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Co(CO
)
(HO)Matsuda, Masaaki; Wakimoto, Shuichi; Kakurai, Kazuhisa; Honda, Zentaro*; Yamada, Koji*
Physical Review B, 75(1), p.012405_1 - 012405_4, 2007/01
Times Cited Count：4 Percentile：22.63(Materials Science, Multidisciplinary)NaCo(CO)(HO) consists of two-leg ladders of Co
ions. It was reported that this is a candidate compound to show a magnetic state in the vicinity of the gapped and the N
el ordered state, where the quantum phase transition occurs. Neutron scattering experiments were performed to study the magnetic ground state of this compound. It is found that the system is well described by an almost isolated dimer model, in which dimers are formed between spins along the rung direction and the interaction along the rung direction is much larger than that along the leg direction. The intra-dimer coupling constant is determined to be 5.2 meV. Other interactions were found to be very small.
OMatsuda, Masaaki; Honda, Zentaro*
no journal, ,
We performed neutron diffraction experiments in GeFeO. It was found that the magnetic structure has the characteristic vector (
,,0) (
2/3). slightly depends on crystals, probably originating from the oxygen defficiency.
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.
Fe(CO)(HO)Matsuda, Masaaki; Honda, Zentaro*
no journal, ,
We performed neutron inelastic scattering experiments in NaFe(CO)(HO) that consists of two-leg spin ladders of Fe ions. We observed sharp magnetic excitation peaks around 
3.5 meV and 5.3 meV. This result shows that the magnetic excitations originate from almost isolated dimers, indicating that the interaction along the leg direction is negligibly small.
Matsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*; Ueda, Hiroaki*; Ueda, Yutaka*; Mitamura, Hiroyuki*; Kindo, Koichi*
no journal, ,
