Mechanical and thermal properties of uranium intermetallic compounds
作者:S. Yamanaka、K. Yamada、T. Tsuzuki、T. Iguchi、M. Katsura、Y. Hoshino、W. Saiki
DOI:10.1016/s0925-8388(98)00152-2
日期:1998.6
coefficients of the intermetalliccompounds were evaluated from high-temperature X-ray diffraction data. The longitudinal and shear sound velocities of the intermetalliccompounds were markedly different, which enabled us to estimate the elastic properties. The intermetalliccompounds were found to have higher bulk moduli than uranium metal. The values of microhardness of the intermetalliccompounds except UFe
57Fe Mössbauer effect evidence for magnetostriction in UFe2
作者:T.K. McGuire、R.H. Herber
DOI:10.1016/0038-1098(83)90749-4
日期:1983.10
Abstract Temperature dependent 57FeMossbauer experiments on UFe2 have shown that above Tc (158 K) the logarithm of the reoil-free fraction is a linear function of temperature, with θM = 325 K. Below Tc there is a non-linear increase in z.hsl which is interpreted in terms of a reduction in the mean square amplitude of the iron atom motion associated with magnetostriction of the unit cell.
X-ray magnetic circular dichroism at the U<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">M</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>,</mml:mo><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>absorption edges of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
We present an x-ray magnetic circular dichroism study performed at the U M(4,5) edges on UFe2, a ferromagnet with almost itinerant 5f electrons. The analysis of the branching ratio of the U M(4,5) edges confirms the fact that the occupation number of the 5f states in UFe2 is lower than in other compounds where the f electrons are more localized. Magnetic circular dichroism effects are observed consistently with the presence of an orbital 5f magnetic moment which aligns parallel to the total magnetic moment. In agreement with a polarized neutron study, we find a nearly perfect cancellation of the U-5f spin and orbital magnetic moments, which results in a vanishing small total U-5f magnetic moment. Results are discussed in comparison with atomic multiplet calculations.
Magnetostriction study of a U0.8Lu0.2Fe2 single crystal