Superconducting phase of TixOy thin films grown by molecular beam epitaxy

Ozbek, Yasemin; Brooks, Cooper; Zhang, Xuanyi; Al-Tawhid, Athby; Stoica, Vladmir A.; Zhang, Zhan; Kumah, Divine P.

doi:10.1103/physrevmaterials.6.064805

Superconducting phase of Ti x O y thin films grown by molecular beam epitaxy

Journal Article · Mon Jun 27 00:00:00 EDT 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.064805· OSTI ID:1908136

^[1]; ^[1]; Zhang, Xuanyi ^[1]; Al-Tawhid, Athby ^[1]; Stoica, Vladmir A. ^[2]; Zhang, Zhan ^[3]; ^[1]

North Carolina State University, Raleigh, NC (United States)
Pennsylvania State University, University Park, PA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)

Here we investigate the complex relationship between the growth conditions and the structural and transport properties of Ti_xO_y thin films grown by molecular beam epitaxy. Transport properties ranging from metallicity to superconductivity and insulating states are stabilized by effectively tuning the O/Ti ratio via the Ti flux rate and the O partial pressure P_Ox for films grown on (0001)-Al₂O₃ substrates at 850° C. A cubic c-TiO_1±δ buffer layer is formed for low O/Ti ratios, while a corundum cr-Ti₂O₃ layer is formed under higher-oxidizing conditions. Metallicity is observed for c-TiO_1-δ buffer layers. The superconducting γ -Ti₃O₅ Magnéli phase is found to nucleate on a c-TiO_1-δ buffer for intermediate POx conditions, and an insulator-superconducting transition is observed at 4.5 K (T$$^{onset}_{C}$$ = 6K) for 85 nm thick films. Strain relaxation of γ -Ti₃O₅ occurs with increasing film thickness and correlates with a thickness-dependent increase in T_C observed for Ti_xO_y thin films.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Lemont, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); State of North Carolina

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1908136

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Superconducting phase of Ti x O y thin films grown by molecular beam epitaxy

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