Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates
We have developed a process for the fabrication of (001) oriented SrTiO3 buffer layers onto (001) MgO substrates by rf magnetron sputtering followed by a post-deposition heat treatment in air. Precursor films with Tl:Ba:Ca:Cu ratio 2:2:2:3 were deposited by dc magnetron sputtering onto both these bu...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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1998
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| _version_ | 1826299307853086720 |
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| author | Bramley, A Grovenor, C Goringe, M O'Connor, J Jenkins, A Dew-Hughes, D Reschauer, N Wagner, H Brozio, W Spreitzer, U Renk, K |
| author_facet | Bramley, A Grovenor, C Goringe, M O'Connor, J Jenkins, A Dew-Hughes, D Reschauer, N Wagner, H Brozio, W Spreitzer, U Renk, K |
| author_sort | Bramley, A |
| collection | OXFORD |
| description | We have developed a process for the fabrication of (001) oriented SrTiO3 buffer layers onto (001) MgO substrates by rf magnetron sputtering followed by a post-deposition heat treatment in air. Precursor films with Tl:Ba:Ca:Cu ratio 2:2:2:3 were deposited by dc magnetron sputtering onto both these buffered substrates and directly onto (001) SrTiO3 single-crystal substrates, and thalliated at elevated temperatures. Because of_ Sr diffusion from the substrate/buffer layer, and its subsequent substitution for Ba in the superconducting film, the single Tl-O layer phase Tl(Ba1-xSrx)2Ca2Cu3O y was stabilized. Diffusion of Ba and Ca in the opposite direction led to the formation of a Ba-Ca-Ti-O compound at the interface. The Tl(Ba1-xSrx)2Ca2Cu3O y films typically have superconducting transition temperatures (Tc's) > 103 K and critical current densities (Jc's) > 2.9 × 105 A cm-2 at 77 K. Rs values measured on these films and scaled to 10 GHz were 3.0 mΩ at 80 K and <200 μΩ at 50 K for the film grown on SrTiO3 buffered MgO, and 2.0 mΩ and 1.0 mΩ at 50 K for the film grown directly onto the (001) SrTiO3 substrate. Films fabricated on (001) SrTiO3 using an in situ deposition technique with a substrate temperature around 100°C lower than the ex situ thalliation temperature showed no evidence of an interfacial reaction layer. |
| first_indexed | 2024-03-07T04:59:56Z |
| format | Journal article |
| id | oxford-uuid:d7eead45-ffdc-4ae3-8274-d0605c472416 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:59:56Z |
| publishDate | 1998 |
| record_format | dspace |
| spelling | oxford-uuid:d7eead45-ffdc-4ae3-8274-d0605c4724162022-03-27T08:44:36ZFilm/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substratesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d7eead45-ffdc-4ae3-8274-d0605c472416EnglishSymplectic Elements at Oxford1998Bramley, AGrovenor, CGoringe, MO'Connor, JJenkins, ADew-Hughes, DReschauer, NWagner, HBrozio, WSpreitzer, URenk, KWe have developed a process for the fabrication of (001) oriented SrTiO3 buffer layers onto (001) MgO substrates by rf magnetron sputtering followed by a post-deposition heat treatment in air. Precursor films with Tl:Ba:Ca:Cu ratio 2:2:2:3 were deposited by dc magnetron sputtering onto both these buffered substrates and directly onto (001) SrTiO3 single-crystal substrates, and thalliated at elevated temperatures. Because of_ Sr diffusion from the substrate/buffer layer, and its subsequent substitution for Ba in the superconducting film, the single Tl-O layer phase Tl(Ba1-xSrx)2Ca2Cu3O y was stabilized. Diffusion of Ba and Ca in the opposite direction led to the formation of a Ba-Ca-Ti-O compound at the interface. The Tl(Ba1-xSrx)2Ca2Cu3O y films typically have superconducting transition temperatures (Tc's) > 103 K and critical current densities (Jc's) > 2.9 × 105 A cm-2 at 77 K. Rs values measured on these films and scaled to 10 GHz were 3.0 mΩ at 80 K and <200 μΩ at 50 K for the film grown on SrTiO3 buffered MgO, and 2.0 mΩ and 1.0 mΩ at 50 K for the film grown directly onto the (001) SrTiO3 substrate. Films fabricated on (001) SrTiO3 using an in situ deposition technique with a substrate temperature around 100°C lower than the ex situ thalliation temperature showed no evidence of an interfacial reaction layer. |
| spellingShingle | Bramley, A Grovenor, C Goringe, M O'Connor, J Jenkins, A Dew-Hughes, D Reschauer, N Wagner, H Brozio, W Spreitzer, U Renk, K Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates |
| title | Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates |
| title_full | Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates |
| title_fullStr | Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates |
| title_full_unstemmed | Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates |
| title_short | Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates |
| title_sort | film substrate interactions and superconducting properties of tl ba1 xsrx 2 ca2cu3oy thin films on 001 srtio3 and srtio3 buffered 001 mgo substrates |
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