Superconducting Phase at 7.7 K in the HgxReO3 Compound with a Hexagonal Bronze Structure

Kenya Ohgushi, Ayako Yamamoto, Yoko Kiuchi, Chandreyee Ganguli, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Hidenori Takagi

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Abstract

We have successfully synthesized a new rhenium-based hexagonal bronze material, HgxReO3, which exhibits superconductivity with the transition temperature Tc=7.7K 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.

Original languageEnglish
Article number017001
JournalPhysical Review Letters
Volume106
Issue number1
DOIs
Publication statusPublished - 2011 Jan 4

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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