hamon
Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
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Volume 15, Issue 4
Displaying 1-4 of 4 articles from this issue
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  • Neutron and X-ray Scattering Studies of Relaxor Ferroelectrics
    Kazuma HIROTA
    2005 Volume 15 Issue 4 Pages 222-227
    Published: October 20, 2005
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.15.222
    JOURNAL FREE ACCESS
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    A review is given on recent neutron and x-ray scattering studies of relaxor ferroelectrics, particularly the prototypical relaxor perovskite compounds Pb (Mg1/3Nb2/3) O3, Pb (Zn1/3Nb2/3) O3 and their solid solutions with PbTiO3.
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  • Orbital Ordering in A-site-ordered Perovskite Manganites
    Taka-hisa ARIMA
    2005 Volume 15 Issue 4 Pages 228-231
    Published: October 20, 2005
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.15.228
    JOURNAL FREE ACCESS
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    Neutron powder diffraction measurements were carried out in A-site ordered perovskite manganese oxides TbBaMn2O6 and NdBaMn2O6. Analysis of magnetic reflections in TbBaMn2O6 shows that the magnetic structure is characterized by two kinds of magnetic modulation vectors, (1/2 0 1/4) and (1/4 1/4 1/4), in the primitive cubic setting. The most possible arrangement of spin, charge, and orbital degrees of freedom was proposed. In NdBaMn2O6, the so-called A-type antiferromagnetic structure was observed below-280K. Change of the lattice constants below TN strongly indicates that the A-type AFM was accompanied by x2-y2-type orbital ordering.
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  • Modulated Quadrupolar Structures in Rare-earth Compound PrPb3
    Takahiro Onimaru, Toshiro Sakakibara
    2005 Volume 15 Issue 4 Pages 232-235
    Published: October 20, 2005
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.15.232
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    In the rare-earth compound PrPb3, it was proposed that antiferroquadrupolar (AFQ) ordering occurs at TQ=0.4K only by means of macroscopic measurements. Recently, we have performed neutron diffraction measurements in a magnetic field to confirm the existence of the AFQ ordered state. In magnetic fields applied along the [001] axis, antiferromagnetic components with q=(1/2±δ1/2 0), (1/2 1/2±±0)(±-1/8) are observed below TQ (0.4K at H=0) whose amplitudes vary linear with H and vanish at zero field, providing the first evidence for a modulated quadrupolar phase. For H<1, a nonsquare modulated state persists even below 100 mK, suggesting quadrupole moments associated with a Γ3 doublet ground state to be partially quenched by hybridization with conduction electrons.
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  • Competition between Hidden Order and Inhomogeneous Magnetism in URu2Si2
    Makoto Yokoyama, Hiroshi Amitsuka
    2005 Volume 15 Issue 4 Pages 236-239
    Published: October 20, 2005
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.15.236
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    We show the results of recent microscopic investigations for hydrostatic-pressure, uniaxial-stress and Rh-substitution effects on the hidden order and antiferromagnetic phases in URu2Si2. On the basis of these results, we discuss the nature of the unusual two-phase competition, and suggest a quadrupolar order as a candidate for the hidden order.
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