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- Title
Effect of Disorder on the Transport Properties of the High-T[sub c] Superconductor Nd[sub 2 – ][sub x ]Ce[sub x][sub ]CuO[sub 4 + δ].
- Authors
Ignatenkov, A. N.; Ponomarev, A. I.; Sabirzyanova, L. D.; Charikova, T. B.; Kharus, G. I.; Shelushinina, N. G.; Ivanov, A. A.; Churkin, O. A.
- Abstract
The temperature dependences ρ[sub ab](T) of Nd[sub 2 - x]Ce[sub x]CuO[sub 4 + δ] single crystals with 0 ≤ x ≤ 0.20 are studied and analyzed on the basis of the concepts in the theory of disordered 2D systems. The results are compared with the data obtained for other copper-oxide HTSC. It is found that a transition to the superconducting state in the optimal doping region 0.14 ≤ x ≤ 0.18 occurs only in crystals with a fairly small degree of disorder (k[sub F]l ≥ 2, where 1 is the mean free path). This transition is compatible with the weak 2D-localization mode as long as the localization radius is longer than the characteristic size of a Cooper pair. The superconducting transition temperature in the optimal doping region increases monotonically with the parameter k[sub F]l characterizing the degree of disorder in the crystal. The degradation of superconducting properties upon a further increase in the doping level (x > 0.18) is apparently associated with a transition from 2D to 3D conductivity in the single crystal.
- Subjects
SUPERCONDUCTORS; SUPERCONDUCTIVITY; SEMICONDUCTOR doping; TRANSITION temperature; CRYSTALS
- Publication
Journal of Experimental & Theoretical Physics, 2001, Vol 92, Issue 6, p1084
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/1.1385650