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- Title
Electron injection into superconducting trivalent fullerides close to the Mott transition boundary.
- Authors
Matsui, Keisuke; Yoshikane, Naoya; Terzidou, Anastasia G. V.; Arvanitidis, John; Kawaguchi, Shogo; Kubota, Yoshiki; Prassides, Kosmas
- Abstract
To date, superconductivity in fullerides has been almost exclusively tuned by (chemical or physical) pressure control of the conduction bandwidth, W at half filling. This contrasts sharply with the extensive control of the superconducting transition temperature, T c in atom-based superconductors such as the cuprates and iron pnictides and chalcogenides via changes in valence (bandfilling). Here, we investigate the effect of doping away from the exactly half-filled C 6 0 3 − level in quaternary face-centered-cubic (fcc) — structured fulleride solids with nominal composition ( Rb 2. 5 − x Csx) Ba 0. 5 C 6 0 (0 ≤ x ≤ 2. 5), in which divalent Ba 2 + ions partially replace monovalent alkali Rb + / Cs + ions. The resulting charged-modified fullerides in which the t 1 u bandwidth is also varied with changing x show a dome-shaped dependence of T c on interfullerene separation in analogy with their half-filled antecedents. However, following electron injection beyond half-filling, the superconductivity dome is found to shift towards shorter interfullerene separations, i.e. towards increased conduction bandwidths.
- Subjects
SUPERCONDUCTING transition temperature; IRON-based superconductors; VALENCE fluctuations; ELECTRONS; METAL-insulator transitions; SUPERCONDUCTIVITY; ELECTRON-electron interactions; ALKALI metal ions
- Publication
Modern Physics Letters B, 2024, Vol 38, Issue 21, p1
- ISSN
0217-9849
- Publication type
Article
- DOI
10.1142/S0217984923420010