DSpace Repository

Transport Studies of Superconducting Materials

Show simple item record

dc.contributor.advisor Li, Qiang en_US
dc.contributor.author Zhang, Cheng en_US
dc.contributor.other Department of Materials Science and Engineering en_US
dc.date.accessioned 2017-09-18T23:49:58Z
dc.date.available 2017-09-18T23:49:58Z
dc.date.issued 2016-12-01 en_US
dc.identifier.uri http://hdl.handle.net/11401/76074 en_US
dc.description 125 pg. en_US
dc.description.abstract Superconducting materials are promising for future applications on energy transport and storage. The key properties for superconductors are critical temperature Tc, critical current density Jc and upper critical field Hc2. In this dissertation, detailed transport studies were performed on two superconducting materials: FeSe0.5Te0.5 thin films and the second generation YBa2Cu3O7-δ coated conductors, in order to determine what limits the broad applications of these superconductors. High quality of FeSe0.5Te0.5 thin films were grown by pulsed laser deposition. Low temperature oxygen annealing and proton irradiation were conducted on the films, as the post-treatment techniques in order to improve the transport performance. Jc at self-field was doubled, reaching ~3 MA/cm2 in oxygen annealed films. An overall enhancement of in-field Jc was observed as well. An even greater enhanced Jc at high field was achieved in proton irradiated films, simultaneously with a Tc enhancement, rather than the degradation commonly found after irradiation in cuprate superconductors. The enhancement of the irreversibility field and upper critical filed is also observed in the irradiated films. Low temperature oxygen annealing and proton irradiation are both controllable and cost-efficient ways to enhance the Jc performance of FeSe0.5Te0.5 thin films, making this class of material very promising in potential high field applications. Gold ion irradiation was performed on second generation YBa2Cu3O7-δ coated conductors. At the optimized dosage of 2 × 10^11 cm-2, Jc performance under the field of 3 T was significantly enhanced by 70%, 98% and 64% at 5 K, 30 K and 77 K, respectively. Though reduced after irradiation, Tc and self-field Jc in the samples can be effectively recovered by post-oxygen annealing. Jc at 77 K can also be further enhanced by post-oxygen annealing for samples irradiated at certain dosages. This ion irradiation technique is now developed into the reel-to-reel method for high performance mass produced second generation coated conductors. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Materials Science en_US
dc.subject.other Coated Conductor, Critical Current, FST, Supercondcutor, Thin Film, YBCO en_US
dc.title Transport Studies of Superconducting Materials en_US
dc.type Dissertation en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Gersappe, Dilip en_US
dc.contributor.committeemember Gu, Genda en_US
dc.contributor.committeemember Wu, Jie. en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Advanced Search

Browse

My Account