title: Superconducting phase at 7.7 K in the HgxReO3 compound with a hexagonal bronze structure.
abstract: We have successfully synthesized a new rhenium-based hexagonal bronze material, HgxReO3, which exhibits superconductivity with the transition temperature Tc=7.7 K at ambient pressure and 11.1 K at 4 GPa. This compound is a superconductor with the highest Tc among hexagonal bronzes. Moreover, it presents the novel crystallographic feature that (Hg2)2+ polycations, in contrast to monatomic cations in known hexagonal bronzes, are incorporated into open channels. There is evidence that conducting electrons tightly couple with Hg-related phonons. Our results inspire detailed studies on the role of the rattling phonon in the occurrence of superconductivity in the hexagonal bronzes.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
authors.forename: Kenya
authors.initials: K
authors.lastname: Ohgushi
authors.forename: Ayako
authors.initials: A
authors.lastname: Yamamoto
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kiuchi
authors.forename: Chandreyee
authors.initials: C
authors.lastname: Ganguli
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Matsubayashi
authors.forename: Yoshiya
authors.initials: Y
authors.lastname: Uwatoko
authors.forename: Hidenori
authors.initials: H
authors.lastname: Takagi