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Electronic properties of Ba2Y1-xPrxCu3O7- delta by Azusa Matsuda; Kyoichi Kinoshita; Takao Ishii; Hiroyuki Shibata; Takao Watanabe; Tomoaki Yamada is a Physics and Astronomy article available to read on EtoBox.

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Measurement of the Hall coe%cient in the Ba2Yl -Pr"Cu307-& system has revealed that an increase in Pr concentration reduces the Hall carrier number (1/eRH) and its strong temperature dependence. The Cu formal valence calculated from the Pr valence, which has been determined to be -+3. 5, shows a weakly decreasing dependence on Pr concentration. T, shows a stronger dependence on the Hall carrier number and the Cu-0 formal valence than in the oxygen-depleted Ba2YCu307-g system. The persistence of the chain band explains this observed difference, sug- gesting that the actual Cu-0 valence dependence of the 90-K superconductor is stronger than that of the 40-K superconductor.Of known Ba2[lanthanide]Cu307 -s compounds, only the Pr compound shows neither superconductivity nor me- tallic conduction, although it has an orthorhombic struc- ture isomorphic to that of Ba2YCu307 (Refs. 1 and 2).Thus, the difference in the electronic and/or the crystal structure between these compounds might be a key pa- rameter controlling superconductivity as well as normal- state properties of the high-T, copper oxides. It is known that a series of single-phase Ba2Y1-"Pr"Cu307-s can be synthesized. 34 They co

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Author

Azusa Matsuda; Kyoichi Kinoshita; Takao Ishii; Hiroyuki Shibata; Takao Watanabe; Tomoaki Yamada

Published

1988

Language

EN

Field

Physics and Astronomy (Physical Sciences)