Experimental Observation of Short-Range Magnetic Correlations in Amorphous Nb$_2$O$_5$ and Ta$_2$O$_5$ Thin Films
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2025
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| author | Krasnikova, Y. V. Murthy, A. A. Bafia, D. Crisa, F. Clairmont, A. Sung, Z. Lee, J. Cano, A. Shinde, M. van Zanten, D. M. T. Bal, M. Romanenko, A. Grassellino, A. Dhundhwal, R. Fuchs, D. Reisinger, T. Pop, I. M. Suter, A. Prokscha, T. Salman, Z. |
| author_facet | Krasnikova, Y. V. Murthy, A. A. Bafia, D. Crisa, F. Clairmont, A. Sung, Z. Lee, J. Cano, A. Shinde, M. van Zanten, D. M. T. Bal, M. Romanenko, A. Grassellino, A. Dhundhwal, R. Fuchs, D. Reisinger, T. Pop, I. M. Suter, A. Prokscha, T. Salman, Z. |
| contents | We use muon spin rotation/relaxation/resonance ($μ$SR) to investigate the magnetic properties of niobium pentoxide (Nb$_2$O$_5$) and tantalum pentoxide (Ta$_2$O$_5$) thin films. In both oxides, we observe a magnetic response at the lowest available temperature of 2.8 K. This response appears to be structurally dependent: thermally oxidized Ta$_2$O$_5$ with low crystallinity demonstrates suppressed magnetism, while fully amorphous Ta$_2$O$_5$ demonstrates local static magnetism. In contrast, amorphous Nb$_2$O$_5$ is dominated by magnetic fluctuations and is strongly magnetically disordered compared to Ta$_2$O$_5$. Our results suggest that these fundamental differences in the magnetism of Ta and Nb oxides could explain the performance limitations in superconducting qubits and resonators. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_07957 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental Observation of Short-Range Magnetic Correlations in Amorphous Nb$_2$O$_5$ and Ta$_2$O$_5$ Thin Films Krasnikova, Y. V. Murthy, A. A. Bafia, D. Crisa, F. Clairmont, A. Sung, Z. Lee, J. Cano, A. Shinde, M. van Zanten, D. M. T. Bal, M. Romanenko, A. Grassellino, A. Dhundhwal, R. Fuchs, D. Reisinger, T. Pop, I. M. Suter, A. Prokscha, T. Salman, Z. Other Condensed Matter Quantum Physics We use muon spin rotation/relaxation/resonance ($μ$SR) to investigate the magnetic properties of niobium pentoxide (Nb$_2$O$_5$) and tantalum pentoxide (Ta$_2$O$_5$) thin films. In both oxides, we observe a magnetic response at the lowest available temperature of 2.8 K. This response appears to be structurally dependent: thermally oxidized Ta$_2$O$_5$ with low crystallinity demonstrates suppressed magnetism, while fully amorphous Ta$_2$O$_5$ demonstrates local static magnetism. In contrast, amorphous Nb$_2$O$_5$ is dominated by magnetic fluctuations and is strongly magnetically disordered compared to Ta$_2$O$_5$. Our results suggest that these fundamental differences in the magnetism of Ta and Nb oxides could explain the performance limitations in superconducting qubits and resonators. |
| title | Experimental Observation of Short-Range Magnetic Correlations in Amorphous Nb$_2$O$_5$ and Ta$_2$O$_5$ Thin Films |
| topic | Other Condensed Matter Quantum Physics |
| url | https://arxiv.org/abs/2505.07957 |