2001/12/31 by Pei Herng Hor, Young Hoon Kim · 1 citation
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Electronic and Structural Properties of Oxides #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/14/43/332
published as J. Phys.: Condens. Matter 14 (2002) 10377-10387 · 11 pages, 6 figures
openalex publication_date 2002/10/18 · arxiv created 2003/03/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We have studied the charge dynamics of Sr-doped La 2 CuO 4 at hole concentration p = 0.07. We observed a clear indication of the competition between two new characteristic collective modes of the Wigner lattice orders suggested earlier: one corresponds to a T c = 15 K superconductivity and the other to T c = 30 K. Our results naturally explain the recent observation of metallic transport in extremely low (1%) Sr-doped La 2 CuO 4 and establish a novel insulator to metal transition mechanism and superconductivity in the two-dimensional Wigner lattice ground state. We suggest that the fluctuations of the relative phase between the superconducting condensate and the Wigner lattice order can provide an answer to the unidentified mode in the c -axis conductivity that appears only below T c .