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Pregled bibliografske jedinice broj: 855

Molecular Beam Epitaxy And Microstructural Study Of La2-Xsr1+Xcu2o6+Y Thin Films


Verbist, Karen; Milat, Ognjen; Van Tendeloo, Gustaaf; Arrouy, Francois; Williams, E.J.; Rossel, C.; Machler, E.; Locquet, Jean Pierre
Molecular Beam Epitaxy And Microstructural Study Of La2-Xsr1+Xcu2o6+Y Thin Films // Physical review B : condensed matter, 56 (1997), 2; 853-861 (međunarodna recenzija, članak, znanstveni)


Naslov
Molecular Beam Epitaxy And Microstructural Study Of La2-Xsr1+Xcu2o6+Y Thin Films

Autori
Verbist, Karen ; Milat, Ognjen ; Van Tendeloo, Gustaaf ; Arrouy, Francois ; Williams, E.J. ; Rossel, C. ; Machler, E. ; Locquet, Jean Pierre

Izvornik
Physical review B : condensed matter (0163-1829) 56 (1997), 2; 853-861

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Copper oxides; superconducting films; transport properties; structural disorder; growth; perovskite; Yba2cu3o7-delta; deposition; oxidation system

Sažetak
Thin films of La2SrCu2O6+y with varying Sr/La ratios have been grown by: molecular beam epitaxy on (001) SrTiO3; their structural as well as their transport properties are reported. Under appropriate conditions, thin films with a metal-like resistivity down to 8 K are obtained; i.e., these films are closer to the onset of superconductivity than previous results indicate for bulk samples. This observation might be explained by a: thin-film-specific alteration in site occupation of the La and Sr atoms in the lattice. In addition, the defect structures of a typical sample have been studied by transmission electron microscopy and the thin-film/substrate interface structure is determined. Out-of-phase boundaries with displacement vectors R = [00 1/5] occur throughout the entire film thickness. Such interfaces, which possibly originate at substrate surface steps, disconnect the CuO2 layers and negatively influence eventual superconductivity. The films;contain copper oxide outgrowths and nano-sized a-axis grains at the surface. Locally a 2 root 2a(p) x 2 root 2a(p) modulation is observed; we have determined its unit cell and compared it with other so-called 2 root 2a(p) x 2 root 2a(p) structures occurring in other superconducting compounds such as YBa2Cu3O7-d and Bi1.8Pb0.4Sr2Ca2Cu3O10+x.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
00350105

Ustanove
Institut za fiziku, Zagreb

Autor s matičnim brojem:
Ognjen Milat, (77950)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus