title: Suppression of Three-Dimensional Charge Density Wave Ordering via Thickness Control.
abstract: Barium bismuth oxide (BaBiO_{3}) is the end member of two families of high-T_{c} superconductors, i.e., BaPb_{1-x}Bi_{x}O_{3} and Ba_{1-x}K_{x}BiO_{3}. The undoped parent compound is an insulator, exhibiting a charge density wave that is strongly linked to a static breathing distortion in the oxygen sublattice of the perovskite structure. We report a comprehensive spectroscopic and x-ray diffraction study of BaBiO_{3} thin films, showing that the minimum film thickness required to stabilize the breathing distortion and charge density wave is ≈11 unit cells, and that both phenomena are suppressed in thinner films. Our results constitute the first experimental observation of charge density wave suppression in bismuthate compounds without intentionally introducing dopants.
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Gideok
authors.initials: G
authors.lastname: Kim
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Michael
authors.initials: M
authors.lastname: Neumann
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Minu
authors.initials: M
authors.lastname: Kim
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Manh Duc
authors.initials: MD
authors.lastname: Le
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Tae Dong
authors.initials: TD
authors.lastname: Kang
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Tae Won
authors.initials: TW
authors.lastname: Noh