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Journal Articles

Powder neutron diffraction study of HoCoGa$$_{5}$$

Kobayashi, Riki; Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*

Journal of the Korean Physical Society, 63(3), p.337 - 340, 2013/08

https://doi.org/10.3938/jkps.63.337
 Times Cited Count：4 Percentile：33.58(Physics, Multidisciplinary)

Journal Articles

NMR determination of noncollinear antiferromagnetic structure in TbCoGa$$_5$$

Tokunaga, Yo; Saito, Yo*; Sakai, Hironori; Kambe, Shinsaku; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kawasaki, Yu*; Kishimoto, Yutaka*

Physical Review B, 84(21), p.214403_1 - 214403_7, 2011/12

https://doi.org/10.1103/PhysRevB.84.214403
 Times Cited Count：8 Percentile：36.09(Materials Science, Multidisciplinary)

We report NMR studies of TbCoGa$$_5$$, which has the tetragonal HoCoGa$$_5$$ structure and exhibits two antiferromagnetic (AF) transitions at $$T_{rm N1}$$=36.2 K and $$T_{rm N2}$$=5.4 K. From a symmetry analysis of internal magnetic fields at orthorhombic Ga sites, we have successfully determined the magnetic structures in the AF-I ($$T_{rm N2}<T<T_{rm N1}$$) and AF-II ($$T<T_{rm N2}$$) phases. The AF-I phase is a collinear AF order with a propagation vector $$q=[1/2, 0, 1/2]$$ and ordered moments parallel to the [001] direction. In the AF-II phase, on the other hand, we found a non-collinear AF structure described by double propagation vectors $$q_1=[1/2, 0, 1/2]$$ and $$q_{2}=[0, 1/2, 1/2]$$, where the moments tilt away from the [001] direction toward [100], keeping a constant value along the [001] direction. In the context of these results we discuss the possible presence of magnetic frustration in this system.

Oral presentation

Resonant X-ray diffraction study of successive magnetic orderings of rectangular components in TbCoGa$$_5$$

Michimura, Shinji; Inami, Toshiya; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*

no journal, , 

no abstracts in English

Oral presentation

Neutron scattering study on successive transitions in TbCoGa$$_5$$

Kaneko, Koji; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Osakabe, Toyotaka

no journal, , 

no abstracts in English

Oral presentation

Non-collinear antiferromagnetic structure in TbCoGa$$_5$$

Tokunaga, Yo; Saito, Yo*; Sakai, Hironori; Kambe, Shinsaku; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kawasaki, Yu*; Kishimoto, Yutaka*

no journal, , 

We report NMR studies of TbCoGa$$_5$$, which has the tetragonal HoCoGa$$_5$$ structure and exhibits two antiferromagnetic (AF) transitions at $$T_{N1}$$=36.2 K and $$T_{N2}$$=5.4 K. From analysis of the internal fields at Ga sites, we have determined the magnetic structures of the AF-I ($$T_{N2}<T<T_{N1}$$) and the AF-II ($$T<T_{N2}$$) phases. The AF-I phase is a collinear AF order with the propagation vector q=[1/2, 0, 1/2] and with ordered moments parallel to the c axis. This is in accordance with the neutron diffraction measurements. In the AF-II phase, on the other hand, we found a non-collinear AF structure described with double propagation vectors $$q_1$$=[1/2, 0, 1/2] and $$q_2$$=[0, 1/2, 1/2]. Interestingly, the NMR reveals that the c component of the Tb moments does not change value between the AF-I and the AF-II phases, even though an a component is newly developed in the AF-II phase.

Oral presentation

Magnetic structure of RCoGa$$_5$$ (R=Tb, Ho)

Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kobayashi, Riki

no journal, , 

no abstracts in English

Oral presentation

Magnetic structure of $$R$$CoGa$$_{5}$$ ($$R$$=Tb, Dy, Ho)

Kobayashi, Riki; Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*

no journal, , 

no abstracts in English

Oral presentation

Magnetic structure analyses of RCoGa$$_{5}$$ (R=Tb, Dy, Ho) by single crystal neutron diffractometer SENJU

Kawasaki, Takuro; Kaneko, Koji; Watanuki, Ryuta*; Sanada, Naoyuki*; Suzuki, Kazuya*; Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; Tamura, Itaru; Nakao, Akiko*; et al.

no journal, , 

no abstracts in English

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