In Situ Scattering Studies of Superconducting Vacancy‐Ordered Monoclinic TiO Thin Films

Baksi, Merve; Hong, Hawoong; Kumah, Divine P.

doi:10.1002/apxr.202300086

In Situ Scattering Studies of Superconducting Vacancy‐Ordered Monoclinic TiO Thin Films

Journal Article · Wed Nov 22 00:00:00 EST 2023 · Advanced Physics Research

DOI:https://doi.org/10.1002/apxr.202300086· OSTI ID:2217683

Baksi, Merve ^[1]; ^[2]; ^[3]

Department of Physics North Carolina State University Raleigh NC 27695 USA
Advanced Photon Source Lemont IL 76019 USA
Department of Physics North Carolina State University Raleigh NC 27695 USA, Department of Physics Duke University Durham NC 27708 USA

Abstract

The structural and transport properties of vacancy‐ordered monoclinic superconducting titanium oxide (TiO) thin films grown by molecular beam epitaxy are investigated. The evolution of the crystal structure during growth is monitored by in situ synchrotron X‐ray diffraction. Long‐range ordering of Ti and O vacancies in the disordered cubic phase stabilizes the vacancy‐ordered monoclinic TiO phase. The reduced structural disorder arising from vacancy‐ordering is correlated with a superconductor‐metal transition (SMT) in contrast to the superconductor‐insulator transition (SIT) observed in cubic TiO, orthorhombic Ti ₂ O ₃ , and the Magneli γ − Ti ₃ O ₅ and γ − Ti ₄ O ₇ phase. Magnetoresistance measurements for the SIT phases indicate superconducting fluctuations persisting in the normal phase. These results confirm the role of disorder related to Ti and O vacancies and structural inhomogeneity in determining the electronic properties of the normal state of titanium oxide‐based superconductors.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2217683

Alternate ID(s):: OSTI ID: 2222526

Journal Information:: Advanced Physics Research, Journal Name: Advanced Physics Research Journal Issue: 3 Vol. 3; ISSN 2751-1200

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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