Orientational ordering and electron-phonon interaction in K3C60 superconductor

Wang, Ren-Shu; Peng, Di; Hu, Jia-Wei; Zong, Li-Na; Chen, Xiao‐Jia

doi:10.1016/j.carbon.2022.03.065

Cited by 12 publications

(8 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar sign change has also been observed in K 3 C 60 thin films [17] but was absent in the study for K-and Rb-doped C 60 single crystals [75]. Interestingly, around the temperature for the sign change, the orientational ordering transition has been reported for C 60 [76] and K 3 C 60 [25,77]. The Hall effect clearly captures the effect of the orientational ordering on the electronic structure.…”

Section: G Determination Of Hall Coefficientsupporting

confidence: 83%

“…As learned from the literature for the representative magnetization [1, 10-13, 32, 33] and nearly all electrical transport [1, 15, 17, 18, 20-23, 40, 41] measurements, the evidence for the zero-resistance state and the Meissner effect taken on the same K 3 C 60 sample is quite rare. The present study together with our recent efforts [25][26][27] provides solid experimental evidence for supporting superconductivity in synthesized fullerides based on its two essential characters.…”

Section: B Superconductivity Of K3c60supporting

confidence: 55%

“…Sample synthesis. High-quality K-doped C 60 sample was synthesized by using a modified version of a solution-phase reaction process detailed previously [12,25,26]. High-purity potassium (99%, Sinopharm Chemical Reagent) and fullerene powder (99.9%, Acros Organics) were mixed with the nominal mole ratio of 3:1 (K:C 60 ).…”

Section: Methodsmentioning

confidence: 99%

“…In view of these facts, the electrical transport measurements are still challenging in the characterization of superconducting fullerides. The zeroresistance state and Meissner effect on the same sample have only been realized recently for K-and Rb-doped C 60 through the improvements of the sample quality and measurement techniques [25,26].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Full Set of Superconducting Parameters of K$_3$C$_{60}$

Wang¹,

Peng²,

Zong³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

The superconducting parameters are the key for building or identifying the theory responsible for the mechanism of superconductivity. Such parameters for fulleride superconductors have not been well established despite the tremendous efforts over the past 30 years. Here we provide a full set of parameters through a systematic study on a well-characterized K3C60 sample. The obtained high upper critical field of 33.0±0.5 T from the direct electrical transport measurements together with the relatively high critical temperature and large critical current density classifies K3C60 as a promising three-dimensional superconducting magnet material with the advantage of the rich carbon abundance on the Earth. This high upper critical field along with the large reduced superconducting energy gap and strong phonon self-energy effect supports the strong electron-phonon coupling interactions in this superconductor. The evaluation of all self-consistently obtained parameters suggests the unconventional nature of the superconductivity for K3C60 with the joint contributions from the strong electron-phonon coupling and electron correlations. These results and findings are important not only for fundamentally understanding the superconductivity in fullerides but also for future superconducting magnet developments and applications.

show abstract

Section: G Determination Of Hall Coefficientsupporting

confidence: 83%

Section: B Superconductivity Of K3c60supporting

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Full Set of Superconducting Parameters of K$_3$C$_{60}$

Wang¹,

Peng²,

Zong³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…2(i). It should be mentioned that the identification of superconductivity from both the Meissner effect and zero-resistance state on the same sample rather than different ones was only completed recently for K-doped [28,29] and Rb-doped [30] C 60 after the improvement of the synthesis technique. The early experiments for providing evidence of superconductivity either from the Meissner effect [2,3] or the zero-resistance state [31,32] or rarely from both but on the different samples [1].…”

mentioning

confidence: 99%

Robust superconductivity near constant temperature in rubidium-doped C$_{60}$

Zong¹,

Wang²,

Peng³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

To establish the doping-dependent phase diagram in alkali-metal doped C60, we synthesize Rbdoped C60 samples with different stoichiometries by using the improved wet-chemistry technique. The doping levels determined from the Raman scattering spectra often show the appearance of three electrons corresponding to the band filling of three for the synthesized compounds no matter matter what dopants are used. The multiple phase coexistence with the unique Rb3C60 is identified from the refined x-ray diffraction patterns. The phase fraction of Rb3C60 is found to behave with the doping in a similar manor as the superconducting shielding fraction. These rigorously established correlations among the superconducting transition temperature along with the structural and phonon vibrational properties allow us to single out Rb3C60 as the only superconducting phase with the nearly constant transition temperature regardless the doping level. These findings provide an experimental constraint on the theory developments for the superconductivity in fullerides.

show abstract

Superconductivity Above 100 K Predicted in Carbon‐Cage Network

Hai,

Jiang,

Tian

et al. 2023

Advanced Science

View full text Add to dashboard Cite

To explore carbide superconductors with higher transition temperature, two novel carbon structures of cage‐network are designed and their superconductivity is studied by doping metals. MC6 and MC10 are respectively identified as C24 and C32 cage‐network structures. This study finds that both carbon structures drive strong electron–phonon interaction and can exhibit superconductivity above liquid nitrogen temperature. Importantly, the superconducting transition temperatures above 100 K are predicted to be achieved in C24‐cage‐network systems doped by Na, Mg, Al, In, and Tl at ambient pressure, which is far higher than those in graphite, fullerene, and other carbides. Meanwhile, the superconductivity of cage‐network carbides is also found to be sensitive to the electronegativity and concentration of dopant M. The result indicates that the higher transition temperatures can be obtained by optimizing the carbon‐cage‐network structures and the doping conditions. The study suggests that the carbon‐cage‐network structure is a direction to explore high‐temperature superconducting carbides.

show abstract

Orientational ordering and electron-phonon interaction in K3C60 superconductor

Cited by 12 publications

References 61 publications

Full Set of Superconducting Parameters of K$_3$C$_{60}$

Full Set of Superconducting Parameters of K$_3$C$_{60}$

Robust superconductivity near constant temperature in rubidium-doped C$_{60}$

Superconductivity Above 100 K Predicted in Carbon‐Cage Network

Contact Info

Product

Resources

About