2019/12/31 by Peter Jeglič, Takehito Nakano, Tadej Mežnaršič +2
Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Alkali metal #Chemical and Physical Properties of Materials #Density of states #Fermi level #Ground state #Metal #Particle (ecology) #Rubidium #Zeolite #Zeolite Catalysis and Synthesis #cond-mat.str-el
paper · pdf · doi:10.7566/jpsj.89.073706
published as J. Phys. Soc. Jpn. 89, 073706 (2020) · Extended version showing new data, 4+epsilon pages, 4 figures
arxiv created 2020/05/11 · openalex publication_date 2020/06/18 · arxiv updated 2020/06/19 · openalex created_date 2020/06/25 · openalex updated_date 2026/08/05
The ground state of alkali metals when the particle size decreases from bulk to nanometric atomic clusters is inevitably accompanied by quantum effects that can suppress their pristine metallic state. We demonstrate that the metallic nature of rubidium clusters confined and arrayed in the framework of insulating low-silica X zeolite is preserved. The 87Rb NMR spin-lattice relaxation assigned to rubidium clusters in supercages shows a Korringa behavior from 190~K down to 10~K, which is compatible with a macroscopic observation of low electrical resistivity. The density of states at the Fermi level is found to be enhanced compared to the analogous sodium case, consistent with a Holstein-Hubbard model of alkali-loaded zeolites.