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...

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主要な著者: Jotzu, G, Meier, G, Cantaluppi, A, Cavalleri, A, Pontiroli, D, Ricco, M, Ardavan, A, Nam, M-S
フォーマット: Journal article
言語:English
出版事項: American Physical Society 2023
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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>
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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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AT meierg superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60
AT cantaluppia superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60
AT cavalleria superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60
AT pontirolid superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60
AT riccom superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60
AT ardavana superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60
AT namms superconductingfluctuationsobservedfarabovetcintheisotropicsuperconductork3c60