Structural and electronic response of overexpanded superconducting fullerides close to the Mott insulator boundary
Küçük Resim Yok
Tarih
2018
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
World Scientific Publ Co Pte Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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 similar to 50 K - evident in the evolution of the magnetic susceptibility with temperature - is accompanied by a lattice collapse, Delta V/V-0 of 0 : 5%. Bulk superconductivity then emerges on further cooling with a T-c of 25.9 K. The results permit the extension of the electronic phase diagram of A(3)C(60) fullerides as close as possible to the metal-insulator (M-I) crossover.
Açıklama
International Conference on Electron Correlation in Superconductors in Nanostructures (ECSN) -- AUG 17-20, 2017 -- Odessa, UKRAINE
Anahtar Kelimeler
Superconductivity, strong correlations, Mott insulator, insulator-metal transition, electronic phase diagram
Kaynak
International Journal Of Modern Physics B
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
32
Sayı
17
