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  • 1
    Electronic Resource
    Electronic Resource
    Effect of oxygen stoichiometry on properties of La0.815Sr0.185MnO3+d (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5031-5033 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of oxygen stoichiometry on properties of La0.815Sr0.185MnO3+d was studied for samples with oxygen content controlled by quenching from high temperatures (700–1400 °C) in air, cooling under low oxygen partial pressure, and annealing at high oxygen pressure. The oxygen content determined from thermogravimetric analysis was found to vary within a range of 3.00–3.10. At room temperature the lattice parameters of the rhombohedral structure (R3¯c) decrease linearly with increasing oxygen content. The rhombohedral-orthorhombic structural transition temperature decreases abruptly with increasing oxygen content while the Curie temperature increases with increasing oxygen content, reaching a maximum at d∼0.04, and then decreases. The saturation magnetization decreases linearly with increasing oxygen content indicating increasing Mn4+ concentration, i.e., hole doping by cation vacancies. Finally the magnetoresistance effect decreases with increasing d. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373238
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetostriction study of structural and magnetic transitions in La1−xSrxMnO3 (0.1〈x〈0.2) (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3011-3017 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetostriction measurements were performed for stoichiometric La1−xSrxMnO3 samples with x=0.11, 0.13, and 0.165 in magnetic fields to 12 T. By combining temperature and magnetic field dependent magnetostriction data with magnetization and resistivity results, the complex relationship between structural and physical properties was clarified. In the paramagnetic phase, large magnetic fields suppress a transition near x=0.13 from a structure with disordered Jahn–Teller (JT) orbital ordering (O*) to a structure with large coherent JT orbital ordering (O′), and near x=0.165 remove a transition from a structure with no coherent JT orbital ordering (R) to O*. The reentrant structural transition from O′ to O* appears between ferromagnetic and spin–canting transitions for x=0.11 and 0.13; temperatures of all transitions increase with magnetic field. The low temperature structural O* to O′ transition in the ferromagnetic phase for x=0.165 remains unchanged by application of an external magnetic field. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372292
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  • 3
    Electronic Resource
    Electronic Resource
    Muon-spin rotation study of the magnetic correlations in La2−xCa1+xCu2O6+d superconductors (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5558-5560 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Muon spin rotation experiments performed on a series of La2−xCa1+xCu2O6 (x=0.12, 0.16, 0.22) superconductors indicate the existence of the magnetic correlations in the superconducting phase below T∼6 K. The increase in sample inhomogeneity strengthens these correlations. For the superconducting phase, the extrapolated σ(0) values fulfill the universal Uemura relation between Tc and σ(0). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373403
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  • 4
    Electronic Resource
    Electronic Resource
    Enhancement of the low-field magnetoresistance of La1−x−yCaxSryMnO3+d at room temperature (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1271-1274 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied magnetoresistance of a series of La1−x−yCaxSryMnO3+d samples with the Curie temperature (TC) close to room temperature. For these samples, the rhombohedral–orthorombic structural phase transformation temperature (Ts) is slightly higher than TC. On cooling in zero magnetic field, we observe a rapid increase of resistivity at Ts. This increase is followed by a rapid decrease due to the ferromagnetic transition. The applied magnetic field significantly shifts the ferromagnetic transition to higher temperatures and suppresses the structure-related resistivity increase. We show that a combination of these two effects leads to an enhancement of the negative magnetoresistance due to strong spin-lattice coupling. Furthermore, by annealing the samples at appropriate temperatures in air, the enhancement can be optimized to appear in relatively low magnetic fields and at room temperature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1328060
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  • 5
    Electronic Resource
    Electronic Resource
    First-order antiferromagnetic and structural transition in Sr-rich Pr1−xSrxMnO3 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7407-7409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present magnetization and resistivity data on polycrystalline samples of Pr1−xSrxMnO3 (0.58≤x≤1.00). All the samples are antiferromagnetic insulators at low temperatures. For 0.78〈x〈0.90, and for x=0.58, both resistivity and magnetization show a clear hysteresis which indicates the first-order nature of the antiferromagnetic transition. Neutron diffraction data show that the paramagnetic-to-antiferromagnetic transition is accompanied by a cubic-to-tetragonal structural transition for 0.78〈x〈0.90, and tetragonal-to-orthorombic transition for x=0.58. The other samples exhibit continuous transitions to the antiferromagnetic state. Our results show that the structural transitions are the origin of the discontinuous magnetic and resistive transitions. A moderate magnetoresistance effect can be observed for a lower Sr content possibly due to ferromagnetic fluctuations. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358343
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  • 6
    Electronic Resource
    Electronic Resource
    Crystal Chemistry of Ln'Ln''Ba2Cu2Ti2O11 (Ln = Lanthanide, Y) Materials (1995)
    s.l. : American Chemical Society
    Chemistry of materials 7 (1995), S. 1355-1360 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00055a013
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal-field excitations and superconductivity in Nd1+xBa2−xCu3O7 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4536-4538 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The f-electron excitation spectra of Nd ions in superconducting NdBa2Cu3O7 and semiconducting Nd1.5Ba1.5Cu3O7 have been determined by inelastic neutron scattering. Transitions within the paramagnetic ground-state multiplet due to crystal-field splittings have been observed up to about 120 meV in these materials. The temperature dependence of the width of the low-lying transition at ∼21 meV shows significant differences in the superconducting and normal states. Adopting the CF level assignments for HoBa2Cu3O7, we rescaled the CF parameters to account for the larger radial wave functions of Nd3+ ions and obtained a level scheme for the Nd using the lowest 100 states of the f3 configuration. The calculated level structures for REBa2Cu3O7 (RE=Nd, Pr, Ho) are in good agreement with neutron and susceptibility measurements. Influence of superconducting ordering on crystal-field transitions in the Nd1+xBa2−xCu3O7 system is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344860
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of high-density Ba1−xKxBiO3 superconducting samples (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1585-1587 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A synthesis procedure for producing high-density Ba1−xKxBiO3 has been developed. A novel melt-processing technique is described which yields strong, near 100% dense superconducting material. This material is much more amenable to experimental study than the powder samples produced by the previous synthesis methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101388
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation of Bi-Sr-Ca-Cu-O superconductors from oxide-glass precursors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 423-425 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter we report on efforts to synthesize the new Ca-Sr-Bi-Cu-O superconductors from amorphous glasses. These glasses are produced by quenching melts of the constituent oxides, followed by firing to produce the superconducting phase. This synthetic route produces denser, more uniform samples than those obtained from firing intimate mixtures of the constituent binary oxides and carbonates. Ultimately, this technique may yield pure materials with enhanced bulk properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100609
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  • 10
    Electronic Resource
    Electronic Resource
    Highly textured thick films by a melt-annealing technique in the Bi-Sr-Ca-Cu-O system (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2236-2238 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A melt-annealing method has been developed to deposit highly textured superconducting thick films on different substrates in the Bi-Sr-Ca-Cu-O system. As opposed to previous techniques, this method uses powder made from an extremely dense glass sample to yield very uniform and dense thick films. The x-ray diffraction and scanning electron microscopy results indicate that the superconducting phase is strongly oriented along the c axis perpendicular to the substrate and the films are chemically uniform. Electrical transport measurements consistently show a Tc near 80 K for all samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102356
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