Defect-induced changes in the spectral properties of high-T<sub>c</sub> cuprates

Superconductivity in high-T<sub>c</sub> cuprates is particularly sensitive to disorder due to the unconventional d-wave pairing symmetry. We investigated effects of disorder on the spectral properties of Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+x</sub> high-T<sub>c</sub> 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


Published in:
Fizika A, 8, 3, 107-12
Year:
1999
Keywords:
Note:
Inst. de Phys. Appliquee, Ecole Polytech. Federale de Lausanne, Switzerland
Copyright 2000, IEE
6642799
1330-0008
defect-induced changes
spectral properties
high-Tc cuprates
d-wave pairing symmetry
disorder
Bi2Sr2CaCu2O8+x
high-Tc superconductor
defect densities
characteristic spectral signature
superconducting state
spectral line shape
defect-induced pair breaking
defect concentrations
normal state
normal quasiparticle peak suppression
Bi2Sr2CaCu2O8
Laboratories:




 Record created 2006-10-03, last modified 2018-12-03


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