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Yamauchi, Hiroki; Osakabe, Toyotaka; Kosaka, Masashi*; Matsuoka, Eiichi*; Onodera, Hideya*
Journal of the Korean Physical Society, 62(12), p.2084 - 2087, 2013/06
Times Cited Count:2 Percentile:11.42(Physics, Multidisciplinary)Michimura, Shinji*; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*
Journal of the Physical Society of Japan, 81(4), p.044711_1 - 044711_5, 2012/04
Times Cited Count:4 Percentile:32.96(Physics, Multidisciplinary)Resonant X-ray diffraction experiments on CePdS were performed at the Ce- absorption edge to study the states of quadrupolar ordering below the ferromagnetic transition temperature = 6.3 K. The magnetic structure of CePdS was reported as a canted ferromagnetic structure with a canting angle of 51. It has therefore been pointed out that the complex magnetic structure arises from the simultaneous ordering of quadrupole moments. We observed the azimuthal angle dependence of the diffraction intensity of the two forbidden reflections 003 and 104 reflections for both -' and -' scattering processes. The results revealed that -type antiferroquadrupolar ordering coexists with magnetic ordering. We infer that the magnetic structure of CePdS is not a canted structure but a ferrimagnetic structure and that the quadrupole moment is also a primary-order parameter.
Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*
Journal of the Physical Society of Japan, 81(3), p.034715_1 - 034715_7, 2012/03
Times Cited Count:11 Percentile:57.56(Physics, Multidisciplinary)High-pressure single-crystal neutron diffraction experiments were carried out on a tetragonal HoBC where the antiferroquadrupolar (AFQ) order coexists with the antiferromagnetic (AFM) order competitively. The transition temperature increases monotonically with increasing pressure up to 9.8 GPa, whereas decreases and vanishes at approximately 4 GPa as pressure increases, indicating that applying pressure enhances the AFM interaction and simultaneously suppresses the AFQ order. We presume that the volume shrinkage by applying pressure constrains the local atomic displacement of (B-C) layers and leads to the suppression of the AFQ order. We additionally found pressure-induced phases where the ordered state was considered to be antiferromagnetic.
Inami, Toshiya; Homma, Tetsuo*; Tsutsui, Satoshi*; Indo, Kentaro*; Onodera, Hideya*; Ishii, Kenji; Owada, Kenji; Kuzushita, Kaori*; Nakao, Hironori*; Murakami, Yoichi*
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.748 - 750, 2007/03
We investigated successive phase transitions in SmBC at =37K and =51K by means of resonant X-ray diffraction. Strong resonant diffraction signal is observed at the 101 reflection below at the Sm edge, whereas in the intermediate phase signals appear at incommensurate positions =(1, ,1) where =0.13. Accordingly, the successive phase transitions in SmBC is found to be commensurate-to-incommensurate magnetic phase transitions.
Ido, Kaihei*; Tobo, Aya*; Kaneko, Koji; Oyama, Kenji*; Onodera, Hideya*
Journal of the Physical Society of Japan, 74(12), p.3382 - 3386, 2005/12
Times Cited Count:5 Percentile:37.31(Physics, Multidisciplinary)The field-direction dependence of the magnetic phase diagram was examined for the compound TbBC with field-induced antiferroquadrupolar-ordering, in order to elucidate anisotropy in the magnetic phase diagrams for [100] and [110]. The field-induced phase for [100] (phase III), which is a phase in which antiferromagnetic (AFM) and antiferroquadrupolar (AFQ) orders coexist, seems to change continuously into the other (AFQAFM) phase (phase II') for [110]. The result implies that both III and II' phases have some similarity in their magnetic structures or they are possibly the same as each other.
Kaneko, Koji; Metoki, Naoto; Oyama, Kenji*; Onodera, Hideya*; Yamaguchi, Yasuo*
Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e375 - e376, 2004/05
Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)no abstracts in English
Tanaka, Yoshikazu*; Inami, Toshiya; Lovesey, S. W.*; Knight, K. S.*; Yakhou, F.*; Mannix, D.*; Kokubun, Jun*; Kanazawa, Masayuki*; Ishida, Kotaro*; Nanao, Susumu*; et al.
Physical Review B, 69(2), p.024417_1 - 024417_11, 2004/01
Times Cited Count:36 Percentile:79.6(Materials Science, Multidisciplinary)Direct evidence of the spatial ordering of Dy 4 quadrupole and hexadecapole moments in DyBC is demonstrated by resonant X-ray diffraction enhanced by an electric quadrupole event (2 resonance) at the Dy L absorption edge. The diffraction data show that the structural phase transition at = 24.7 K is accompanied by a reduction in the symmetry of the Dy site to 2/, from 4/, and the spatial ordering of the time-even Dy multipoles with A character. Below the crystal structure is described by the space group 4/ and Dy ions occupy sites (4). The distortion at T involves the lattice occupied by B and C ions, and it amounts to a buckling of B-C planes that are normal to the two-fold rotation axis of 2/. An immediately plausible model of low-energy Dy states correlates data on the specific heat, our X-ray diffraction signals, and magnetic ordering below 15.3 K which has been observed in magnetic neutron diffraction.
Oyama, Kenji*; Kaneko, Koji; Onimaru, Takahiro*; Tobo, Aya*; Ishimoto, Kenichi*; Onodera, Hideya*; Yamaguchi, Yasuo*
Journal of the Physical Society of Japan, 72(12), p.3303 - 3304, 2003/12
Times Cited Count:6 Percentile:43(Physics, Multidisciplinary)no abstracts in English
Tobo, Aya*; Ishimoto, Kenichi*; Konno, Junya*; Oyama, Kenji*; Kaneko, Koji; Yamaguchi, Yasuo*; Onodera, Hideya*
Journal of the Physical Society of Japan, 72(12), p.3231 - 3236, 2003/12
Times Cited Count:1 Percentile:12.86(Physics, Multidisciplinary)no abstracts in English
Michimura, Shinji; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*
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no abstracts in English
Michimura, Shinji; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Onodera, Hideya*
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Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*
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no abstracts in English
Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*
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no abstracts in English
Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*
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Michimura, Shinji; Inami, Toshiya; Otsubo, Toru*; Matsumura, Takeshi*; Tanida, Hiroshi*; Sera, Masafumi*; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*
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Michimura, Shinji; Inami, Toshiya; Otsubo, Toru*; Matsumura, Takeshi*; Tanida, Hiroshi*; Sera, Masafumi*; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*
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no abstracts in English
Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*
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no abstracts in English
Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*
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