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A New Superconducting Phase of Sodium Cobalt Oxide
Author(s) -
Takada K.,
Sakurai H.,
TakayamaMuromachi E.,
Izumi F.,
Dilanian R. A.,
Sasaki T.
Publication year - 2004
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200400756
Subject(s) - superconductivity , materials science , oxide , cobalt , cobalt oxide , stacking , phase (matter) , sodium oxide , layer (electronics) , sodium , inorganic chemistry , nanotechnology , condensed matter physics , crystallography , metallurgy , nuclear magnetic resonance , chemistry , physics , organic chemistry
A new superconducting sodium cobalt oxide (see Figure, left) has been synthesized through soft‐chemical modification using α‐NaCoO 2 as a parent compound, in place of the γ‐Na 0.7 CoO 2 used to make the first cobalt oxide superconductor (see Figure, right). A three‐layer periodicity of the CoO 2 stacking sequence exists in the present material, in contrast to a two‐layer one in the previous. The new oxide has a superconducting transition at 4.6 K.