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Structural and electronic response of overexpanded superconducting fullerides close to the Mott insulator boundary

M. Menelaou

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

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Y. Takabayashi

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

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H. E. Okur

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

Department of Chemistry, Bursa Technical University, Bursa 16310, Turkey

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R. H. Zadik

Department of Chemistry, Durham University, Durham DH1 3LE, UK

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, and

K. Prassides

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

E-mail Address: k.prassides@wpi-aimr.tohoku.ac.jp

Corresponding author.

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https://doi.org/10.1142/S0217979218400209Cited by:7 (Source: Crossref)

This article is part of the issue:

SPECIAL ISSUE — Electron Correlation in Superconductivity and Nanostructures; Guest Editor: Sergei Kruchinin

Abstract

The ternary fulleride, Rb $_{0.25}$ $_{0.25}$ Cs $_{2.75}$ $_{2.75}$ C $_{60}$ $_{60}$ , 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, Rb $_{0.25}$ $_{0.25}$ Cs $_{2.75}$ $_{2.75}$ C $_{60}$ $_{60}$ 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 $\sim$ $\sim$ 50 K — evident in the evolution of the magnetic susceptibility with temperature — is accompanied by a lattice collapse, $Δ$ $Δ$ V/V₀ of $- 0.5 %$ $- 0.5 %$ . Bulk superconductivity then emerges on further cooling with a T $_{c}$ $_{c}$ of 25.9 K. The results permit the extension of the electronic phase diagram of A₃C $_{60}$ $_{60}$ fullerides as close as possible to the metal–insulator (M–I) crossover.

Keywords:

PACS: 74.70.Wz, 71.30.+h, 74.62.Fj

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