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Journal Articles

High-pressure studies of DyB$$_2$$C$$_2$$

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:1 Percentile:12.72(Physics, Multidisciplinary)

Journal Articles

Resonant X-ray diffraction study of multipole ordering in the ferromagnetic compound CePd$$_3$$S$$_4$$

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:35.45(Physics, Multidisciplinary)

Resonant X-ray diffraction experiments on CePd$$_3$$S$$_4$$ were performed at the Ce-$$L$$$$_{3}$$ absorption edge to study the states of quadrupolar ordering below the ferromagnetic transition temperature $$T_{rm C}$$ = 6.3 K. The magnetic structure of CePd$$_3$$S$$_4$$ was reported as a canted ferromagnetic structure with a canting angle of 51$$^circ$$. 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 $$pi$$-$$pi$$' and $$pi$$-$$sigma$$' scattering processes. The results revealed that $$O$$$$_2$$$$^{0}$$-type antiferroquadrupolar ordering coexists with magnetic ordering. We infer that the magnetic structure of CePd$$_3$$S$$_4$$ is not a canted structure but a ferrimagnetic structure and that the quadrupole moment is also a primary-order parameter.

Journal Articles

Pressure effects on quadrupolar and magnetic ordering in HoB$$_2$$C$$_2$$ observed by single-crystal neutron diffraction

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:9 Percentile:55.77(Physics, Multidisciplinary)

High-pressure single-crystal neutron diffraction experiments were carried out on a tetragonal HoB$$_2$$C$$_2$$ where the antiferroquadrupolar (AFQ) order coexists with the antiferromagnetic (AFM) order competitively. The transition temperature $$T$$$$_{rm N}$$ increases monotonically with increasing pressure up to 9.8 GPa, whereas $$T$$$$_{rm Q}$$ 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.

Journal Articles

Resonant X-ray magnetic diffraction experiments on SmB$$_2$$C$$_2$$

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 SmB$$_2$$C$$_2$$ at $$T_{rm N2}$$=37K and $$T_{rm N1}$$=51K by means of resonant X-ray diffraction. Strong resonant diffraction signal is observed at the 101 reflection below $$T_{rm N2}$$ at the Sm $$L_3$$ edge, whereas in the intermediate phase signals appear at incommensurate positions $${vec Q}$$=(1$$pmdelta$$, $$pmdelta$$,1) where $$delta$$=0.13. Accordingly, the successive phase transitions in SmB$$_2$$C$$_2$$ is found to be commensurate-to-incommensurate magnetic phase transitions.

Journal Articles

Anisotropy in magnetic phase diagram of TbB$$_2$$C$$_2$$ with field-induced antiferroquadrupolar order

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:38.35(Physics, Multidisciplinary)

The field-direction dependence of the magnetic phase diagram was examined for the compound TbB$$_2$$C$$_2$$ with field-induced antiferroquadrupolar-ordering, in order to elucidate anisotropy in the magnetic phase diagrams for $$H{parallel}$$[100] and $$H{parallel}$$[110]. The field-induced phase for $$H{parallel}$$[100] (phase III), which is a phase in which antiferromagnetic (AFM) and antiferroquadrupolar (AFQ) orders coexist, seems to change continuously into the other (AFQ$$+$$AFM) phase (phase II') for $$H{parallel}$$[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.

Journal Articles

Unusual antiferromagnetic properties affected by antiferroquadrupolar interaction in TbB$$_{2}$$C$$_{2}$$

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

Journal Articles

Quadrupole and hexadecapole ordering in DyB$$_2$$C$$_2$$; Direct observation with resonant X-ray diffraction

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:35 Percentile:80.32(Materials Science, Multidisciplinary)

Direct evidence of the spatial ordering of Dy 4$$f$$ quadrupole and hexadecapole moments in DyB$$_2$$C$$_2$$ is demonstrated by resonant X-ray diffraction enhanced by an electric quadrupole event ($$E$$2 resonance) at the Dy L$$_{III}$$ absorption edge. The diffraction data show that the structural phase transition at $$T$$$$_{Q}$$ = 24.7 K is accompanied by a reduction in the symmetry of the Dy site to 2/$$m$$, from 4/$$m$$, and the spatial ordering of the time-even Dy multipoles with A$$_{g}$$ character. Below $$T$$$$_{Q}$$ the crystal structure is described by the space group $$P$$4$$_2$$/$$mnm$$ and Dy ions occupy sites (4$$c$$). The distortion at T$$_{Q}$$ 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/$$m$$. 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.

Journal Articles

Long periodic magnetic structure in CeB$$_2$$C$$_2$$

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:44.06(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic properties of tetragonal Ce$$_{1-x}$$Lu$$_x$$B$$_2$$C$$_2$$(0$$<$$x$$<$$0.31) compounds

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:13.16(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Resonant X-ray diffraction study of a multipole ordering in CePd$$_3$$S$$_4$$

Michimura, Shinji; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*

no journal, , 

no abstracts in English

Oral presentation

Resonant X-ray diffraction study of multipole ordering in CePd$$_3$$S$$_4$$

Michimura, Shinji; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Onodera, Hideya*

no journal, , 

Oral presentation

High pressure effects in HoB$$_2$$C$$_2$$ studied by single-crystal neutron diffraction

Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*

no journal, , 

no abstracts in English

Oral presentation

Pressure effects on HoB$$_2$$C$$_2$$ studied by neutron single-crystal diffraction

Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*

no journal, , 

no abstracts in English

Oral presentation

High pressure study on quadrupolar and magnetic order in HoB$$_2$$C$$_2$$ by means of neutron single-crystal diffraction

Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*

no journal, , 

Oral presentation

Resonant X-ray diffraction study of multipole ordering in DyPd$$_3$$S$$_4$$

Michimura, Shinji; Inami, Toshiya; Otsubo, Toru*; Matsumura, Takeshi*; Tanida, Hiroshi*; Sera, Masafumi*; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*

no journal, , 

Oral presentation

Study of a multipole ordering in DyPd$$_3$$S$$_4$$ by a resonant X-ray diffraction

Michimura, Shinji; Inami, Toshiya; Otsubo, Toru*; Matsumura, Takeshi*; Tanida, Hiroshi*; Sera, Masafumi*; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*

no journal, , 

no abstracts in English

Oral presentation

Pressure effects on antiferroquadrupolar order in RB$$_2$$C$$_2$$ (R = Dy, Ho)

Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*

no journal, , 

no abstracts in English

Oral presentation

Magnetic properties of HoB$$_2$$C$$_2$$ under high pressure; A Single-crystal neutron diffraction study

Yamauchi, Hiroki; Osakabe, Toyotaka; Matsuoka, Eiichi*; Onodera, Hideya*

no journal, , 

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