Magnetism and superconductivity in La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7-δ) superlattices



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Prieto, P. and Vivas, P. and Campillo, G. and Baca, E. and Castro, L. F. and Varela del Arco, María and Ballesteros, C. and Villegas, J. E. and Arias Serna, Diego and León Yebra, Carlos and Santamaría Sánchez-Barriga, Jacobo (2001) Magnetism and superconductivity in La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7-δ) superlattices. Journal of applied physics, 89 (12). pp. 8026-8029. ISSN 0021-8979

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We report on the magnetic and superconducting properties of La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7) (LCMO/YBCO) superlattices. For a constant LCMO layer thickness of 6 unit cells (u.c.), resistance and susceptibility measurements show superconductivity for YBCO layer thickness in excess of 4 unit cells. The critical temperature increases with YBCO thickness, and a T_(c) of 58 K is found for a YBCO thickness of 10 unit cells. Magnetization measurements show a ferromagnetic transition at 100 K in a (LCMO_(6u.c.)/YBCO_(5 u.c.))_(15 bilayer) superlattice, and a depressed value of the saturation magnetization of 20 emu cm^(-3). These results are discussed in terms of interface disorder (analyzed by x-ray diffraction and transmission electron microscopy) and of the possible interaction between magnetism and superconductivity.

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© 2001 American Institute of Physics. Financial support from COLCIENCIAS, Colombia, is acknowledged. Four of the authors (M.V., C.B., D.A., and J.S.) are grateful for CICYT Grant No. MAT99-1706 E. another author (J.E.V.) thanks Comunidad de Madrid for a fellowship and ClCYT Grant No. MAT 99-0724 for financial support. The authors thank Kai Lu, Chris Leighton, and Ivan K. Schuller for helpful conversations and assistance with the magnetic measurements. They thank J. L. Vicent for critical reading of the manuscript.

Uncontrolled Keywords:Giant magnetoresistance; Thin-films; Multilayers; Disorder.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:31106
Deposited On:26 Jun 2015 07:33
Last Modified:10 Dec 2018 14:58

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