Geodesic
The effect of doping on the superconductivity of the $\mathrm{YBa_2Cu_3O_y}$
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2005), pp. 46-51

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The superconducting ceramic samples in $\mathrm{Y-Ba-Cu-O}$ system with various content of fluorine are synthesized. It is found, that even slight doping of $\mathrm{YBa_2Cu_3O_yF_x}$ by fluorine $(х=0,05)$ shifts of the superconducting transition towards high temperatures by $10-12 K$. The obtained data are interpreted suggesting the generation of acceptor levels in a forbidden band and presence of holes in $\mathrm{YBa_2Cu_3O_y}$ when doping by fluorine, that enhances the temperature of charge carrier "pairing". 
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     title = {The effect of doping on the superconductivity of the $\mathrm{YBa_2Cu_3O_y}$},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {46--51},
     publisher = {mathdoc},
     number = {2},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2005_2_a6/}
}
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Y. G. Zargaryan; A. I. Vahanyan; N. P. Harutyunyan; E. V. Aghababyan; K. H. Begoyan; E. A. Mughnetsyan; H. R. Hovhannisyan. The effect of doping on the superconductivity of the $\mathrm{YBa_2Cu_3O_y}$. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2005), pp. 46-51. http://geodesic.mathdoc.fr/item/UZERU_2005_2_a6/