TRANSPORT PHENOMENA IN La2-xBaxCuOy EPITAXIAL THIN FILMS

Autor:	Rares Stiufiuc, E. Mococeanu, Aurel Pop, O. Furdui, Robert Deltour, T. Jurcut, Gheorghe Ilonca, G. Stiufiuc, C. Lung
Rok vydání:	2000
Předmět:	Superconductivity Bond length Residual resistivity Tetragonal crystal system Materials science Condensed matter physics Sputtering Electrical resistivity and conductivity Antiferromagnetism Statistical and Nonlinear Physics Thin film Condensed Matter Physics
Zdroj:	Modern Physics Letters B. 14:639-644
ISSN:	1793-6640 0217-9849
DOI:	10.1142/s0217984900000859
Popis:	The (001) oriented thin films of La 2-x Ba xCuO4+d on SrAlO4 substrates with barium composition x = 0 to 2 were grown by DC sputtering and characterized by X-ray diffraction and resistivity measurement. The films with oxygen composition d=0 showed superconductivity for x between 0.055 and 0.30. For x = 0.15, the superconducting transition was maximized to 4.3 K. When the films had d>0, Tc reached 47 K. These values are higher than those for bulk samples. The depression of Tc around x =0.125 is smaller than that for the bulk samples. The compressive strain expands the c-axis and suppresses formation of the low-temperature tetragonal phase. Both effects result in an increase in the bond length between Cu and the apical oxygen, which is responsible for the enhancement of Tc. The samples with lower residual resistivity show a higher Tc, so we suppose that the Tc enhancement is caused by reduced antiferromagnetic spin fluctuation in the CuO2 planes due to the change in the Cu–O apical bond length.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::519fa9dad28a6c72381ff2601e6f7004 https://doi.org/10.1142/s0217984900000859 Zobrazit plný text záznamu