Superconductivity in Sr2RuO4-Sr3Ru2O7 eutectic crystals

R. Fittipaldi; A. Vecchione; R. Ciancio; S. Pace; M. Cuoco; D. Stornaiuolo; D. Born; F. Tafuri; E. Olsson; S. Kittaka; H. Yaguchi; Y. Maeno

doi:10.1209/0295-5075/83/27007

All issues

Volume 83 / No 2 (July 2008)

EPL, 83 2 (2008) 27007

Abstract

Issue		EPL Volume 83, Number 2, July 2008


Article Number		27007
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/83/27007
Published online		03 July 2008

EPL, 83 (2008) 27007

Superconductivity in Sr₂RuO₄-Sr₃Ru₂O₇ eutectic crystals

R. Fittipaldi¹^,2, A. Vecchione¹^,2, R. Ciancio¹^,2^,3, S. Pace¹^,2, M. Cuoco¹^,2, D. Stornaiuolo⁴, D. Born⁴, F. Tafuri⁴^,5, E. Olsson³, S. Kittaka⁶, H. Yaguchi⁶ and Y. Maeno⁶

¹ CNR-INFM, Laboratorio Regionale SuperMat - Baronissi (SA), Italy, EU
² Dipartimento di Fisica “E. R. Caianiello", Università di Salerno - Baronissi (SA), Italy, EU
³ Department of Applied Physics, Chalmers University of Technology, University of Chalmers - Goteborg, Sweden, EU
⁴ CNR-INFM Coherentia and Dipartimento di Scienze Fisiche, Università di Napoli Federico II - Napoli, Italy, EU
⁵ Dipartimento Ingegneria dell'Informazione, Seconda Università di Napoli - Aversa (CE), Italy, EU
⁶ Department of Physics, Kyoto University - Kyoto 606-8502, Japan

Received: 17 March 2008
Accepted: 4 June 2008

Abstract

Superconducting behavior has been observed in the Sr₂RuO₄-Sr₃Ru₂O₇ eutectic system as grown by the flux-feeding floating-zone technique. A supercurrent flows across a single interface between Sr₂RuO₄ and Sr₃Ru₂O₇ areas at distances that are far beyond those expected in a conventional proximity effect. The current-voltage characteristics within the Sr₃Ru₂O₇ macrodomain, as extracted from the eutectic, exhibit signatures of superconductivity in the bilayered Sr₃Ru₂O₇ region. Detailed microstructural, morphological and compositional analyses address issues on the concentration and the size of Sr₂RuO₄ inclusions within the Sr₃Ru₂O₇ matrix. We speculate on the possibility of inhomogeneous superconductivity in the eutectic Sr₃Ru₂O₇ and exotic pairing induced by the Sr₂RuO₄ inclusions.

PACS: 74.70.Pq – Ruthenates / 74.25.Sv – Critical currents / 61.05.C- – X-ray diffraction and scattering

© EPLA, 2008

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