巻号一覧
15 巻 (2005)
- 4 号 p. 222-
- 3 号 p. 178-
- 2 号 p. 144-
- 1 号 p. 2-
15 巻, 4 号
選択された号の論文の4件中1～4を表示しています
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廣田 和馬2005 年 15 巻 4 号 p. 222-227
発行日: 2005/10/20
公開日: 2011/01/27
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (4195K) -
有馬 孝尚2005 年 15 巻 4 号 p. 228-231
発行日: 2005/10/20
公開日: 2011/01/27
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (4613K) -
鬼丸 孝博, 榊原 俊郎2005 年 15 巻 4 号 p. 232-235
発行日: 2005/10/20
公開日: 2011/01/27
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (4550K) -
横山 淳, 網塚 浩2005 年 15 巻 4 号 p. 236-239
発行日: 2005/10/20
公開日: 2011/01/27
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (4176K)
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