YBa2Cu3O7-x/SrTiO3//LaAlO3 heterostructures obtained by injection MOCVD |
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| Authors: | J Lindner F Weiss J P Senateur A Abrutis |
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| Affiliation: | 1. LMGP, INPG, CNRS UMR5628 , St Martin d'Hères, France;2. Kackertstr , 15-17, AIXTRON AG, Aachen, Germany;3. LMGP, INPG, CNRS UMR5628 , St Martin d'Hères, France;4. DGIC, Vilnius University , 2006 Vilnius, Lithuania |
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| Abstract: | Abstract YBa2Cu3O7-x /BaxSr1-xTiO3 /LaAlO3 heterostructures can be used as a basis for devices with voltage control in microwave circuits. BaxSr1-xTiO3 (x=0–0.1) (BST) thin films have been epitaxially grown on LaAlO3 substrates using injection MOCVD. The excellent crystalline quality of the obtained BST films can be proven by a FWHM of <0,2° for the rocking curve of the (002) BST reflection. An AFM study revealed flat surfaces, showing a surface roughness Rs as low as 1nm. YBa2Cu3O7-x/BaxSr1-x TiO3//LaAlO3 heterostructures were than optimised. The YBa2Cu3O7-x (YBCO) layers obtained on BaxSr1-xTiO3 films are epitaxial with a FWHM of 0.45° for the (005) YBCO rocking curve and display very promising superconducting properties of Tc=92K. Finally the microwave properties of the superconducting films were studied. For YBa2Cu3O7-x layers directly deposited on LaAlO3, surface resistance values of 0,32mΩ were obtained, while for YBa2Cu3O7-x /SrTiO3//LaAlO3 heterostructures, higher values of 1mΩ at 8.5GHz were measured. |
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| Keywords: | Injection MOCVD Films BaxSr1-xTiO3 Oxide Superconductors X-ray Electrical Properties |
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