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  • 1
    Electronic Resource
    Electronic Resource
    Competition between ferromagnetic metallic and paramagnetic insulating phases in manganites (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1406-1410 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: La0.67Ca0.33Mn1−xCuxO3 (x=0 and 0.15) epitaxial thin films were grown on the (100) LaAlO3 substrates, and the temperature dependence of their resistivity was measured in magnetic fields up to 12 T by a four-probe technique. We found that the competition between the ferromagnetic metallic (FM) and paramagnetic insulating (PI) phases plays an important role in the observed colossal magnetoresistance (CMR) effect. Based on a scenario that the doped manganites approximately consist of phase-separated FM and PI regions, a simple phenomenological model was proposed to describe the CMR effect. Using this model, we calculated the resistivity as functions of temperature and magnetic field. The model not only qualitatively accounts for some main features related to the CMR effect, but also quantitatively agrees with the experimental observations. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1490153
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  • 2
    Electronic Resource
    Electronic Resource
    Transport properties of La 1 - x Ca x MnO 3 ( 0.5 ? x 〈 1) (2002)
    Springer
    The European physical journal 26 (2002), S. 467-471 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 72.20.Ht High-field and nonlinear effects – 72.60.+g Mixed conductivity and conductivity transitions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The transport properties of the La1-xCaxMnO3 ( 0.5 ? x 〈 1) system in magnetic fields up to 14 T were studied. We found that the relationship between the charge ordering temperature T CO and Mn4+ content n Mn4 + obeys the formula T CO / T max = 1 - a ( n Mn4 + - n 0 ) 2 , here n0 and a are constants and T max is the maximum of T CO . For x = 0.65, T CO arrives at the maximum value of 249.5 K in zero magnetic field, while the charge ordered (CO) state is most stable around x = 0.75. For x = 0.5 when H 〈 6 T the resistivity displays Mott's variable-range hopping (VRH) behavior, when 6 〈 H 〈 12 T it is suggested that two kinds of conduction mechanism, i.e., VRH and magnetic polarons, coexist in the material, and when H 〉 12 T the resistivity shows metallic-like behavior and the transport mechanism is attributed to coexistence of magnetic polarons and free carriers. For x = 0.95, the conduction mechanism accords with the coexistence of VRH and magnetic polarons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020115
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  • 3
    Electronic Resource
    Electronic Resource
    Thermoviscoelastic finite element stress analysis by using endochronic approach
    Amsterdam : Elsevier
    Thermochimica Acta 135 (1988), S. 199-205 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(88)87386-6
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  • 4
    Electronic Resource
    Electronic Resource
    Insulator-metal transition shift related to magnetic polarons in La 0.67- xY xCa 0.33MnO 3 (2003)
    Springer
    The European physical journal 32 (2003), S. 5-11 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.30.Vn Colossal magnetoresistance – 71.30.+h Metal-insulator transitions and other electronic transitions – 76.30.-v Electron paramagnetic resonance and relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic transport properties have been measured for La0.67-xYxCa0.33MnO3 ( 0 ⩽ x ⩽ 0.14) system. It was found that the transition temperature T p almost linearly moves to higher temperature as H increases. Electron spin resonance confirms that above T p , there exist ferromagnetic clusters. From the magnetic polaron point of view, the shift of T p vs. H was understood, and it was estimated that the size of the magnetic polaron is of 9.7 ∼ 15.4 Å which is consistent with the magnetic correlation length revealed by the small-angle neutron-scattering technique. The transport properties at temperatures higher than T p conform to the variable-range hopping mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00068-8
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