Evolution of a Novel Ribbon Phase in Optimally Doped Bi 2 Sr 2 CaCu 2 O 8+δ at High Pressure and Its Implication to High- T C Superconductivity.

Autor:	Zhang J; Center for High-Pressure Science & Technology Advanced Research , Beijing , 100094 , People's Republic of China., Ding Y; Center for High-Pressure Science & Technology Advanced Research , Beijing , 100094 , People's Republic of China., Chen CC; Department of Physics , University of Alabama at Birmingham , Birmingham , Alabama 35294 , United States., Cai Z; Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States., Chang J; College of Physics and Information Technology , Shaanxi Normal University , Xi'an 710119 , People's Republic of China., Chen B; Center for High-Pressure Science & Technology Advanced Research , Beijing , 100094 , People's Republic of China., Hong X; Center for High-Pressure Science & Technology Advanced Research , Beijing , 100094 , People's Republic of China., Fluerasu A; National Synchrotron Light Source II , Brookhaven National Laboratory , Upton , New York 11973 , United States., Zhang Y; National Synchrotron Light Source II , Brookhaven National Laboratory , Upton , New York 11973 , United States., Ku CS; National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan., Brewe D; Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States., Heald S; Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States., Ishii H; National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan., Hiraoka N; National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan., Tsuei KD; National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan., Liu W; Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States., Zhang Z; Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States., Cai YQ; National Synchrotron Light Source II , Brookhaven National Laboratory , Upton , New York 11973 , United States., Gu G; Condensed Matter Physics and Materials Science Department , Brookhaven National Laboratory , Upton , New York 11973 , United States., Irifune T; Geodynamics Research Center , Ehime University , 2-5 Bunkyo-cho , Matsuyama 790-8577 , Japan.; Earth-Life Science Institute , Tokyo Institute of Technology , Tokyo 152-8500 , Japan., Mao HK; Center for High-Pressure Science & Technology Advanced Research , Beijing , 100094 , People's Republic of China.; Geophysical Laboratory , Carnegie Institution of Washington , Washington, D.C. 20015 , United States.
Jazyk:	angličtina
Zdroj:	The journal of physical chemistry letters [J Phys Chem Lett] 2018 Aug 02; Vol. 9 (15), pp. 4182-4188. Date of Electronic Publication: 2018 Jul 13.
DOI:	10.1021/acs.jpclett.8b01849
Abstrakt:	One challenge in studying high-temperature superconductivity (HTSC) stems from a lack of direct experimental evidence linking lattice inhomogeneity and superconductivity. Here, we apply synchrotron hard X-ray nanoimaging and small-angle scattering to reveal a novel micron-scaled ribbon phase in optimally doped Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212, with δ = 0.1). The morphology of the ribbon-like phase evolves simultaneously with the dome-shaped T C behavior under pressure. X-ray absorption studies show that the increasing of T C is associated with oxygen-hole redistribution in the CuO 2 plan, while T C starts to decrease with pressure when oxygen holes become immobile. Additional X-ray irradiation experiments reveal that nanoscaled short-range ordering of oxygen vacancies could further lower T C , which indicates that the optimal T C is affected not only by an optimal morphology of the ribbon phase, but also an optimal distribution of oxygen vacancies. Our studies thereby provide for the first time compelling experimental evidence correlating the T C  with micron to nanoscale inhomogeneity.
Databáze:	MEDLINE
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