Enhancement of the superconducting transition temperature of La 2-x Srx CuO4 and La1.875 Ba 0.125 CuO4 bilayers: Bilayer and reference film prepared on the same wafer

G. Koren*, O. Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Recently, a paper was published by Yuli [Phys. Rev. Lett. 101, 057005 (2008)], in which a large Tc enhancement was reported in bilayers of the nonsuperconducting La1.65 Sr0.35 CuO4 and superconducting La2-x Srx CuO4 in the underdoped regime, in comparison with the same bare La2-x Sr x CuO4 film. This result however, was not reproduced in the present experiments and an effort is made trying to resolve this puzzle. The difference in the present study is that both the bilayer and the bare reference film were prepared in the same deposition run on different parts of the same wafer. This is in contrast to the previous experiments where the bilayers and bare reference films were prepared in different runs and on different wafers. Nevertheless, a small but clear Tc enhancement effect of 1.4-2 K is found in the present study in a similar system of La1.65 Sr 0.35 CuO4 -La1.875 Ba0.125 CuO 4 bilayers, which is in line with the theoretical arguments presented previously.

Original languageAmerican English
Article number134516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number13
DOIs
StatePublished - 15 Apr 2010

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