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  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The P-T magnetic phase diagram of SmMn2Ge2 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4237-4239 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SmMn2Ge2 shows reentrant ferromagnetism. Using flux grown single crystals we find that on cooling through the Curie temperature (Tt1=350 K) the material becomes ferromagnetic (FM). Upon further cooling, at Tt2=150 K an antiferromagnetic (AFM) phase is reached which is stable until Tt3=100 K when there is a transition to FM. The transitions at Tt1 and Tt2 are first order with a temperature hysteresis of about 4 K. Using ac susceptibility to determine the various transition temperatures as a function of pressure (P) we find that Tt3 rapidly decreases with increasing P and at relatively low pressures falls below our measuring range (90 K). Tt2 increases nearly linearly with P and reaches 330 K and 11 kbar. Tt1, drops slowly with increasing P and at 11 kbar the high temperature FM region ends. An x-ray determination of the lattice parameters (at atm pressure) shows that in the AFM region the a0 lattice parameter is decreased, discontinuously changing at Tt2 and Tt3. The c0 lattice parameter is essentially unchanged going through this transition region. These observations indicate that the magnetic properties of SmMn2Ge2 are very sensitive to interatomic spacing. Measurements with a differential scanning calorimeter show that, on heating, the transition at Tt2 is endothermic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338485
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the induced moment magnetic form factor of a heavy fermion superconductor (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3087-3089 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polarized neutron scattering techniques have been used to study the spatial distribution and temperature dependence of the magnetization induced in a single crystal sample of CeCu2Si2 by a magnetic field of 50 kOe. We find that at 4.2 K (〉Tc), the induced magnetization is predominantly of 4f electronic character. No evidence was found of any change in the magnetic form factor between 300 and 4.2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335168
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic study of carbon chars in the transition range (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2681-2685 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using static techniques, we have measured the susceptibility and magnetization of carbon chars heat treated at temperatures between 1000 and 1500 °C, the so-called "transition range,'' where equivalent information is unavailable by electron spin resonance measurements due to severe line broadening effects. A small increase is observed in the Curie contribution to the susceptibility as a function of heat-treatment temperature, indicating the appearance of unpaired spins possibly associated with structural changes which occur in the transition range. The diamagnetism of these chars increases rapidly with increasing heat-treatment temperature, and a strong temperature dependence appears which is consistent with behavior expected for a two-dimensional gas of charged carriers. The latter can be ascribed to the formation and growth of microcrystalline graphitic regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335903
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    Paper (German National Licenses)
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