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  • 1
    Electronic Resource
    Electronic Resource
    Conductivity jumps and low-temperature magnetoresistance in the new semiconducting perovskites La1− x BixMnO3+δ (1996)
    Springer
    JETP letters 64 (1996), S. 274-278 
    Details
    ISSN: 1090-6487
    Keywords: 71.27.+a ; 71.28.+d ; 71.30.+h ; 75.30.Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Abrupt jumps are observed on the temperature dependences of the electrical conductivity of La1− x BixMnO3+δ (0.1〈x〈0.7) and La0.3Bi0.7Na0.1MnO3+δ ceramics. The temperatures at which the jumps take place can be reduced by several degrees by applying an external magnetic field of 15 kOe. It can be seen from the magnetization data that the poorly conducting low-temperature phase is not antiferromagnetic (it is likely ferromagnetic) and hence the real-space charge ordering mechanism is not sufficient for explaining the experimental results. An interpretation in terms of magnetic phase nonuniformity is proposed. All the samples studied exhibit high low-temperature magnetoresistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567183
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  • 2
    Electronic Resource
    Electronic Resource
    New low-frequency magnetic excitations in LaMnO3 single crystals (2000)
    Springer
    Journal of experimental and theoretical physics 90 (2000), S. 474-478 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Microwave magnetic resonance of close to stoichiometric antiferromagnetic LaMnO3 − δ was investigated. LaMnO3 − δ single crystals were grown and a series of samples with a small oxygen excess and deficiency was prepared. Residual magnetization was observed for all samples in the series. The maximum value of the residual magnetic moment in the series of samples obtained was 2.5% of the maximum possible value (4μB for each Mn ion). An absorption line, whose angular and frequency dependences cannot be explained on the basis of a previously proposed [S. Mitsudo, et al., J. Magn. Magn. Mater. 177–181, 877 (1998)] model of two-sublattice antiferromagnet with “easy axis” magnetic anisotropy (∥ b) and canting of the magnetic sublattices due to the Dzyaloshinski $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} $$ -Moriya interaction, was observed in the experiments performed on all samples in a series as well as on specially prepared ceramic samples with the same composition. It was inferred that the low-frequency excitations in a system of ferromagnetic drops observed in [M. Hennion, et al., Phys. Rev. Lett. 81, 1957 (1998)] are observed in the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.559128
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  • 3
    Electronic Resource
    Electronic Resource
    Antiferromagnetic resonance in Bi2CuO4 (1998)
    Springer
    Journal of experimental and theoretical physics 86 (1998), S. 1228-1233 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic resonance of the low-frequency spin-wave branch in the Bi2CuO4 antiferromagnet with an easy-plane anisotropy has been studied. Angular, frequency, and temperature dependences of the position and width of the antiferromagnetic resonance (AFMR) line have been measured. Our measurements combined with earlier data [H. Ochta, K. Yoshida, T. Matsuya, T. Nanba, M. Motokawa, K. Yamada, Y. Endon, and S. Hosoya, J. Phys. Soc. Jpn. 61, 2921 (1992); E. W. Ong, G. H. Kwei, R. A. Robinson, B. L. Ramakrishna, and R. B. von Dreele, Phys. Rev. B 42, 4255 (1990) [ have allowed us to determine anisotropy constants of this material and to account for the unusual character of its static susceptibility anisotropy. The AFMR line shifts to the high-field side and broadens in a temperature range of 10–15 K, and the cause of this has remained unclear. In the low-temperature range the line shows a hysteresis corresponding to a static field magnitude several times as large as the spin-flop field. The position and width of the AFMR line depend sensitively on the sample preparation technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558595
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  • 4
    Electronic Resource
    Electronic Resource
    Structural properties and Mössbauer spectroscopy of the high TcYBa2Cu3−xFexOy compounds (1990)
    Springer
    Hyperfine interactions 61 (1990), S. 1105-1112 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New results on the Mossbauer spectroscopy of the YBa2(Cu1−xFex)3Oy system are reported and the availible reliable experimental data are briefly summarized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407582
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic states of Cu1 sublattice in YBa2Cu3Oy high Tc compounds at different oxygen content (1994)
    Springer
    Hyperfine interactions 93 (1994), S. 1677-1682 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic states of Cu1 sublattice in YBa2Cu3O y : 1%57Fe compounds with 6.09 ≤y≤6.98 were investigated by57Fe Mössbauer spectroscopy at 1.68≤T≤300 K. It has been found that, upon reducingy, the magnetic transition temperatureT ml changes from 3.3 to 12 K aroundy≃6.4 where the superconductivity disappears. The magnetic phase diagram for the Cu1 sublattice is plotted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072927
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  • 6
    Electronic Resource
    Electronic Resource
    A method of calculating the output of vacuum molding machines (1966)
    Springer
    Chemical and petroleum engineering 2 (1966), S. 88-94 
    Details
    ISSN: 1573-8329
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01146325
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    Paper (German National Licenses)
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