Here we report a structural and electronic investigation of the recently discovered CaCuO2 = SrTiO3 superconducting artificial superlattices based on two insulating oxides. We show that T-c= 50 K is reached in the superlattices grown on NdGaO3 substrate under optimized growth conditions. If the superlattices are grown on LaAlO3 substrate the Tc is drastically reduced due to the much higher lattice mismatch between CaCuO2 and LaAlO3, which has lattice parameters substantially smaller than NdGaO3. The consequent in-plane lattice contraction also makes the incorporation of extra oxygen atoms more difficult, leading to a decrease of hole doping and Tc. Finally, x-ray absorption spectroscopy study as a function of the thickness of the CaCuO2 block in CaCuO2 = SrTiO3 superconducting superlattices has revealed the important role played by the interfaces as the location of hole doping and superconductivity in these systems.

DI CASTRO, D., Aruta, C., Tebano, A., Innocenti, D., Minola, M., Sala, M., et al. (2014). T-c up to 50 K in superlattices of insulating oxides. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 27(4) [10.1088/0953-2048/27/4/044016].

T-c up to 50 K in superlattices of insulating oxides

DI CASTRO, DANIELE;TEBANO, ANTONELLO;BALESTRINO, GIUSEPPE
2014-04-01

Abstract

Here we report a structural and electronic investigation of the recently discovered CaCuO2 = SrTiO3 superconducting artificial superlattices based on two insulating oxides. We show that T-c= 50 K is reached in the superlattices grown on NdGaO3 substrate under optimized growth conditions. If the superlattices are grown on LaAlO3 substrate the Tc is drastically reduced due to the much higher lattice mismatch between CaCuO2 and LaAlO3, which has lattice parameters substantially smaller than NdGaO3. The consequent in-plane lattice contraction also makes the incorporation of extra oxygen atoms more difficult, leading to a decrease of hole doping and Tc. Finally, x-ray absorption spectroscopy study as a function of the thickness of the CaCuO2 block in CaCuO2 = SrTiO3 superconducting superlattices has revealed the important role played by the interfaces as the location of hole doping and superconductivity in these systems.
apr-2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
English
oxide heterostructures; superconductivity; pulsed laser deposition
Articolo n. 044016
DI CASTRO, D., Aruta, C., Tebano, A., Innocenti, D., Minola, M., Sala, M., et al. (2014). T-c up to 50 K in superlattices of insulating oxides. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 27(4) [10.1088/0953-2048/27/4/044016].
DI CASTRO, D; Aruta, C; Tebano, A; Innocenti, D; Minola, M; Sala, M; Prellier, W; Lebedev, O; Balestrino, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/95373
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