Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/21382
Title: Structural and electronic response of overexpanded superconducting fullerides close to the Mott insulator boundary
Authors: Menelaou, Melita 
Takabayashi, Yasuhiro 
Okur, H. Esma 
Zadik, Ruth H. 
Prassides, Kosmas 
Major Field of Science: Engineering and Technology
Field Category: Chemical Engineering
Keywords: electronic phase diagram;insulator-metal transition;Mott insulator;strong correlations;Superconductivity
Issue Date: Jul-2018
Source: International Journal of Modern Physics B, vol. 32, no.17, art. no.1840020, 10 July 2018
Volume: 32
Issue: 17
Journal: International Journal of Modern Physics B 
Abstract: The ternary fulleride, Rb0.25Cs2.75C60, is the most expanded member of the family of face-centered cubic (fcc) structured superconducting fullerides ever accessed with superconductivity surviving at ambient pressure closest to the Mott insulator boundary. Here, we study the evolution of its structural and electronic properties with temperature. At ambient temperature, Rb0.25Cs2.75C60 lies in the Mott-Jahn-Teller (MJT) insulating part of the phase diagram. High-resolution synchrotron X-ray diffraction shows that its structure remains strictly cubic at all temperatures, but the transition to the metallic state at ∼ 50 K - evident in the evolution of the magnetic susceptibility with temperature - is accompanied by a lattice collapse, ΔV/V0 of - 0.5%. Bulk superconductivity then emerges on further cooling with a Tc of 25.9 K. The results permit the extension of the electronic phase diagram of A3C60 fullerides as close as possible to the metal-insulator (M-I) crossover.
Description: Funding text This work was sponsored by the World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials, Ministry of Education, Culture, Sports, Science and Technology of Japan. We acknowledge the financial support from the Mitsubishi Foundation and the Japan Society for the Promotion of Science (JSPS) under the Scientific Research on Innovative Areas ‘J-Physics’ (No. JP15H05882) and ‘pi-System Figuration’ (JP17H05139) Projects. We thank
URI: https://hdl.handle.net/20.500.14279/21382
ISSN: 02179792
DOI: 10.1142/S0217979218400209
Rights: © 2018 World Scientific Publishing Company.
Type: Conference Catalogue
Affiliation : Tohoku University 
Bursa Technical University 
Durham University 
Funding: Ministry of Education, Culture, Sports, Science and Technology (MEXT) Mitsubishi Foundation Japan Society for the Promotion of Science (JSPS)
Publication Type: Peer Reviewed
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