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Fe
GeO
with andalusite structureKakimoto, Kazuo*; Takada, Saki*; Ota, Hiroto*; Hayaguchi, Yuya*; Hagihara, Masato; Torii, Shuki*; Kamiyama, Takashi*; Mitamura, Hiroyuki*; Tokunaga, Masashi*; Hatakeyama, Atsushi*; et al.
Journal of the Physical Society of Japan, 91(5), p.054704_1 - 054704_7, 2022/05
Times Cited Count：1 Percentile：28(Physics, Multidisciplinary)
-xGeO with 
= 0.09 and 0.15Kakimoto, Kazuo*; Ota, Hiroto*; Haraguchi, Yuya*; Hagihara, Masato; Torii, Shuki*; Kamiyama, Takashi*; Katori, Hiroko*
Journal of the Physical Society of Japan, 91(5), p.054707_1 - 054707_9, 2022/05
Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)
O
Matsuda, Masaaki; Chung, J.-H.*; Park, S.*; Sato, Taku*; Matsuno, Kenichiro*; Katori, Hiroko*; Takagi, Hidenori*; Kakurai, Kazuhisa; Kamazawa, Kazuya*; Tsunoda, Yorihiko*; et al.
Europhysics Letters, 82(3), p.37006_1 - 37006_5, 2008/05
Times Cited Count：21 Percentile：71.09(Physics, Multidisciplinary)Recently, two consecutive phase transitions were observed, upon cooling, in an antiferromagnetic spinel GeNiO at 
K and 
K, respectively. Using unpolarized and polarized elastic neutron scattering we show that the two transitions are due to the existence of frustrated minority spins in this compound. Upon cooling, at 
the spins on the 
111
kagom
planes order ferromagnetically in the plane and antiferromagnetically between the planes (phase I), leaving the spins on the 111 triangular planes that separate the kagom planes frustrated and disordered. At the lower 
, the triangular spins also order in the 111 plane (phase II). We also present a scenario involving exchange interactions that qualitatively explains the origin of the two purely magnetic phase transitions.
O in magnetic fieldMatsuda, Masaaki; Hoshi, Takemichi*; Katori, Hiroko*; Kosaka, Masashi*; Takagi, Hidenori*
no journal, ,
GeCoO has the spinel structure, in which the Co
moments with 
=3/2 are located at the corners of the tetrahedron. It shows an antiferromagnetic ordering with a characteristic wave vector of 
=(1/2, 1/2, 1/2) below 
21 K accompanied by a structural phase transition from cubic to tetragonal symmetry. This compound also exhibits a magnetic phase transition at 
4 T. Magnetic field dependence of some magnetic Bragg peak intensities was measured. For example, the (1/2, 1/2, 1/2) Bragg intensity increases with increasing magnetic field up to 4 T and gradually decreases above 4 T. This characteristic field is consistent with Hc. The field dependence of the intensity probably originates from the combined effects of the redistribution of the magnetic domains and a magnetic phase transition.
Matsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*
no journal, ,
LiCrMnO has the spinel structure, in which the Cr
and Mn
moments with =3/2 are randomly located at the corners of the tetrahedron. It shows a spin-glass behavior below 
13 K suggested from the magnetic susceptibility experiments. Our neutron scattering study shows that short-range magnetic correlations with characteristic 
0.6 and 1.6 
develop at low temperatures. The correlation with 1.6 is explained by the antiferromagnetic fluctuations originating from the hexagonal spin clusters, which is proposed in ZnCrO. We plan to perform neutron scattering experiments in magnetic field in the near future.
Cr
)OMatsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*
no journal, ,
LiCrMnO has the spinel structure, in which the Cr and Mn moments with =3/2 are randomly located at the corners of the tetrahedron. It shows a spin-glass behavior below 13 K suggested from the magnetic susceptibility experiments. Our neutron scattering study shows that short-range magnetic correlations with characteristic 0.6 and 1.6 develop at low temperatures. The correlation with 1.6 is explained by the antiferromagnetic fluctuations originating from the hexagonal spin clusters, which is proposed in ZnCrO.
Cr)OMatsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*
no journal, ,
LiCrMnO has the spinel structure, in which the Cr and Mn moments with =3/2 are randomly located at the corners of the tetrahedron. It shows a spin-glass behavior below 13 K suggested from the magnetic susceptibility experiments. Our neutron scattering study shows that short-range magnetic correlations with characteristic 0.6 and 1.6 develop at low temperatures. The correlation with 1.6 is explained by the antiferromagnetic fluctuations originating from the hexagonal spin clusters, which is proposed in ZnCrO.
Matsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*; Ueda, Hiroaki*; Ueda, Yutaka*; Mitamura, Hiroyuki*; Kindo, Koichi*
no journal, ,
