Fluctuation-induced conductivity and phase separation in composite samples (YBa 2 Cu 3 O 7-δ ) 1− y –(PrBa 2 Cu 3 O 7-δ ) y.

Autor:	Monteiro, João Frederico Haas Leandro, Opata, Yuri Aparecido, Pinheiro, Lincoln Brum de Leite Gusmão, Leal, Adriane Consuelo Da Silva, Jurelo, Alcione Roberto
Předmět:	THERMAL conductivity PHASE separation COMPOSITE materials SOLID state chemistry RIETVELD refinement TEMPERATURE effect
Zdroj:	Phase Transitions; Jan2016, Vol. 89 Issue 1, p21-36, 16p
Abstrakt:	Fluctuation-induced conductivity in composite samples (YBa2Cu3O7-δ)1−y–(PrBa2Cu3O7-δ)ywas investigated. The samples withwere produced through the solid-state reaction method. Powder X-ray Rietveld analysis for the composites demonstrated that the patterns are identical to that of YBa2Cu3O7-δ. From the critical exponent analysis, it could be observed that the transport properties of composites are governed by the presence of two phases: YBa2Cu3O7-δand PrBa2Cu3O7-δ. Splitting of the pairing transition was observed and two critical temperatures were identified, but only one is strongly affected by Pr. The composite structure can be thought as a three-dimensional grain percolation system with the structure of Pr-grain and Y-grain unit cell. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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