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High-pressure Raman study of the alkaline-earth metal fulleride, ${Ca}_{2.75} C_{60}$

A. G. V. Terzidou

Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

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T. Nakagawa

Center for High-Pressure Science & Technology Advanced Research, 100094 Beijing, P. R. China

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N. Yoshikane

Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 599-8531 Osaka, Japan

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R. Rountou

Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

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J. Rix

Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

Freiberg University of Mining and Technology, Institute of Theoretical Physics, Leipziger Straße 23, 09599 Freiberg, Germany

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O. Karabinaki

School of Chemical Engineering & Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

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D. Christofilos

School of Chemical Engineering & Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

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J. Arvanitidis

Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

E-mail Address: jarvan@physics.auth.gr

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, and

K. Prassides

Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 599-8531 Osaka, Japan

Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan

E-mail Address: k.prassides@mtr.osakafu-u.ac.jp

Corresponding author.

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https://doi.org/10.1142/S0217984920400564Cited by:3 (Source: Crossref)

This article is part of the issue:

SPECIAL ISSUE: Electron Correlation in Superconductors and Nanostructures
Guest Editors: Sergei Kruchinin and Janez Bonča

Abstract

The structural stability and electronic properties of ${Ca}_{2.75} C_{60}$ are probed by means of high-pressure Raman spectroscopy using two different pressure transmitting media that lead to practically identical results. Although ${Ca}_{2.75} C_{60}$ is isostructural with the rare-earth metal fulleride, ${Sm}_{2.75} C_{60}$ of the same stoichiometry, the pressure coefficients of characteristic intramolecular $C_{60}$ modes are larger than those in the ${Sm}_{2.75} C_{60}$ counterpart but similar to those in the pristine $C_{60}$ solid. Since the reduced pressure coefficients in the Sm fulleride have been attributed to strong $Sm - C_{60}$ coupling, our findings for the isostructural Ca fulleride are compatible with a reduced orbital mixing and $Ca - C_{60}$ coupling.

Keywords:

PACS: 78.30.Na, 62.50.-p, 61.48.-c, 71.27.+a

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