1 research outputs found
Influence of oxygen-coordination number on the electronic structure of single-layer La-based cuprates
We present an angle-resolved photoemission spectroscopy study of the
single-layer T*-type structured cuprate SmLaSrCuO with unique
five-fold pyramidal oxygen coordination. Upon varying oxygen content,
T*-SmLaSrCuO evolved from a Mott-insulating to a metallic state
where the Luttinger sum rule breaks down under the assumption of a large
hole-like Fermi surface. This is in contrast with the known doping evolution of
the structural isomer LaSrCuO with six-fold octahedral
coordination. In addition, quantitatively characterized Fermi surface suggests
that the empirical rule for octahedral oxygen-coordination
systems does not apply to T*-SmLaSrCuO. The present results
highlight unique properties of the T*-type cuprates possibly rooted in its
oxygen coordination, and necessitate thorough investigation with careful
evaluation of disorder effects.Comment: Accepted for publication in Phys. Rev.