Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3]
We have observed a softening of phonons and a structural phase transition in a superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] (T[subscript c] = 31 K) single crystal using elastic and inelastic neutron scattering measurements. The soft phonon occurs for the [1 1 1] transverse aco...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2016
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| Online Access: | http://hdl.handle.net/1721.1/102206 https://orcid.org/0000-0002-7022-8313 |
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| author | Kang, H. J. Lee, Young S. Lynn, J. W. Shiryaev, S. V. Barilo, S. N. |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Kang, H. J. Lee, Young S. Lynn, J. W. Shiryaev, S. V. Barilo, S. N. |
| author_sort | Kang, H. J. |
| collection | MIT |
| description | We have observed a softening of phonons and a structural phase transition in a superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] (T[subscript c] = 31 K) single crystal using elastic and inelastic neutron scattering measurements. The soft phonon occurs for the [1 1 1] transverse acoustic mode at the zone boundary. The phonon energies in this vicinity are found to continuously decrease with decreasing temperature from above room temperature. This softening stops at a temperature close to T[subscript s], where a structural phase transition from cubic to tetragonal symmetry occurs. The overall results are consistent with previous data that reported phonon softening and a (0.5, 0.5, 0.5) type superstructure in several Ba[subscript 1−x]K[subscript x]BiO[subscript 3] systems. However, we also find weaker (0.5, 0.5, 0) type superstructure peaks that reveal an additional component to the modulation. No significant change related to the superconductivity was observed for these soft phonon energies or linewidths. |
| first_indexed | 2024-09-23T10:24:46Z |
| format | Article |
| id | mit-1721.1/102206 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:24:46Z |
| publishDate | 2016 |
| publisher | Elsevier |
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| spelling | mit-1721.1/1022062022-09-26T17:43:07Z Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] Kang, H. J. Lee, Young S. Lynn, J. W. Shiryaev, S. V. Barilo, S. N. Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Physics Lee, Young S. We have observed a softening of phonons and a structural phase transition in a superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] (T[subscript c] = 31 K) single crystal using elastic and inelastic neutron scattering measurements. The soft phonon occurs for the [1 1 1] transverse acoustic mode at the zone boundary. The phonon energies in this vicinity are found to continuously decrease with decreasing temperature from above room temperature. This softening stops at a temperature close to T[subscript s], where a structural phase transition from cubic to tetragonal symmetry occurs. The overall results are consistent with previous data that reported phonon softening and a (0.5, 0.5, 0.5) type superstructure in several Ba[subscript 1−x]K[subscript x]BiO[subscript 3] systems. However, we also find weaker (0.5, 0.5, 0) type superstructure peaks that reveal an additional component to the modulation. No significant change related to the superconductivity was observed for these soft phonon energies or linewidths. 2016-04-08T14:50:00Z 2016-04-08T14:50:00Z 2011-03 2011-01 Article http://purl.org/eprint/type/JournalArticle 09214534 http://hdl.handle.net/1721.1/102206 Kang, H.J., Y.S. Lee, J.W. Lynn, S.V. Shiryaev, and S.N. Barilo. “Soft Phonons and Structural Phase Transition in Superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3].” Physica C: Superconductivity 471, no. 9–10 (May 2011): 303–307. https://orcid.org/0000-0002-7022-8313 en_US http://dx.doi.org/10.1016/j.physc.2011.02.010 Physica C: Superconductivity Creative Commons Attribution-Noncommercial-NoDerivatives http://creativecommons.org/licenses/by/4.0/ application/pdf Elsevier Arxiv |
| spellingShingle | Kang, H. J. Lee, Young S. Lynn, J. W. Shiryaev, S. V. Barilo, S. N. Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] |
| title | Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] |
| title_full | Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] |
| title_fullStr | Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] |
| title_full_unstemmed | Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] |
| title_short | Soft phonons and structural phase transition in superconducting Ba[subscript 0.59]K[subscript 0.41]BiO[subscript 3] |
| title_sort | soft phonons and structural phase transition in superconducting ba subscript 0 59 k subscript 0 41 bio subscript 3 |
| url | http://hdl.handle.net/1721.1/102206 https://orcid.org/0000-0002-7022-8313 |
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