2022
DOI: 10.1021/acsnano.1c11161
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Two-Dimensional Superconductivity of Ca-Intercalated Graphene on SiC: Vital Role of the Interface between Monolayer Graphene and the Substrate

Abstract: Ca-intercalation has enabled superconductivity in graphene on SiC. However, the atomic and electronic structures that are critical for superconductivity are still under discussion. We find an essential role of the interface between monolayer graphene and the SiC substrate for superconductivity. In the Ca-intercalation process, at the interface a carbon layer terminating SiC changes to graphene by Ca-termination of SiC (monolayer graphene becomes a bilayer), inducing more electrons than a free-standing model. T… Show more

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Cited by 31 publications
(38 citation statements)
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“…C 6 CaC 6 was prepared on a trilayer graphene film epitaxially grown on a SiC(0001) substrate by a direct Ca intercalation. This is in sharp contrast to previous work, in which the preparation of metal-intercalated graphene needed a preintercalation of Li atoms. ,, We succeeded in observing a superconducting energy gap and diamagnetic response of C 6 CaC 6 , from which the strong coupling superconductivity with an isotropic s -wave symmetry was revealed. Notably, the critical temperature ( T c ) found here is remarkably higher than that in previous works, , which can possibly be attributed to the suppression of charge-density waves (CDW).…”
contrasting
confidence: 83%
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“…C 6 CaC 6 was prepared on a trilayer graphene film epitaxially grown on a SiC(0001) substrate by a direct Ca intercalation. This is in sharp contrast to previous work, in which the preparation of metal-intercalated graphene needed a preintercalation of Li atoms. ,, We succeeded in observing a superconducting energy gap and diamagnetic response of C 6 CaC 6 , from which the strong coupling superconductivity with an isotropic s -wave symmetry was revealed. Notably, the critical temperature ( T c ) found here is remarkably higher than that in previous works, , which can possibly be attributed to the suppression of charge-density waves (CDW).…”
contrasting
confidence: 83%
“…This is in sharp contrast to previous work, in which the preparation of metal-intercalated graphene needed a preintercalation of Li atoms. ,, We succeeded in observing a superconducting energy gap and diamagnetic response of C 6 CaC 6 , from which the strong coupling superconductivity with an isotropic s -wave symmetry was revealed. Notably, the critical temperature ( T c ) found here is remarkably higher than that in previous works, , which can possibly be attributed to the suppression of charge-density waves (CDW).…”
contrasting
confidence: 83%
See 3 more Smart Citations