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Jpn. J. Appl. Phys. 26 (1987) pp. L1546-L1549  |Next Article|  |Table of Contents|
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Letter

Superconductivity of La_1+xBa_2-xCu₃O_y System: Which Layers are Doped with Carriers?

Eiji Takayama-Muromachi, Yoshishige Uchida, Atsushi Fujimori and Katsuo Kato

National Institute for Research in Inorganic Materials

(Received July 30, 1987; accepted for publication August 17, 1987)

The La_1+xBa_2-xCu₃O_y system was examined by means of ac susceptibility measurement and thermogravimetry. The superconducting transition point is affected by the La/Ba ratio: T_c decreases monotonously with increasing x, and the sample having x of at least 0.3 did not show superconductivity above 4.2 K. Moreover, it was found that T_c was dramatically reduced by the introduction of a very small quantity of oxygen defects into the rock-salt-type Ba-O layers (2g site in P4/mmm). From this fact and earlier results on YBa₂Cu₃O_y and La_2-xSr_xCuO₄, we suggest that charge carriers are holes doped mainly in the O 2p orbitals of the Ba-O layers, being consistent with a large number of experimental results reported thus far.

URL: http://jjap.jsap.jp/link?JJAP/26/L1546/
DOI: 10.1143/JJAP.26.L1546

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