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Intracell changes in epitaxially strained YBa_(2)Cu_(3)O_(7-x) ultrathin layers in YBa_(2)Cu_(3)O_(7-x)/PrBa_(2)Cu_(3)O_(7) superlattices

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Varela del Arco, María and Sefrioui, Zouhair and Arias Serna, Diego and Navacerrada, M. A. and Lucía Mulas, María Luisa and López de la Torre, M. A. and León Yebra, Carlos and Loos, G. D. and Sánchez Quesada, Francisco and Santamaría Sánchez-Barriga, Jacobo (1999) Intracell changes in epitaxially strained YBa_(2)Cu_(3)O_(7-x) ultrathin layers in YBa_(2)Cu_(3)O_(7-x)/PrBa_(2)Cu_(3)O_(7) superlattices. Physical review letters, 83 (19). pp. 3936-3939. ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.83.3936


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Abstract

The structure of high quality [YBCO_(N)/PBCO_(M)]_(1000 Å) superlattices, with N ranging between 1 and 12 unit cells and M = 5 unit cells, grown by high oxygen pressure sputtering, is analyzed. Intracell atomic structure of the layers along the c axis and disorder at interfaces is investigated using an x-ray refinement technique. Negligible roughness, step disorder, and interdiffusion are found at the interfaces. Epitaxial mismatch strain results in a surprising reorganization of interatomic distances for the thinnest YBCO layers, which seems to correlated with the decrease in the critical temperature. Intracell structure is invoked as an additional source of T_(c) changes in very thin YBCO layers.


Item Type:Article
Additional Information:

© 1999 The American Physical Society. J. S. and his group thank I. K. Schuller for instruction in physics and other things in the last ten years. G. Loos thanks the sabbaticals SA 106/95 SAB1995–0685 to Universidad Complutense and Ministerio de Educación y Cultura. Financial support from CICYT Grant No. MAT94-0604 is also acknowledged.

Uncontrolled Keywords:X-ray-diffraction; Critical-temperature; T-c; Charge-transfer; Oxide superconductors; Dependence; Pressure; Oxygen.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:31224
Deposited On:21 Jul 2015 08:20
Last Modified:10 Dec 2018 14:58

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