In Situ Scattering Studies of Superconducting Vacancy‐Ordered Monoclinic TiO Thin Films
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<jats:title>Abstract</jats:title><jats:p>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 <jats:italic>Ti</jats:italic><jats:sub>2</jats:sub><jats:italic>O</jats:italic><jats:sub>3</jats:sub>, and the Magneli γ − <jats:italic>Ti</jats:italic><jats:sub>3</jats:sub><jats:italic>O</jats:italic><jats:sub>5</jats:sub> and γ − <jats:italic>Ti</jats:italic><jats:sub>4</jats:sub><jats:italic>O</jats:italic><jats:sub>7</jats:sub> 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.</jats:p>
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Baksi, Merve, Hawoong Hong and Divine P Kumah (n.d.). In Situ Scattering Studies of Superconducting Vacancy‐Ordered Monoclinic TiO Thin Films. Advanced Physics Research. 10.1002/apxr.202300086 Retrieved from https://hdl.handle.net/10161/29615.
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Divine P Kumah
Divine Kumah received his B.S in Physics from Southern University, Baton Rouge, and a Ph.D in Applied Physics from the University of Michigan in 2009. His postdoctoral research work was performed at the Center for Research in Interface and Surface Phenomena at Yale University. His research interests are in experimental condensed matter physics and are aimed at understanding the novel electronic and magnetic properties which emerge at the interfaces between crystalline materials.
The Kumah Research Lab uses state of the art atomic layer-by-layer deposition techniques including molecular beam epitaxy to fabricate thin crystalline oxide films. The group is focused on understanding how atomic-scale structural distortions at interfaces can be manipulated to induce novel electronic and magnetic phenomena and the development of pathways for harnessing these unique functionalities for electronic and energy applications. Tools used by the group include atomic force microscopy, electron diffraction and synchrotron-based x-ray spectroscopy and diffraction.
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