Superconductivity Behavior in Epitaxial Ti N Films Points to Surface Magnetic Disorder

N. A. Saveskul; N. A. Titova; E. M. Baeva; A. V. Semenov; A. V. Lubenchenko; S. Saha; H. Reddy; S. I. Bogdanov; E. E. Marinero; V. M. Shalaev; A. Boltasseva; V. S. Khrapai; A. I. Kardakova; G. N. Goltsman

doi:10.1103/PhysRevApplied.12.054001

Superconductivity Behavior in Epitaxial Ti N Films Points to Surface Magnetic Disorder

N. A. Saveskul, N. A. Titova, E. M. Baeva, A. V. Semenov, A. V. Lubenchenko, S. Saha, H. Reddy, S. I. Bogdanov, E. E. Marinero, V. M. Shalaev, A. Boltasseva, V. S. Khrapai, A. I. Kardakova, G. N. Goltsman

Research output: Contribution to journal › Article › peer-review

Abstract

We analyze the evolution of the normal and superconducting properties of epitaxial TiN films, characterized by high Ioffe-Regel parameter values, as a function of the film thickness. As the film thickness decreases, we observe an increase of the residual resistivity, that becomes dominated by diffusive surface scattering for d≤20nm. At the same time, a substantial thickness-dependent reduction of the superconducting critical temperature is observed compared to the bulk TiN value. In such high-quality material films, this effect can be explained by a weak magnetic disorder residing in the surface layer with a characteristic magnetic defect density of approximately 1012cm-2. Our results suggest that surface magnetic disorder is generally present in oxidized TiN films.

Original language	English (US)
Article number	054001
Journal	Physical Review Applied
Volume	12
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevApplied.12.054001
State	Published - Nov 1 2019
Externally published	Yes

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General Physics and Astronomy

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Saveskul, N. A., Titova, N. A., Baeva, E. M., Semenov, A. V., Lubenchenko, A. V., Saha, S., Reddy, H., Bogdanov, S. I., Marinero, E. E., Shalaev, V. M., Boltasseva, A., Khrapai, V. S., Kardakova, A. I., & Goltsman, G. N. (2019). Superconductivity Behavior in Epitaxial Ti N Films Points to Surface Magnetic Disorder. Physical Review Applied, 12(5), Article 054001. https://doi.org/10.1103/PhysRevApplied.12.054001

Saveskul, NA, Titova, NA, Baeva, EM, Semenov, AV, Lubenchenko, AV, Saha, S, Reddy, H, Bogdanov, SI, Marinero, EE, Shalaev, VM, Boltasseva, A, Khrapai, VS, Kardakova, AI & Goltsman, GN 2019, 'Superconductivity Behavior in Epitaxial Ti N Films Points to Surface Magnetic Disorder', Physical Review Applied, vol. 12, no. 5, 054001. https://doi.org/10.1103/PhysRevApplied.12.054001

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abstract = "We analyze the evolution of the normal and superconducting properties of epitaxial TiN films, characterized by high Ioffe-Regel parameter values, as a function of the film thickness. As the film thickness decreases, we observe an increase of the residual resistivity, that becomes dominated by diffusive surface scattering for d≤20nm. At the same time, a substantial thickness-dependent reduction of the superconducting critical temperature is observed compared to the bulk TiN value. In such high-quality material films, this effect can be explained by a weak magnetic disorder residing in the surface layer with a characteristic magnetic defect density of approximately 1012cm-2. Our results suggest that surface magnetic disorder is generally present in oxidized TiN films.",

author = "Saveskul, {N. A.} and Titova, {N. A.} and Baeva, {E. M.} and Semenov, {A. V.} and Lubenchenko, {A. V.} and S. Saha and H. Reddy and Bogdanov, {S. I.} and Marinero, {E. E.} and Shalaev, {V. M.} and A. Boltasseva and Khrapai, {V. S.} and Kardakova, {A. I.} and Goltsman, {G. N.}",

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doi = "10.1103/PhysRevApplied.12.054001",

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AU - Saveskul, N. A.

AU - Titova, N. A.

AU - Baeva, E. M.

AU - Semenov, A. V.

AU - Lubenchenko, A. V.

AU - Saha, S.

AU - Reddy, H.

AU - Bogdanov, S. I.

AU - Marinero, E. E.

AU - Shalaev, V. M.

AU - Boltasseva, A.

AU - Khrapai, V. S.

AU - Kardakova, A. I.

AU - Goltsman, G. N.

PY - 2019/11/1

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N2 - We analyze the evolution of the normal and superconducting properties of epitaxial TiN films, characterized by high Ioffe-Regel parameter values, as a function of the film thickness. As the film thickness decreases, we observe an increase of the residual resistivity, that becomes dominated by diffusive surface scattering for d≤20nm. At the same time, a substantial thickness-dependent reduction of the superconducting critical temperature is observed compared to the bulk TiN value. In such high-quality material films, this effect can be explained by a weak magnetic disorder residing in the surface layer with a characteristic magnetic defect density of approximately 1012cm-2. Our results suggest that surface magnetic disorder is generally present in oxidized TiN films.

AB - We analyze the evolution of the normal and superconducting properties of epitaxial TiN films, characterized by high Ioffe-Regel parameter values, as a function of the film thickness. As the film thickness decreases, we observe an increase of the residual resistivity, that becomes dominated by diffusive surface scattering for d≤20nm. At the same time, a substantial thickness-dependent reduction of the superconducting critical temperature is observed compared to the bulk TiN value. In such high-quality material films, this effect can be explained by a weak magnetic disorder residing in the surface layer with a characteristic magnetic defect density of approximately 1012cm-2. Our results suggest that surface magnetic disorder is generally present in oxidized TiN films.

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Superconductivity Behavior in Epitaxial Ti N Films Points to Surface Magnetic Disorder

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