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  • 2000-2004  (3)
  • 1995-1999  (8)
  • 1975-1979  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Interfacial roughness of Fe–Cr GMR superlattices (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6253-6253 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe–Cr superlattices exhibit giant magnetoresistance effect which can be utilized in magnetic recording heads. There are many studies indicating the role of the interfacial structure on the magnetoresistance effect. To elucidate this point we have performed x-ray diffraction study of three [Fe(30 A(ring))/Cr(12 A(ring))]10 superlattices which had been sputtered in 4, 7, and 10 mTorr of Ar. We used position sensitive detector in horizontal setup to collect simultaneously specular scattering intensity (z component of the scattering vector Q perpendicular to the film) and off-specular intensity with y parallel to the plane of the sample. This technique allows to evaluate interfacial roughness at various length scales. Short range roughness may be due to interdiffusion, while some medium range roughness is also present, and could have effects on transport phenomena. In conventional low angle diffraction analysis these contributions are intermixed. From the Fourier transform of the scattered intensity distribution in Qx−Qy plane the interfacial height fluctuation function g(r)can be obtained (r is a lateral spacing). Figure 1 presents g(r) obtained for three samples of Fe–Cr. It is apparent that 4 mTorr sample is very different than 7 and 10 mTorr in terms of interfacial roughness. We will discuss in detail results of the diffraction studies together with the magnetization and magnetotransport data. ©1996 American Institute of Physics. [S0021-8979(96)61408-0]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362022
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of local lattice distortions in La1−xSrxMnO3 provided by pulsed neutron diffraction : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5484-5486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pulsed neutron powder diffraction study of La1−xSrxMnO3 reveals that the local atomic structure is significantly different from the long range structure, and these differences are important in understanding their properties. Even though the crystal structure suggests that the Jahn–Teller (JT) distortion disappears quickly with Sr doping, the analysis by the pair distribution function technique indicates that locally JT distortions are always present. Doped charge carriers induce local anti-JT distortions and disrupt the long range JT distortion. In the paramagnetic phase, such anti-JT distortions are represented by Mn4+ ions, corresponding to small polarons. Below Tc charge carriers are delocalized, but still induce local lattice distortions, giving rise to an inhomogeneous metallic state. The effects of these local distortions are discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364595
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic Properties of Amorphous Alloys (1978)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 8 (1978), S. 423-457 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.08.080178.002231
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  • 4
    Electronic Resource
    Electronic Resource
    Atomic Structure of PbZrO3 Determined by Pulsed Neutron Diffraction (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 750-765 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The atomic structure of lead zirconate, PbZrO3 (PZ), was studied using Rietveld refinement and atomic pair distribution function analysis of pulsed neutron powder diffraction data for the antiferroelectric, intermediate and paraelectric phases. The symmetry of PZ at T = 20 K in the antiferroelectric phase was determined to be Pbam. The structure was characterized by distortions of the ZrO6 octahedra which are smaller than in previous studies. Locally correlated displacements of Pb in the c direction develop with increasing temperature. The average magnitude was 0.06 Å at room temperature, 0.14 Å at T = 473 K and 0.20 Å in the intermediate phase at T = 508 K. The intermediate phase was characterized by in-plane antiferroelectric Pb displacements which produce 1\over 2{110} superlattice diffraction peaks. Above 473 K the local structure of PZ remains largely unchanged, in spite of the transitions in the long-range order from the antiferroelectric to the intermediate and to the paraelectric phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768198003802
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  • 5
    Electronic Resource
    Electronic Resource
    The reaction of ethylene on a model automotive emissions control catalyst (1999)
    Springer
    Catalysis letters 61 (1999), S. 33-38 
    Details
    ISSN: 1572-879X
    Keywords: ceria ; emissions control ; Rh ; ethylene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction of ethylene on a model automotive emissions control catalyst consisting of Rh particles on an epitaxial ceria film grown on the (100) surface of an yttria‐stabilized zirconia single crystal was studied using TPD. The TPD results showed that ethylene undergoes dehydrogenation on the model catalyst at temperatures below 500 K depositing carbon on the Rh particles. Surface carbon formed in this manner was oxidized to CO upon heating to above 550 K using oxygen supplied by the ceria lattice. Heating to 900 K was found to induce reduction of the ceria film resulting in a marked decrease in oxidation activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019012619924
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  • 6
    Electronic Resource
    Electronic Resource
    High Resolution TOF Neutron Powder Diffractometer with Supermirror Guide (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 321-324 (Jan. 2000), p. 302-307 
    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/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.321-324.302.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Electron-Lattice Coupling in Manganites and Cuprates (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 23-26 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The lattice effects of charge localization in manganites and cuprates arediscussed from the local structural point of view. Pulsed neutron atomicpair-density function (PDF) analysis indicates that in La1−x Sr x MnO3 the realstructure deviates from the average crystal structure, and the localJahn–Teller (JT) distortion of Mn3+O6 octahedra remains even in themetallic phase. This leads to a concept of the critical ionic size factorfor the formation of JT polarons. The colossal magnetoresistance (CMR)phenomena are observed in the crossover region from localized to delocalizedcharge states. This concept also explains the asymmetry of the phase diagramwhich is difficult to understand in the current band picture. Similarconsideration may help understand the lattice effects in superconductingcuprates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007701015301
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  • 8
    Electronic Resource
    Electronic Resource
    Lattice Effects on Charge Localization in Cuprates (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 709-712 
    Details
    ISSN: 1572-9605
    Keywords: neutron scattering ; phonons ; polarons ; cuprates ; CMR manganites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Recent experimental results on cuprates and manganites, including those of elastic and inelastic neutron scattering measurements, suggest that charges are not homogeneously distributed even in the metallic state in these compounds. Charge inhomogeneity results from spin/lattice charge constriction. In cuprates the LO phonons strongly reflect the temperature- and composition-dependent charge inhomogeneity and may possibly be involved in causing it. Unlike the static stripes that compete against superconductivity, the charge inhomogeneity seen by the LO phonons is markedly increased in the superconducting phase. A new mechanism of high-temperature superconductivity involving lattice/spin charge constriction is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007849811903
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  • 9
    Electronic Resource
    Electronic Resource
    Structural relaxation in amorphous Fe40Ni40P14 B6 studied by energy dispersive X-ray diffraction (1978)
    Springer
    Journal of materials science 13 (1978), S. 2587-2599 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The atomic structure and the structural relaxation of amorphous Fe40Ni40P14B6 alloy were studied using the energy dispersive X-ray diffraction method. It was demonstrated that the structure of the amorphous alloy can be determined self-consistently with high accuracy by this method. The results indicated that the structural relaxation is a highly collective process involving many atoms, and can be described in terms of the redistribution and transformation of the structural defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552688
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  • 10
    Electronic Resource
    Electronic Resource
    Electron-lattice interaction in cuprates (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 791-800 
    Details
    ISSN: 1573-7357
    Keywords: 61.12.−q ; 74.20.Mn ; 74.72.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental studies of local structure by pulsed neutron PDF analysis on manganites and cuprates suggest that these oxides are locally distorted due to a strong electron-lattice interaction, and charge carriers organize themselves most likely into a tweed-like state. Measurements by inelastic neutron scattering as well as calculations on the Hubbard model show that the electron-lattice interaction is strongest at the zone boundaries, enhanced by phonon-induced spin-correlations. Such a strong electron-lattice interaction must be the origin of these local distortions, and may form the basis for the microscopic mechanism of superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768480
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