High-resolution electron microscopy of the c=30.5 Ã… and c=38.2 Ã… polytypoids in the Bi-Ca-Sr-Cu-O superconductor

Hetherington, C. J. D.; Ramesh, R.; O’Keefe, M. A.; Kilaas, R.; Thomas, G.; Green, S. M.; Luo, H. L.
September 1988
Applied Physics Letters;9/12/1988, Vol. 53 Issue 11, p1016
Academic Journal
We report results of high-resolution structure imaging, image processing, and simulation of the c = 30.5 Ã… (T[sub c] = 80 K) and c = 38.2 Ã… (T[sub c] = 115 K) superconducting polytypoids in the BiCa-Sr-Cu-O system. The increase in c parameter is due to the insertion of two layers of Cu-O perovskite +Ca atoms in each unit cell. From the processed image and simulations, it appears that the central Cu layer in the c = 38.2 Ã… polytypoid may be oxygen deficient. In addition, the image simulation experiments suggest that the oxygen atoms in the Bi-O layers are located at the face center of the Bi lattice.


Related Articles

  • Superconductivity in a layered perovskite without copper. Maeno, Y.; Hashimoto, H. // Nature;12/8/1994, Vol. 372 Issue 6506, p532 

    Describes the superconductivity in a layers perovskite isostructural. Review of related literature; Significance of the presence of copper in layered perovskites; Electronic structure of the compound in study.

  • Development and Characterisation of Ba[sub 2]RENbO[sub 6] (RE = Yb, Er and Ho) and Potential Use as Substrate for Superconducting YBCO Films. Nair, S. U. K.; Warriar, P. R. S.; Koshy, J. // Modern Physics Letters B;10/30/2001, Vol. 15 Issue 25, p1101 

    A group of complex perovskite oxides Ba[sub 2]RENbO[sub 6] (RE = Yb, Er and Ho) have been synthesised and developed for their use as substrate for YBa[sub 2]Cu[sub 3]O[sub 7-δ] superconductors. These materials have a complex cubic perovskite (A[sub 2]BB'O[sub 6]) structure with lattice...

  • A copperless Perovskite superconductor... Schewe, Phillip F. // Physics Today;Feb95, Vol. 48 Issue 2, p9 

    Reports on the discovery of a copperless perovskite superconductor by physicists at IBM Zurich and Hiroshima University. Properties of the perovskite; Question on the mechanism of superconductivity.

  • Magnetic Resonance of Exchange-Coupled Copper Complexes in Perovskite-Structure Crystals: The Potassium Tantalate and Cuprate Superconductors. Baranov, P. G.; Badalyan, A. G.; Azamat, D. V. // Physics of the Solid State;Jan2001, Vol. 43 Issue 1, p98 

    This paper reports on parallel EPR studies of high-temperature superconductors based on the cuprate perovskites RBa[sub 2]Cu[sub 3]O[sub 6 + x] (R = Y, Gd, Nd) and of KTaO[sub 3] : Cu, which also has a perovskite structure. EPR measurements performed on copper-doped KTaO[sub 3] crystals...

  • Substrate Characteristics of Ba[sub 2]HoNbO[sub 6] for the Fabrication of LaBaCaCu[sub 3]O[sub 7-δ] Superconducting Films. Téllez, D. A. Landínez; Aguiar, J. Albino; Yadava, Y. P.; Chavira, E.; Roa-Rojas, J. // Modern Physics Letters B;9/10/2001, Vol. 15 Issue 21, p905 

    We have synthesized and studied the characteristics of Ba[sub 2]HoNbO[sub 6] (BHNO) substrates for the fabrication of LaBaCaCu[sub 3]O[sub 7-δ] (LBCCO) superconducting films. BHNO has an A[sub 2]BB'O[sub 6] complex cubic perovskite structure with lattice constant a = 8,439 Å....

  • Superconducting Bi-cuprate thick film T[sub c(0)]=110 K on DyBa[sub 2]SnO[sub 5.5]: A newly.... Koshy, J.; Kumar, K.S. // Applied Physics Letters;11/28/1994, Vol. 65 Issue 22, p2857 

    Presents the synthesis and development of DyBa[sub 2]SnO[sub 5.5] (DBSO) perovskite substrate and the fabrication of superconducting bismuth (Bi) thick film on the substrate. Use of the dielectric constant and loss factor for microwave application; Compatibility of DBSO with Bi(Pb)-Sr-Ca-CuO...

  • Observation of a halide (F/Cl) stabilized, new perovskite phase in superconducting Y2Ba5Cu7Ox films. Kwo, J.; Hong, M.; Fleming, R. M.; Hebard, A. F.; Mandich, M. L.; DeSantolo, A. M.; Davidson, B. A.; Marsh, P.; Hobbins, N. D. // Applied Physics Letters;5/9/1988, Vol. 52 Issue 19, p1625 

    A new, ordered perovskite structure was stabilized as a majority phase in superconducting Y2Ba5Cu7O20-δ’(F/Cl)δ‘ films epitaxially grown on SrTiO3(100). The new phase was formed via fluorination or chlorination introduced during the post-deposition O2 furnace anneal for...

  • Electronic structure of MgCNi[sub 3-x]TM[sub x] (TM=Cu,Co,Mn). Wang, J. L.; Xu, Y.; Zeng, Z.; Zheng, Q. Q.; Lin, H. Q. // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p8504 

    The effects on the electronic structure and magnetic property of the Ni site substitution in nonoxide perovskite superconductor MgCNi[sub 3] are studied by using density functional calculations. A sharp high peak of Ni d density of states just lies below the Fermi energy in pure MgCNi[sub 3]....

  • Resonant tunneling transport across YBa[sub 2]Cu[sub 3]O[sub 7]-SrRuO[sub 3] interfaces. Domel, Regina; Horstmann, C. // Applied Physics Letters;9/18/1995, Vol. 67 Issue 12, p1775 

    Investigates the transport properties of superconductor-normal metal-superconductor junctions with metallic perovskite barriers. Information on the insulating interface layer dominating the normal resistance; Details on the conductivity of all junctions; Description of the Cooper pair current...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics