Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60
<p>Alkali-doped fullerides are strongly correlated organic superconductors that exhibit high transition temperatures, exceptionally large critical magnetic fields, and a number of other unusual properties. The proximity to a Mott insulating phase is thought to be a crucial ingredient of the un...
| Autori principali: | , , , , , , , |
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| Natura: | Journal article |
| Lingua: | English |
| Pubblicazione: |
American Physical Society
2023
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| _version_ | 1826310143785041920 |
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| author | Jotzu, G Meier, G Cantaluppi, A Cavalleri, A Pontiroli, D Ricco, M Ardavan, A Nam, M-S |
| author_facet | Jotzu, G Meier, G Cantaluppi, A Cavalleri, A Pontiroli, D Ricco, M Ardavan, A Nam, M-S |
| author_sort | Jotzu, G |
| collection | OXFORD |
| description | <p>Alkali-doped fullerides are strongly correlated organic superconductors that exhibit high transition temperatures, exceptionally large critical magnetic fields, and a number of other unusual properties. The proximity to a Mott insulating phase is thought to be a crucial ingredient of the underlying physics and may also affect precursors of superconductivity in the normal state above <strong><em>T<sub>C</sub></em></strong>. We report on the observation of a sizable magneto-thermoelectric (Nernst) effect in the normal state of <strong>K<sub>3</sub>C<sub>60</sub></strong>, which displays the characteristics of superconducting fluctuations. This nonquasiparticle Nernst effect emerges from an ordinary quasiparticle background below a temperature of 80 K, far above <strong><em>T<sub>C</sub></em> = 20 K</strong>. At the lowest fields and close to <strong><em>T<sub>C</sub></em></strong>, the scaling of the effect is captured by a model based on Gaussian fluctuations. The behavior at higher magnetic fields displays a symmetry between the magnetic length and the correlation length of the system. The temperature up to which we observe fluctuations is exceptionally high for a three-dimensional isotropic system, where fluctuation effects are expected to be suppressed.</p> |
| first_indexed | 2024-03-07T07:46:13Z |
| format | Journal article |
| id | oxford-uuid:f1ea46ef-d29e-4a57-b78e-09a1fce5a97a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:46:13Z |
| publishDate | 2023 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:f1ea46ef-d29e-4a57-b78e-09a1fce5a97a2023-06-02T12:54:05ZSuperconducting fluctuations observed far above Tc in the isotropic superconductor K3C60Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f1ea46ef-d29e-4a57-b78e-09a1fce5a97aEnglishSymplectic ElementsAmerican Physical Society2023Jotzu, GMeier, GCantaluppi, ACavalleri, APontiroli, DRicco, MArdavan, ANam, M-S<p>Alkali-doped fullerides are strongly correlated organic superconductors that exhibit high transition temperatures, exceptionally large critical magnetic fields, and a number of other unusual properties. The proximity to a Mott insulating phase is thought to be a crucial ingredient of the underlying physics and may also affect precursors of superconductivity in the normal state above <strong><em>T<sub>C</sub></em></strong>. We report on the observation of a sizable magneto-thermoelectric (Nernst) effect in the normal state of <strong>K<sub>3</sub>C<sub>60</sub></strong>, which displays the characteristics of superconducting fluctuations. This nonquasiparticle Nernst effect emerges from an ordinary quasiparticle background below a temperature of 80 K, far above <strong><em>T<sub>C</sub></em> = 20 K</strong>. At the lowest fields and close to <strong><em>T<sub>C</sub></em></strong>, the scaling of the effect is captured by a model based on Gaussian fluctuations. The behavior at higher magnetic fields displays a symmetry between the magnetic length and the correlation length of the system. The temperature up to which we observe fluctuations is exceptionally high for a three-dimensional isotropic system, where fluctuation effects are expected to be suppressed.</p> |
| spellingShingle | Jotzu, G Meier, G Cantaluppi, A Cavalleri, A Pontiroli, D Ricco, M Ardavan, A Nam, M-S Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60 |
| title | Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60 |
| title_full | Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60 |
| title_fullStr | Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60 |
| title_full_unstemmed | Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60 |
| title_short | Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60 |
| title_sort | superconducting fluctuations observed far above tc in the isotropic superconductor k3c60 |
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