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Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60

Jotzu, G., Meier, G., Cantaluppi, A., Cavalleri, A., Pontiroli, D., Riccò, M., et al. (2021). Superconducting fluctuations observed far above Tc in the isotropic superconductor K3C60.

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2109.08679.pdf (Preprint), 2MB
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2021

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https://arxiv.org/abs/2109.08679 (Preprint)
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Creators:
Jotzu, G.1, Author
Meier, G.2, Author
Cantaluppi, A.1, Author
Cavalleri, A.1, 3, Author
Pontiroli, D.4, Author
Riccò, M.4, Author
Ardavan, A.3, Author
Nam, M.S.3, Author
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293
2Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074319
3Department of Physics, Clarendon Laboratory, University of Oxford, ou_persistent22
4Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università degli Studi di Parma,, ou_persistent22

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Free keywords: Condensed Matter, Superconductivity, cond-mat.supr-con, Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el,Quantum Physics, quant-ph
Abstract: 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 T$_\text{c}$. We report on the observation of a sizeable magneto-thermoelectric (Nernst) effect in the normal state of K$_3$C$_{60}$, which displays the characteristics of superconducting fluctuations. The anomalous Nernst effect emerges from an ordinary quasiparticle background below a temperature of 80K, far above T$_\text{c}$ = 20K. At the lowest fields and close to T$_\text{c}$, the scaling of the effect is captured by a model based on Gaussian fluctuations. The temperature up to which we observe fluctuations is exceptionally high for a three-dimensional isotropic system, where fluctuation effects are usually suppressed.

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Language(s): eng - English
Dates: 2021-09-17
Publication Status: Published online
Pages: 9
Publishing info: -
Rev. Type: No review
Identifiers: arXiv: 2109.08679
Degree: -

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