.7.1999.

Article data in other languages: croatian

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