Critical Role of Disorder for Superconductivity in the Series of Epitaxial Ti(O,N) Films
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916493356171264 |
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| author | Li, Fengmiao Dicks, Oliver Han, Myung-Geun Aamlid, Solveig Levy, Giorgio Sutarto, Ronny Liu, Chong Kung, Hsiang-Hsi Foyevstov, Oleksandr Godin, Simon Davidson, Bruce A. Damascelli, Andrea Zhu, Yimei Heil, Christoph Elfimov, Ilya Sawatzky, George A. Zou, Ke |
| author_facet | Li, Fengmiao Dicks, Oliver Han, Myung-Geun Aamlid, Solveig Levy, Giorgio Sutarto, Ronny Liu, Chong Kung, Hsiang-Hsi Foyevstov, Oleksandr Godin, Simon Davidson, Bruce A. Damascelli, Andrea Zhu, Yimei Heil, Christoph Elfimov, Ilya Sawatzky, George A. Zou, Ke |
| contents | Realizing experimental control of superconductivity is of paramount importance to advancing both basic research and technological applications. Disorder, generally existing in most superconductors, intricately interacts with Cooper pairs and also impacts the performance of quantum devices. In this paper, we report the study of a series of Ti(O,N) crystalline films prepared via molecular beam epitaxy (MBE). We discover that substituting nitrogen (N) for oxygen (O) in TiO, namely TiO(N), considerably increases the normal-state conductivity and the superconducting transition temperature Tc. The Tc of TiO(N) falling between those of TiO (about 0.5 K) and TiN (about 6 K) is contrary to their comparable Tc predicted by the Migdal Eliasberg theory. It is found that their resistivity vs temperature obeys the Mooij rule, known as the characteristic of metallic glasses. Density functional theory (DFT) calculations demonstrate that strong disorder severely scatters the Bloch electron waves at nonzero momenta, which consequently weakens electron-phonon coupling in TiO(N). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_03170 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Critical Role of Disorder for Superconductivity in the Series of Epitaxial Ti(O,N) Films Li, Fengmiao Dicks, Oliver Han, Myung-Geun Aamlid, Solveig Levy, Giorgio Sutarto, Ronny Liu, Chong Kung, Hsiang-Hsi Foyevstov, Oleksandr Godin, Simon Davidson, Bruce A. Damascelli, Andrea Zhu, Yimei Heil, Christoph Elfimov, Ilya Sawatzky, George A. Zou, Ke Superconductivity Realizing experimental control of superconductivity is of paramount importance to advancing both basic research and technological applications. Disorder, generally existing in most superconductors, intricately interacts with Cooper pairs and also impacts the performance of quantum devices. In this paper, we report the study of a series of Ti(O,N) crystalline films prepared via molecular beam epitaxy (MBE). We discover that substituting nitrogen (N) for oxygen (O) in TiO, namely TiO(N), considerably increases the normal-state conductivity and the superconducting transition temperature Tc. The Tc of TiO(N) falling between those of TiO (about 0.5 K) and TiN (about 6 K) is contrary to their comparable Tc predicted by the Migdal Eliasberg theory. It is found that their resistivity vs temperature obeys the Mooij rule, known as the characteristic of metallic glasses. Density functional theory (DFT) calculations demonstrate that strong disorder severely scatters the Bloch electron waves at nonzero momenta, which consequently weakens electron-phonon coupling in TiO(N). |
| title | Critical Role of Disorder for Superconductivity in the Series of Epitaxial Ti(O,N) Films |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2310.03170 |