Evolution of the pseudogap state in HTSC single crystals ReBa₂Cu₃O₇₋δ (Re=Y, Ho) doped with Al and Pr
Studied has been the effect of oxygen deficiency as well as of a low (up to 5 %) Al and Pr doping on conductivity in the basis plane of the ReBa₂Cu₃O₇₋δ (Re=Y, Ho) HTSC single crystals. The excess conductivity Δσ(T) of the studied samples has been found to show an exponential character in a wide tem...
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| Date: | 2009 |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | English |
| Published: |
НТК «Інститут монокристалів» НАН України
2009
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| Series: | Functional Materials |
| Subjects: | |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Evolution of the pseudogap state in HTSC single crystals ReBa₂Cu₃O₇₋δ (Re=Y, Ho) doped with Al and Pr // R.V. Vovk, A.A. Zavgorodniy, M.A. Obolenskii, A.V. Samoilov, Y.V. Biletskiy, V.M. Pinto Simoes // Functional Materials. — 2009. — Т. 16, № 3. — С. 258-265. — Бібліогр.: 12 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | Studied has been the effect of oxygen deficiency as well as of a low (up to 5 %) Al and Pr doping on conductivity in the basis plane of the ReBa₂Cu₃O₇₋δ (Re=Y, Ho) HTSC single crystals. The excess conductivity Δσ(T) of the studied samples has been found to show an exponential character in a wide temperature range Tf<T<T*. The description of the excess conductivity as Δσ~(1-T/T*)exp(Δ*ab/T) can be interpreted within the frames of medium field theory where T* is the mean field temperature of superconducting transition. The temperature dependence of the pseudogap can be satisfactorily described in terms of the BCS-BEC crossover theoretical model. The oxygen content reduction and a low Al doping results in widening of the temperature interval where the PG mode is realized, thus narrowing the area of linear ρ(Т) dependence in the ab plane. A low Pr doping concentrations (z≈0.05) results in an unusual effect of a significant narrowing of temperature interval where the PG is realised, thus extending the linear ρ(Т) region. |
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