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  • 1
    Electronic Resource
    Electronic Resource
    A 3He refrigerated scanning tunneling microscope in high magnetic fields and ultrahigh vacuum (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1475-1478 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a scanning tunneling microscope (STM) designed to operate between 275 mK and room temperature, in magnetic fields up to 14 T and in ultrahigh vacuum (UHV). The system features a compact STM connected to an UHV compatible 3He refrigerator fitting into a bottom loading cryostat with a superconducting magnet. In this configuration, the cryostat is sitting on top of the UHV chamber, resulting in a very short distance between the STM access and the experimental position. It further enables proper thermal anchoring of the entire STM setup, allowing millikelvin temperatures to be reached in true UHV conditions. We achieve a hold time of about 40 h at 275 mK and a turnaround time of 10 h between room and base temperature. We demonstrate atomic resolution and present tunneling spectra obtained at 275 mK on the high-Tc superconductors Bi2Sr2CaCu2O8+δ and YBa2Cu3O7−δ. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150483
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  • 2
    Electronic Resource
    Electronic Resource
    Piezoelectric response of epitaxial Pb(Zr0.2Ti0.8)O3 films measured by scanning tunneling microscopy (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1701-1703 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on scanning tunneling microscopy measurements of the piezoelectric response in ferroelectric heterostructures grown by off-axis rf magnetron sputtering. The samples are composed of a single-crystalline ferroelectric film of Pb(Zr0.2Ti0.8)O3 deposited on a conducting substrate and covered with an ultrathin metallic film of gold. The high quality of the c-axis oriented ferroelectric layer is evidenced by sharp polarization hysteresis loops. By applying a voltage to the bilayer and recording the inverse piezoelectric effect with the scanning tunneling microscope, we demonstrate the ability to measure the phase response as well as the ferroelectric switching. We obtained strain-field plots with a butterfly loop shape, and a quantitative measurement of the longitudinal piezoelectric coefficient (d33). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1309017
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental Thermomechanical Processing of High Si-Steels (up to 6.5%Si) (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 373-376 (Aug. 2001), p. 773-776 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.373-376.773.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    A systematic study of the role of Nd/Ba disorder on the superconducting properties of Nd 1 + x Ba 2 - x Cu 3 O 7 - δ thin films (2001)
    Springer
    The European physical journal 24 (2001), S. 177-187 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.76.Bz High-Tc films – 74.72.Jt Other cuprates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The role of Nd/Ba disorder on the superconducting properties of Nd1+xBa2-xCu3O 7 - δ epitaxial thin films has been systematically studied. The temperature dependence of the ab-plane penetration depth of highly c-axis epitaxial samples having different Nd/Ba composition has been measured by an inverted microstrip resonator technique. Stoichiometric films (x = 0) exhibit a linear penetration depth at low temperature, while Nd-rich films (0 〈 x 〈 0.3) show a T2 law. We find that for low Nd excess it is possible to obtain a reasonable fit of the data in the full temperature range using the d-wave picture, with the assumption that Nd at Ba site plays the role of unitary scattering center. At high concentration, the low temperature data can be instead explained supposing that excess Nd acts as impurity with intermediate strength. The dependence of the critical temperature and of the zero temperature superfluid density on disorder have been also studied. It is found that these two quantities are correlated in a way analogous to what reported for YBCO films and single crystals having Zn, Ni impurities at Cu site. An attempt to explain the results using a s-wave approach, as in the two-gap model, is able to reproduce the data but gives results quantitatively conflicting. On the contrary a self-consistent picture within a d-wave framework can be obtained taking into account the effect of localization and suppression of the order parameter at impurity sites in the case of both low and high impurity content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170005
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence of local structural transition during oxidation process of RBCO epitaxial films using time resolved reflexafs measurements (2002)
    Springer
    The European physical journal 27 (2002), S. 467-472 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.72.Bk Y-based cuprates – 74.76.Bz High-Tc films – 68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc. – 78.70.Dm X-ray absorption spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report results of a time resolved X-ray Absorption Spectroscopy (XAS) experiment on the oxidation process of epitaxial Y1(Nd0.05Ba1.95)Cu3Ox superconducting thin films. For the first time Cu K-edge XAS technique has been used to explore local structural changes around the Cu ions during the oxidation process of a high critical temperature superconducting film. The results show that during the oxygenation of a tetragonal Y1(Nd0.05Ba1.95)Cu3Ox additional local transitions appear in the orthorhombic I phase, which are not linked to long range order transformations as shown by in situ X-ray diffraction experiment. New questions concerning the dynamic microscopic process leading to the oxygenation and eventually to superconductivity of the complex R1+xBa2-xCu3Ox (R = Y or rare earth) compounds arose from these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00179-8
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